zsm-5 zeolites prepared: Topics by WorldWideScience.org

Catalyst and method for reduction of nitrogen oxides

A Selective Catalytic Reduction (SCR) catalyst was prepared by slurry coating ZSM-5 zeolite onto a cordierite monolith, then subliming an iron salt onto the zeolite, calcining the monolith, and then dipping the monolith either into an aqueous solution of manganese nitrate and cerium nitrate and then calcining, or by similar treatment with separate solutions of manganese nitrate and cerium nitrate. The supported catalyst containing iron, manganese, and cerium showed 80 percent conversion at 113 degrees Celsius of a feed gas containing nitrogen oxides having 4 parts NO to one part NO.sub.2, about one equivalent ammonia, and excess oxygen; conversion improved to 94 percent at 147 degrees Celsius. N.sub.2O was not detected (detection limit: 0.6 percent N.sub.2O).

2008-08-19

3

Kinetics and FTIR studies of hydrocarbon synthesis on Pd/ZSM5 catalysts. Final report

A Selective Catalytic Reduction (SCR) catalyst was prepared by slurry coating ZSM-5 zeolite onto a cordierite monolith, then subliming an iron salt onto the zeolite, calcining the monolith, and then dipping the monolith either into an aqueous solution of manganese nitrate and cerium nitrate and then calcining, or by similar treatment with separate solutions of manganese nitrate and cerium nitrate. The supported catalyst containing iron, manganese, and cerium showed 80 percent conversion at 113 degrees Celsius of a feed gas containing nitrogen oxides having 4 parts NO to one part NO.sub.2, about one equivalent ammonia, and excess oxygen; conversion improved to 94 percent at 147 degrees Celsius. N.sub.2O was not detected (detection limit: 0.6 percent N.sub.2O).

2008-05-27

4

Pyrolysis of spill oils adsorbed on zeolites with product oils recycling

Hydrocarbon synthesis during CO hydrogenation over Pd/M-ZSM5 (M=H,Na,La) and Pd/SiO/sub 2/ has been investigated. Overall activity depended on the cation-exchanged form of the support and decreased in the order Pd/La-ZSM5 = Pd/Na-ZSM5 > Pd/H-ZSM5 > Pd/SiO/sub 2/. The zeolite-supported catalysts showed high selectivity towards saturated C/sub 2/-C/sub 6/ hydrocarbons, whereas Pd/SiO/sub 2/ favored methanol production. Increasing temperature and H/sub 2//CO feed ratio led to higher reaction rates, lower yields of C/sub 2/-C/sub 6/ products, and increased lighter hydrocarbons. A mechanical mixture of Pd/SiO/sub 2/ and Na-ZSM5 showed similar product distribution as Pd/Na-ZSM5. Infrared spectra of the catalysts under ...

1986-10-15

5

Characterization of acid sites in pentasil zeolites by x-ray photolectron spectroscopy

Experimentally, a feasibility study for adsorption and catalytic pyrolysis of spill oils on Cu/ZSM-5 for recycling of light oils has been conducted in the present work. The adsorption and pyrolysis of model compounds such as heptane, toluene, and diesel (to stimulate the spill oils) on Cu/ZSM-5 have been investigated on a continuous fixed-bed reactor. By component fitted X-ray absorption near edge structural (XANES) spectroscopy, catalytic active species such as metallic copper (Cu) (77-84%) and Cu2O (6-7%) are found in the channels of ZSM-5 during pyrolysis of heptane or toluene. Pyrolysis of diesel effected by Cu/ZSM-5 yields gas (C1-C5) (32%) and light oil (68%) that can be used as auxiliary fuels.

2007-06-03

6

The mechanisms of ethene and propene formation from methanol over high silica H-ZSM-5 and H-beta

The N{sub 1s} XPS band of pyridine chemisorbed on Al-ZSM-5 zeolite was found to be properly deconvoluted into three component peaks. In a previous contribution these three components were assigned to pyridine chemisorbed on two kinds of Bronsted acid sites and one Lewis acid site. This analysis is extended here to Fe-ZSM-5 and B-ZSM-5. Isomorphous substitution of Fe for Si or Al in the zeolite framework leads to a slight decrease in the binding energy of the N{sub 1s} Lewis component. In the case of B substitution a decrease in the binding energy of all three N{sub 1s} components is observed.

1990-11-01

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British Library Electronic Table of Contents (United Kingdom)

Selectivity control is a key issue in the zeolite facilitated conversion of methanol to hydrocarbons. This work addresses: (a) How the zeolite topology (MFI versus BEA) determines the type of intermediate participating in the catalytic cycle thereby controlling the ethene/propene product selectivity in the methanol to alkenes reaction, and (b) to what extent light alkene formation occurs via aromatic and alkene reaction intermediates for H-ZSM-5. Three catalyst samples have been studied in experiments relying on isotopic labeling. For H-beta, penta- and hexamethylbenzene are involved in an aromatics based hydrocarbon pool type mechanism leading predominantly to propene and the higher alkenes (a very low yield of ethene is observed), whereas for H-ZSM-5, the lower methylbenzenes are the aro...

2009-01-01

8

Magic-angle-spinning NMR studies of acid sites in zeolite H-ZSM-5

Zeolite-supported Ni and Mo catalysts for hydrotreatments. 2. HRTEM observations

{sup 1}H, {sup 13}C, {sup 27}Al, and {sup 29}Si magic-angle-spinning (MAS) NMR was used to elucidate the nature of the catalytic activity of zeolite H-ZSM-5. {sup 1}H MAS NMR of sealed samples after mild hydrothermal dealumination shows that the enhanced activity for n-hexane cracking is not due to an enhanced Bronstead acidity. The concentrations of the various OH groups and aluminous species suggest that the reason for the enhanced catalytic activity is the interaction of the n-hexane molecule with a bridging hydroxyl group and with extra-framework aluminium species, which give rise to the enhanced activity, cannot be easily removed from their positions, and are therefore immobilized by the zeolitic framework.

1991-01-01

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Mechanism of dehydroxylation of naturally occurring high-silica zeolites involving the formation of Lewis acid sites

Calcined and sulfided Ni-Mo catalysts supported on ultrastable Y zeolite (USY), NaY zeolite, mordenite, and ZSM-5 were studied by high-resolution electron transmission microscopy (HRTEM) with selected-area electron diffraction (SAED) and energy-dispersive spectroscopy (EDS). Ni and Mo oxide aggregates were rarely observed in the USY-supported Ni-Mo catalyst, indicating that most of Ni and Mo may be incorporated into USY, e.g., supercavities and possibly sodalite cages. However, there were a large number of {alpha}-NiMoO{sub 4} aggregates of different particle sizes in NaY-, mordenite-, and ZSM-5-supported catalysts, and the mordenite-supported catalyst also contained MoO{sub 3} crystals. The {alpha}-NiMoO{sub 4} may be attached to the surface of substrates as individual particles or needle aggregates, it may be disseminated into mordenite particles, or it may ...

2000-01-25

10

Studies on the acidity of mordenite and ZSM-5. 2. Loss of Broensted acidity by dehydroxylation and dealumination

Using low-temperature adsorbed dihydrogen and carbon monoxide as molecular probes, the dehydroxylation of the hydrogen forms of the zeolites Y, and ZSM-5 has been studied. The high stability of the high-silica zeolites to dealumination and their difference from faujasites has been established as being due not only to the strength of their Broensted acid sites but also to the nature of their Lewis acid sites. The chemical properties of the Lewis acid sites and their possible role in catalytic reactions are discussed.

1987-11-01

11

Bactericidal effects of different silver-containing materials

Quantitative determination of Broensted acid site concentrations in calcined H-mordenite and H-ZSM-5 by means of conductometric titration and infrared spectroscopy reveals that the concentration of Broensted acid sites present is lower than would be expected on the basis of the aluminum content. This discrepancy is attributed to dealumination and dehydroxylation processes occurring during calcination. A model is proposed according to which the degree of these processes strongly depends on the concentration of vicinal aluminum T sites in the zeolite: Broensted acid sites associated with these T sites are lost, and the remaining Broensted acidity is related to the concentration of the (remaining) isolated aluminum T sites. This model quantitatively correlates the experimentally determined concentration of Broensted acid sites with the concentration of isolated aluminum T sites. 33 refs., 4 figs., 2 tabs.

1993-01-14

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British Library Electronic Table of Contents (United Kingdom)

The evaluation of the bactericidal effect of different silver-containing materials where silver is available as Ag^+ (silver nitrate and different silver-exchanged zeolites), as metallic Ag^0 (commercial silver nanoparticles) or as oxide (silver (I) oxide) was carried out in order to elucidate the importance of the bioavailability of silver (i.e., as free ions, metallic particles, combination of them, clusters, complexes, partially soluble or insoluble salts, etc.) on its bactericidal action. For the different materials tested, their bactericidal effect is ordered in the following sequence: AgNO"3>Ag-ZSM-5>Ag"2O>commercial silver-exchanged zeolite (granular)>commercial silver-exchanged zeolite (pellets)>Ag nanoparticles. In general, as the content of bioavailable ionic silver increases, th...

2011-01-01

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Analysis of active site distribution in ZSM-5 crystals by infrared microscopy

FT-IR spectroscopic studies of hydrocarbon trapping in Ag{sup +}-ZSM-5 for gasoline engines under cold-start conditions

The acid site distribution over large ZSM-5 crystals was analyzed using FTIR microscopy. Results of the analysis of the OH-stretching vibrations and of vibrations of pyridine adsorbed on Bronsted and Lewis acid sites were found to be in good agreement. The resolution which can be obtained using this novel technique is about 10-20 [mu]m. This limits the application to large crystals as analyzed in this study. Comparison of the results of IR microscopy with aluminum distributions obtained by electron microprobe analysis revealed that IR microscopy cannot resolve inhomogeneities on a scale smaller than the above-state limits. The results of both methods on a larger scale, however, are in very good agreement. Using a combination of both techniques, it is possible to obtain a clearer picture of the distribution of acid sites in large zeolite crystals, where electron microprobing gives the higher resolution, and IR microscopy ...

1993-10-01

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Acid catalysis over CuY zeolites

A detailed study of adsorption of automobile exhaust hydrocarbons in Ag{sup +}-exchanged zeolites under cold-start conditions (room temperature and in the presence of water) was carried out with FT-IR spectroscopy, using toluene and propylene as probes. The results show that exchanged Ag{sup +} in zeolites is unique for trapping olefin and aromatic hydrocarbons due to its resistance to water adsorption. In contrast, exchanged Cu{sup 2+} in zeolites, which has good hydrocarbon trapping properties under dry conditions, does not trap hydrocarbons under wet conditions. Here, solvation of Cu{sup 2+} screens the interactions of the cation with adsorbed hydrocarbons. The results also show that, in addition to the nature of the cation, the structure of the zeolite also plays a role in hydrocarbon trapping. Aging at high temperatures, with water vapor (=10%) and SO{sub 2} (=15ppm), leads to a decrease of the ...

2001-12-28

15

Characterization of systems active in selective catalytic reduction of NO{sub x}

Recently there has been considerable interest in the Cu-ZSM-5 catalysts for the selective reduction of NO by light hydrocarbons for the purpose of atmospheric pollution abatement. Isobutane and n-pentane cracking were studied over Cu zeolite catalysts and these results were compared with their HY analogues at low conversions and at temperatures of 673 K and below. Three forms of the catalysts were used: those reduced in CO at 773 K; those reduced with H[sub 2] at 473 K; and those in the oxidic form (following flushing with He at 773 K). In contrast with an earlier publication, very little difference in activity was found between the two reduced forms of the catalysts did not differ significantly from each other nor from the H-form of the zeolite. They are typical of a Bronsted acid catalysis. The oxidic form of the catalyst produced excess H[sub 2] in increasing amounts with time on stream. This could ...

1993-06-01

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Session 6: Effect of Zeolite Supported Catalysts on the Decomposition of Pyridine

This thesis is in the field of gas emission control from automobile and stationary sources. Out of the possible approaches to the elimination of pollutant gases, such as nitrogen oxides (NO{sub x}), one consists in the selective catalytic reduction (SCR) of these NO{sub x} on a suitable heterogeneous catalyst. Ammonia or hydrocarbons are employed as reducing agents. The most important catalysts active in the SCR of NO{sub x} are based on ions of transition metal either supported on several oxides or dispersed in zeolites. The catalysts have been characterized by electron magnetic resonance techniques (EPR, ENDOR, ESEEM) and the interaction of catalysts with nitrogen oxides, with reducing and poisoned agents have been followed with the same techniques. Copper dispersed on alumina and its interaction with both NO and ammonia has been investigated. Also the interaction between both water and ammonia with copper dispersed in zeolite ...

1998-06-01

17

Phenol by direct hydroxylation of benzene with nitrous oxide - role of surface oxygen species in the reaction pathways

The aim of this work is to test the catalytic oxidation of pyridine over zeolite-supported catalysts and to compare the difference in their activities for the oxidation of pyridine. The catalytic oxidation of pyridine pollutant on a series of copper-supported catalysts, inclusive of Cu/beta, Cu/ZSM-5, Cu/MCM-41 and Cu/{gamma}-Al{sub 2}O{sub 3}, in the presence of excess oxygen was studied. The activity of the copper-supported catalysts for the pyridine oxidation could be correlated with the binding energy of oxygen coordinated to metal copper, while the ability to control the yield of NO{sub x} appeared to be strongly dependent on the binding energy of NO bonded to metal copper. On these catalysts, two copper species, Cu(H{sub 2}O){sub 6}{sup 2+} ions and CuO were identified, in which Cu{sup 2+} ions had higher activity for the NO{sub x} control but poorer activity for the pyridine oxidation. Amongst those metals-supported ...

2004-07-01

18

Catalysis over activated zeolites

Transient experiments in a Temporal Analysis of Products (TAP) Reactor were performed to elucidate the role of surface oyxgen species in the oxidation of benzene to phenol on ZSM-5 type zeolites with nitrous oxide as a selective oxidant. It was shown by puls experiments with nitrous oxide that the mean lifetime of the generated surface oxygen species is between 0.2s at 500 C and about 4.2 s at 400 C. Afterwards the surface oxygen species desorb as molecular oxygen into the gas phase where total oxidation will take place if hydrocarbons are present. Dual puls experiments consisting of a nitrous oxide puls followed by a benzene puls allowed studying the reactivity of the surface oxygen species formed during the first puls. The observation of the phenol formation was impeded due to the strong sorption of phenol. Multipulse experiments were necessary to reach a pseudo steady state phenol yield. (orig.)

1998-12-31

19

Removal of Cr(III) from aqueous solutions using zeolite NaY prepared from rice husk ash

A process is provided for conducting organic compound conversion over a catalyst composition comprising a supported crystalline zeolite having a high initial silica-to-alumina mole ratio, said supported zeolite being prepared by compositing said crystalline zeolite with alumina, reacting the composite with a particular hydrogen fluoride solution in a specified way, drying the hydrogen fluoride reacted composite, treating the dried composite by hydrolysis, ammonolysis and/or by contact with an ammonium salt solution, and calcining the resulting material.

1985-02-19

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State of molybdenum ions in ultrastable Y zeolite

The efficiency of the synthesized zeolite NaY from rice husk ash (RHA) in the removal of Cr(III) from aqueous solution was studied. Zeolite NaY was synthesized from RHA via seeding technique and the identification of its structure was done by X-ray Diffraction (XRD) technique and the elemental analysis was carried out by X-ray Fluorescence (XRF). The physicochemical properties which were related to the use of the zeolite NaY as a sorbent was also investigated. The synthesized zeolite NaY has higher cation exchange capacity (CEC) than the commercial zeolite NaY due to the higher amount of sodium content in the synthesized as well as the lower ratio of silica to alumina. The synthesized zeolite NaY together with the commercial one as comparison was used in the sorption of the Cr(III) in aqueous solution by batch sorption experiments. The kinetic study showed that ...

2007-01-01

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Change in the chemical composition and surface properties of high-silica zeolites in activating treatments and during a catalytic reaction

The methods of diffuse-reflection optical spectroscopy and EPR were used to study the state of molybdenum in catalysts prepared by impregnating ultrastable zeolite with molybdenum salt solutions and by mixing in the solid phase with MoCl/sub 5/. It has been shown that molybdenum introduced into zeolites in small amounts is found basically in the form of isolated hexavalent ions of molybdenum. In addition, Mo/sup 5 +/ and Mo/sup 4 +/ ions are also present. Heteropolycompounds also form. The molybdenum ions are most readily reduced in the zeolite prepared by impregnation with a solution of ammonium paramolybdate.

1987-10-01

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Method of preparation of crystal borophosphate with zeolite structure. Sposob polucheniya kristallicheskogo borofosfata tseolitnoj struktury

The surface composition and composition near the surface and properties of high-silica zeolites of the TsVK-1 type were studied by XPES, IRS, and low-temperature adsorption of N/sub 2/. It was found that changing the sequence of operations during preparation of the H form of the zeolites results in a different set of acid centers on their surface, caused by migration of cations into the bulk of the zeolites. Migration of elements is also observed during the catalytic reaction of conversion of ethanol.

1988-08-01

23

Ni/CeO{sub 2}/ZSM-5 catalysts for the production of hydrogen from the pyrolysis-gasification of polypropylene

Hydrothermal method for preparing crystal borophosphate with zeolite structure is suggested. To increase absorption capacity and thermal stability of final product, aluminium hydroxide sol, ethylenediamine and ethyl acetate are added to the mixture of crystal boric and concentrated phosphoric acids. Thermal stability of the specimens prepared constitutes 880-950 deg, water absorption capacity is within the limits of 0.30-0.32 cmT/g. 1 table.

1984-12-24

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Secondary reactions during CO hydrogenation on zeolite-supported metal catalysts: influence of alkali cations

The production of hydrogen from the two-stage pyrolysis-gasification of polypropylene using a Ni/CeO{sub 2}/ZSM-5 catalyst has been investigated. Experiments were conducted on CeO{sub 2} loading, calcination temperature and Ni loading of the Ni/CeO{sub 2}/ZSM-5 catalyst in relation to hydrogen production. The results indicated that with increasing CeO{sub 2} loading from 5 to 30 wt.% for the 10 wt.% Ni/CeO{sub 2}/ZSM-5 catalyst calcined at 750 C, hydrogen concentration in the gas product and the theoretical potential hydrogen production were decreased from 63.0 to 49.8 vol.% and 50.4 to 21.6 wt.%, respectively. In addition, the amount of coke deposited on the catalyst was reduced from 9.5 to 6.2 wt.%. The calcination temperature had little influence on hydrogen production for the catalyst containing 5 wt.% of CeO{sub 2}. However, for the 10 wt.% Ni/CeO{sub ...

2009-08-15

25

Development of heavy oil hydrocracking catalysts using amorphous silica-alumina and zeolites as catalyst supports

The effect of neutralizing cations on the secondary reactions of the primary products from CO hydrogenation over ion-exchanged zeolite-supported Ru catalysts was investigated using zeolites with different alkali cations (Li/sup +/, Na/sup +/, K/sup +/, Rb/sup +/, Cs/sup +/). The transformation of olefins (propylene and butene) on the zeolites without the metal, under conditions similar to those used for CO hydrogenation, was also studied in order to understand the effect of the various constituents of the support, i.e., the Broensted acid sites generated during catalyst preparation and the alkali cations, on possible secondary reactions of the primary olefinic products. It was established that secondary acid-catalyzed reactions of these primary products can play a major role in shaping product selectivity during CO hydrogenation over zeolite-supported catalysts. Depending on the ...

1987-10-01

26

Acidity of H-Y zeolites: Role of extralattice aluminum

The overall objective of this research work was to prepare hydrocracking catalysts using amorphous silica-alumina (ASA) supports in combination with USY and {beta}-zeolites. Three supports: namely silica-alumina, USY and {beta}-zeolites were selected to prepare the extrudates using AP-1 as a binder, while two metal pairs: namely Ni-W and Ni-Mo were loaded on the extrudates through co-impregnation using incipient wetness technique. The catalysts were then calcined at 550C for 2h. The catalysts were tested in a fixed-bed flow reaction system for their activity, using desulfurized vacuum gas oil (DS-VGO) as a feedstock. The catalytic evaluation results of the catalysts showed that {beta}-zeolite alone and in combination with the ASA used in this study, has a potential as a support for developing heavy oil hydrocracking catalysts. A balance of weak and strong acidities of ...

2002-07-10

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Resonance Raman and photophysical studies of transition metal complexes in solution and entrapped in zeolites

The nature of extralattice aluminum and its effect on acidity in zeolites was studied. A series of zeolites (some commercial), dealuminated by various methods, were obtained having Si/Al ratios between 1.5 and 20. These were characterized using volumetric sorption, XRD, AA, NMR, and reaction studies. Samples dealuminated using ammonium hexafluorosilicate were found to contain little or no extralattice aluminum. In contrast, steam-dealuminated zeolites had large amounts of extralattice aluminum. In some cases a significant portion of the extralattice aluminum was unobservable by [sup 27]Al NMR, suggesting the existence of an aluminum species of low symmetry. Proton NMR indicated that all the protons were associated with the lattice aluminum atoms. Depending on the preparation history, different groups of H-Y zeolites exhibited different maxima in catalytic activity as a function of ...

1993-02-01

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Inorganic molecular sieves: Preparation, modification and industrial application in catalytic processes

We have obtained convincing evidence for localization of the optical electron on a single-ring fragment of a chelated bipyridine-like'' ligand (ie., pyridylpyrazine or 4-Methyl-bipyridine). In addition we have completed studies of Ru(bipyrazine){sub 3}{sup 2+} in aqueous sulfuric acid (0--98% by weight) and find clear evidence for sequential addition of six-protons to the six peripheral nitrogen atoms. Studies of zeolite-entrapped complexes are continuing and a series of homo- and heteroleptic complexes have been prepared and characterized. Finally, the synthesis of zeolite-entrapped metallophthalocyanines has now been developed and the copper and cobalt analogues synthesized. The characterization of these materials is now in progress.

1992-03-31

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British Library Electronic Table of Contents (United Kingdom)

The increasing environmental concern and promotion of ''green processes'' are forcing the substitution of traditional acid and base homogeneous catalysts by solid ones. Among these heterogeneous catalysts, zeolites and zeotypes can be considered as real ''green'' catalysts, due to their benign nature from an environmental point of view. The importance of these inorganic molecular sieves within the field of heterogeneous catalysis relies not only on their microporous structure and the related shape selectivity, but also on the flexibility of their chemical composition. Modification of the zeolite framework composition results in materials with acidic, basic or redox properties, whereas multifunctional catalysts can be obtained by introducing metals by ion exchange or impregnation procedures...

2011-01-01

30

Assessing the acid properties of desilicated ZSM-5 by FTIR using CO and 2,4,6-trimethylpyridine (collidine) as molecular probes

British Library Electronic Table of Contents (United Kingdom)

A series of desilicated ZSM-5 catalysts previously shown to have improved catalytic performance in the MTG (methanol-to-gasoline) reaction [M. Bjorgen, F. Joensen, M.S. Holm, U. Olsbye, K.-P. Lillerud, S. Svelle, Appl. Catal. A 345 (2008) 43] was subjected to thorough examination using FTIR. Clearly, defects represented by internal Si-OH sites are removed upon NaOH treatment. In a parallel manner, free Si-OH sites increase in concentration and the results point to a selective mechanism for formation of mesopores as the framework dissolution preferentially takes place at defective sites in the crystallites. The acid properties of the desilicated materials were investigated by applying CO and collidine (2,4,6-trimethylpyridine) as molecular probes. Monitoring the induced frequency shifts upo...

2009-01-01

31

New horizons of zeolite supported catalysts

Homocytotropic antibodies (IgE) to Neisseria gonorrhoeae in the rat and a cross-reactivity of heterologous gonococcal strains.

This paper reports on the superiority of zeolites over amorphous solids which is well documented for solid acid catalysts of industrial use. Crystalline supports, likewise, open attractive perspectives for catalysis by metals, alloys, and ligated metal clusters. Size and location of clusters can be controlled by careful design of the preparation conditions. Pore dimensions control the access of reactants to active sites and escape paths for products. Cage dimensions determine which transition states can be attained; window apertures are functional in isolating metal clusters from each other, thus preventing ther coalescence and growth. The ship-in-a-bottle method permits deisgn of fairly large active complexes entrapped in zeolite cages. Orientation of non-spherical molecules in a zeolite proe helps to direct their collision with a metal particle to the head on mode; however, isolated Pt atoms hidden in ...

1992-04-05

32

Development of a stable cobalt-ruthenium Fisher-Tropsch catalyst. Final report

Outbred Wistar rats were immunised with a single intraperitoneal injection of a mixture of 30 mg of A1(OH)3 and 100microng of gonococcal zeolite antigen (ZA). Ten days after immunisation, ZA prepared...Full Text Available

1977-04-01

33

Catalytic behavior of Co/(Nanob-Zeolite) bifunctional catalysts for Fischer-Tropsch reactions

The reverse micelle catalyst preparation method has been used to prepare catalysts on four supports: magnesium oxide, carbon, alumina- titania and steamed Y zeolite. These catalysts were not as active as a reference catalyst prepared during previous contracts to Union Carbide Corp. This catalyst was supported on steamed Y zerolite support and was impregnated by a pore-filling method using a nonaqueous solvent. Additional catalysts were prepared via pore- filling impregnation of steamed Y zeolites. These catalysts had levels of cobalt two to three and a half times as high as the original Union Carbide catalyst. On a catalyst volume basis they were much more active than the previous catalyst; on an atom by atom basis the cobalt was about of the same activity, i.e., the high cobalt catalysts` cobalt atoms were not extensively covered over and deactivated by other ...

1995-02-01

34

British Library Electronic Table of Contents (United Kingdom)

Cobalt supported on Beta zeolite catalysts were prepared by impregnation of metal salts in aqueous solution and were tested for the Fischer Tropsch reaction. The support consisted of a Beta zeolite composed by crystallites of nanometric dimensions and a SiO2/Al2O3 molar ratio of about 50. This support was impregnated with Co(NO3)2 aqueous solution using different metal loads of 7.5, 10, 15 and 20wt% Co. These materials were characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), N2 adsorption (BET), thermal programmed reduction (TPR) and FTIR of adsorbed pyridine (i.e., surface acid sites distribution). All the catalysts showed a significant catalytic activity for the F-T reaction from synthesis gas (CO+2H2), in a continuous fixed bed reactor sys...

2011-01-01

35

Treatment of Artificial Sewage Using a Zeolite Column

Recovery of nitrogen oxides as nitric acid by mineral zeolite

Full Text Available

2002-09-01

36

Development of a stable cobalt-ruthenium Fischer-Tropsch catalyst. Technical progress report No. 17, 1 November 1993--31 December 1993

Short communication.

1992-06-01

37

Simultaneous SO{sub 2}/NO{sub x} abatement using zeolite-supported copper. Progress report, October 1, 1995--September 30, 1996

Very high cobalt catalysts have been prepared on steamed and acid-washed y zeolite. These catalysts are very active. Some of them have proven to be very stable. Additionally, if provisions are made to control the temperature build up on the catalyst bed, low methane selectivities result. Additional work is indicated, for instance, perhaps even higher activity catalysts can result from higher levels of cobalt or changes in the catalyst preparation procedure. Since the issue of whether small amounts of ruthenium can promote the catalyst is not completely resolved, catalyst preparation procedure experiments should continue with ruthenium vs. ruthenium-free catalysts. For instance, different methods of impregnation and/or activation should be investigated.

1994-06-01

38

Synthesis of nanoporous carbon as a gas adsorbent by reverse replication process of silica template

The bulk of the results from this project, besides being found in the research reports, are in the form of two theses presented for advanced degrees by two different students at two different institutions. Francis E. Porbeni is a Master`s Degree student in Chemistry at Clark Atlanta University and has prepared his Master`s Thesis entitled Simultaneous SO{sub 2} Oxidation and NO Decomposition over Copper Oxide on {gamma}-Alumina Catalysts: An Infrared Diffuse Reflectance Study. Sumit Rao, a Ph.D. student in Chemical Engineering at the Georgia Institute of Technology has defended his thesis entitled Role of Copper Ensemble Size in Silica and Zeolite Supported Catalysts for Nitric Oxide Decomposition. These two documents, which will be forwarded when final copies are available, provide the details of the bulk of the research accomplished over the duration of this project. These two documents are summarized, and other results from the project are ...

1996-12-31

39

CERAMIC MEMBRANES FOR HYDROGEN PRODUCTION FROM COAL

Porous carbon with high surface area and pore volume was prepared by a reverse replication process and its toluene equilibrium adsorption behavior was investigated. The preparation process of the porous carbon was composed of following sub-processes in series: synthesis and template preparation of silica gel, impregnation and polymerization of DVB monomer in silica template, carbonization of DVB polymer in a silica-polymer composite, and HF-assisted selective etching of silica in carbon-silica composite, The prepared porous carbon was nano porous and had ultrahigh specific surface area (2007 m{sup 2}/g) and large pore volume (3.07cm{sup 3}/g). The nanoporous carbon showed rapid toluene adsorption rate and good toluene adsorption capacity, compared with a commercial Y-type zeolite, In the present study, a reverse replication process to prepare nanoporous carbons ...

2003-06-01

40

Selective Reduction of Nitro Compounds Using CeY Zeolite Under Microwaves

The preparation and performance of membranes for application to hydrogen separation from coal-derived gas is described. The membrane material investigated was dense amorphous silica deposited on a suitable support by chemical vapor deposition (CVD). Two types of support materials were pursued. One type consisted of a two-layer composite, zeolite silicalite/{alpha}-Al{sub 2}O{sub 3}, in the form of tubes approximately 0.7 cm in diameter. The other type was porous glass tubes of diameter below 0.2 cm. The first type of support was prepared starting from {alpha}-Al{sub 2}O{sub 3} tubes of 1{micro}m mean pore diameter and growing by hydrothermal reaction a zeolite silicalite layer inside the pores of the alumina at the OD side. After calcination to remove the organic template used in the hydrothermal reaction, CVD was carried out to deposit the final silica layer. CVD was carried out by alternating exposure ...

2004-04-01

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41

Hydrocarbon cracking catalysts and processes for utilizing the same

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2010-02-01

42

Effect of modification on catalytic properties of NaY zeolites

This patent describes a catalyst comprising: (a) a non-zeolitic inorganic oxide matrix, and (b) an ultrastable Y-type crystalline zeolite, the ziolite having been pretreated by contacting the zeolite with a phosphorus compound selected from the group consisting of phosphoric acid, phosphorous acid, a salt of phosphoric acid, a salt of phosphorous acid, and mixtures thereof for a time sufficient to composite an effective amount of phosphorus with the zeolite.

1989-06-13

43

Application of zeolite-based catalyst to hydrocracking of coal-derived liquids

The effect of treatment with hydrogen, hydrogen sulfide, and steam on the catalytic properties of NaY zeolites has been studied. A mechanism has been proposed for activation of the zeolites, which explains the appearance of Broensted acid centers on modified samples. The influence of modification temperature and the degree of decationization of the zeolites on the promoting capacity of the latter in the cumene cracking reaction has been studied.

1988-04-01

44

Catalysis over activated high silica zeolites

Y-zeolite supported catalysts were applied to the hydrocracking of coal-derived liquids. By the introduction of two-stage upgrading consisting of hydrotreating and hydrocracking, Wandoan coal-derived middle distillate was hydrocracked over Ni-Mo/Y-zeolite, producing a high gasoline fraction yield. Zeolite supported catalysts gave little hydrocracked compounds in the hydroprocessing of coal-derived heavy oils, even after hydrotreatment. The reaction inhibitors which seriously poison the active sites of zeolites were found to be small nitrogen-containing molecules. In the hydroprocessing of coal-derived heavy oils, zeolite supported catalysts were inferior to alumina supported catalysts. This is due to the high hydrocracking but low hydrogenation activity of zeolite supported catalysts. 22 refs., 5 figs., 11 tabs.

1990-06-01

45

Support effects on CO hydrogenation over Ru/zeolite catalysts

A process is provided for conducting organic compound conversion over a catalyst composition comprising a specially treated crystalline zeolite having a high initial silica-to-alumina mole ratio, said zeolite having been synthesized from a reaction mixture comprising a diamine as a cation source. The treatment of the zeolite material comprises the sequential steps of reacting the zeolite with a dilute hydrogen fluoride solution, contacting the hydrogen fluoride solution reacted material with aluminum chloride vapor, and then treating the aluminum chloride contacted material to convert it to hydrogen form.

1985-05-07

46

Catalytic desulfurization of organic sulfur compounds over zeolite catalysts

Hydrogenation of carbon monoxide at 101.3 kPa has been studied over a series of ion-exchanged Ru catalysts supported on NaX, NaY, KL, Na mordenite, and HY zeolites. The type of zeolite had pronounced effects on the activity and selectivity of the Ru. The specific activity would appear to be related to the dispersion of reduced ruthenium in the zeolite. Methane selectivity, however, seems to be strongly influenced by the type and concentration of alkali cations remaining in the ion-exchanged zeolite. These cations appear to promote chain growth much as traditional alkali promoters would, though perhaps more indirectly. Due to bifunctional properties of the zeolite-supported catalysts, a significant fraction of C/sub 4/ was in the form of isobutane. Formation of isobutane seems to be related to either the Si/Al ratio in the zeolites or the concentration of the ...

1984-02-01

47

Acid-site distribution on Faujasite-type zeolites determined by n-butylamine titration--1. Comparison of the use of hammett and arylmethanol indicators on zeolites X

In the dehydrodesulfurization of ethanethiol at 400/sup 0/C, the activities of sodium X, Y, and A zeolites decreased in the order given as did the activities of nickel, cobalt, zinc, cadmium, copper, silver, lead, manganese, barium, calcium, sodium, and iron Y zeolite catalysts. A volcano-shape order was observed between the catalytic activity and the electronegativity of the metal ions. The changes in the activity of hydrogen Y zeolite catalyst in ethanethiol dehydrodesulfurization and cumene dealkylation by calcination agreed with the decrease in the Broensted acidity but were independent of Lewis acidity. For hydrodesulfurization of thiophene, the activities of nickel, cobalt, copper, and silver Y zeolite catalysts decreased in the order given and were greater than for a commercial hydrodesulfurization catalyst; reduced and presulfided catalysts showed selective hydrodesulfurization activity. ...

1980-01-01

48

Thermal stability and acid resistance of aluminosilicophosphate zeolites

The combined Lewis and Broensted acidities were measured of 13X (sodium) zeolite and of its 84.2% calcium-exchanged, 86.0% lanthanum-exchanged, and 69.2% protonated forms, calcined at 400/sup 0/C. The butylamine titrations were performed to visible color changes of Hammett indicators. The H/sub 0/ acidities were 0 for the sodium X zeolite, and 0.2, 0.98, and 0.75 for the calcium, lanthanum, and hydrogen zeolites, respectively. These acidities compared well with trends reported in literature for zeolites pretreated under different conditions. Titration of Broensted sites with arylmethanol indicators did not give satisfactory visible endpoints.

1980-05-29

49

Sulfur compound cleanup: molecular sieves for SO/sub 2/ removal

By isomorphous replacement of silicon by phosphorus the authors have synthesized crystalline aluminosilicophosphates with structures of the zeolites type A and faujasite. They determine the adsorption capacity of specimens treated at 575-1275/sup 0/K. They show that the thermal stability and acid resistance of aluminosilicophosphates depend on the quantity of phosphorus in their structure.

1987-04-01

50

Orthophosphoric acid interactions with ultrastable zeolite Y: Infrared and NMR studies

The progress of laboratory studies on the removal of NO/sub x/ and SO/sub 2/ with zeolite molecular sieves is reported. The trademark of these zeolite molecular sieves is Zeolon. (LK)

1976-08-01

51

A correlation of the acidity and catalytic activity of zeolites

Zeolite Y is the active component of most commercial cracking catalysts. Interaction of H[sub 3]PO[sub 4] with extraframework aluminum of ultra-stable zeolite (USY) leads to the formation of different types of aluminum phosphates, while there is no indication of the formation of SAPO zeotype structures. The total acidity of USY slightly decreases upon the H[sub 3]PO[sub 4] treatment, while the maximum in the distribution of acid strength is shifted to milder acidities. Dealumination of the zeolite and creation of POH sites associated with AIPO[sub 4] are responsible for the modifications observed. 37 refs., 8 figs., 3 tabs.

1994-01-01

52

Reclaiming silver from silver zeolite

This paper obtains the acidity spectra of modernites and SVK-zeolites from the heats of adsorption of NH/sub 3/ at 300 C and compares the catalytic activity of these zeolites with the cracking of n-octane and the isomerization of o-xylene. It is shown that the calculation of the specific catalytic activity of centers of different strengths by the method of regional rates allows one to predict the activity of the zeolites from the acidity spectra. It follows from the calculation that only the centers of Bronsted acidity are active towards cracking but that the centers of Lewis acidity are also active towards isomerization.

1985-12-01

53

[Experimental and kinetic modeling of acid/base and redox reactions over oxide catalysts

Silver zeolite is used to capture radioiodines from air cleaning systems in some nuclear facilities at the Idaho National Engineering Laboratory. It may become radioactively contaminated and/or poisoned by hydrocarbon vapors, which diminishes its capacity for iodine. Silver zeolite contains up to 38 wt% silver. A pyrometallurgical process was developed to reclaim the silver before disposing of the unserviceable zeolite as a radioactive waste. A flux was formulated to convert the refractory aluminosilicate zeolite structure into a low-melting fluid slag, with Na{sub 2}O added as NAOH instead of Na{sub 2}CO{sub 3} to avoid severe foaming due to CO{sub 2} evolution. A propane-fired furnace was built to smelt 45 kg charges at 1300C in a carbon-bonded silicon carbide crucible. A total of 218 kg (7000 tr oz) of silver was reclaimed from 1050 kg of unserviceable zeolite. Silver recoveries ...

1991-10-01

54

Investigation of Distributions of Mn2+ Ions in Fully Dehydrated and Fully Mn2+-exchanged Zeolites Y, |Mn37.5|[Si117Al75O384]-FAU

The research has involved the characterization of catalyst acidity, [sup 2]D NMR studies of Bronsted acid sites, and kinetic, calorimetric, and spectroscopic studies of methylamine synthesis and related reactions over acid catalysts. Approach of this work was to explore quantitative correlations between factors that control the generation, type, strength, and catalytic properties of acid sites on zeolite catalysts. Microcalorimetry, thermogravimetric analysis, IR spectroscopy, and NMR spectroscopy have provided information about the nature and strength of acid sites in zeolites. This was vital in understanding the catalytic cycles involved in methylamine synthesis and related reactions over zeolite catalysts.

1993-01-01

55

Effect of different treatments on acid centers of very high silicon zeolites studied by ir spectroscopy

Full Text Available

2010-08-01

56

Adsorption of hydrocarbon binary mixtures in a vapour phase to ion exchange forms of X type zeolite

Using the infrared spectroscopy method, we have studied the effect of thermal dehydration (under vacuum and in air) and treatment with water vapor on the acid centers of very high silicon zeolites of the ZSM type. We have shown that dehydration under vacuum and in air completely and irreversibly removes the OH groups at 1120/sup 0/K, while treatment with water vapor removes these groups at 770/sup 0/K. The Lewis acid centers of dehydrated zeolites (represented by two types of centers) are more heat-stable than the Bronsted acid centers, but the vapor treatment at 1020/sup 0/K leads to the disappearance of the Lewis acid centers. In this work, we discuss the reasons for destruction of the acid centers of the zeolites under different treatment conditions.

1986-08-01

57

[Preparation of titanium dioxide particles and properties for flue gas desulfurization].

Russian (Jan 1978). USSR Chorna, IM Beshta, EI Kvitkovskij, LN L'vovskij

58

Development of a stable cobalt-ruthenium Fischer-Tropsch catalyst. Technical progress report No. 12, July 1, 1992--September 30, 1992

Under different sintering temperatures(340 degrees C, 440 degrees C, 540 degrees C, 640 degrees C), four TiO2 particles were prepared. The crystal types of all four samples were found to possess anatase structures by XRD. It was obtained by N2 experimental adsorption at low temperature (77K) that their surface areas and average pore size were between 79 and 124 m2/g, 56.8 and 254.8 A respectively. The pore structure of TiO2 particles was characterized by scanning electron microscope (SEM). The tests of adsorption dynamics for FGD and the performance of SO2 removal were investigated in a fixed-bed system for different samples. The results show that SG540 sample which made at 540 degrees C sintering temperature had the most quality among the four samples. It can adsorb SO2 of 38.9 mg for one gram SG540 sample. Different operating conditions for SG540 such as adsorption temperature, SO2 concentration in flue gas and the superficial velocity of flue gas were ...

2003-01-01

59

Phosphorus-containing catalyst and catalytic cracking process utilizing the same

The fixed bed pilot plant, the catalyst testing procedure, and the calculations for conversion and selectivities were previously described in the technical progress report covering the period of 3/16/88 to 6/16/88 for Contract DE-AC22-87PC79812. Conversions and hydrocarbon selectivities were calculated using data from an on-line gas chromatography (GC) analyzer. Alcohol selectivities were calculated using data from an on-line boiling point GC analyzer which analyzed the liquid product. The catalysts were prepared via the steps of impregnation, calcination, and reduction on a special Y-zeolite-derived support. The impregnation step consisted of evaporation of metal salts on to the support from an aqueous solution. For one catalyst (No. 6531-188) the metal salts were evaporated on to the support from a reverse micelle solution containing the metal salts. All the catalysts were calcined for four hours at 450{degree}C. The calcined catalysts were ...

1992-12-31

60

Phosphorus-containing catalyst and catalytic cracking process utilizing the same

A phosphorus-containing low alkali metal content zeolitic catalyst made from a clay starting material is provided. The catalyst is obtained by contacting a partially cation exchanged calcined zeolite-containing catalyst with a dihydrogen phosphate anion or a dihydrogen phosphite anion. A hydrocarbon catalytic cracking process utilizing the phosphorus-containing catalyst is also provided.

1985-02-12

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

61

Mineralogy of clay and zeolite dusts (exclusive of 1:1 layer silicates)

A phosphorus-containing low alkali metal content zeolitic catalyst made from a clay starting material is provided. The catalyst is obtained by contacting a partially cation exchanged calcined zeolite-containing catalyst with an anion such as a dihydrogen phosphate anion or a dihydrogen phosphite anion and additionally with an ammonium salt other than a salt of an inorganic acid of phosphorus. A hydrocarbon catalytic cracking process utilizing the phosphorus-containing catalyst is also provided.

1985-03-12

62

Evidence for the nature of true Lewis sites in faujasite-type zeolites

Clays and zeolites are among the most important of natural dusts by virtue of their occurrence through out the world on the earth`s surface and their important industrial uses. (The 1:1 layer silicates, including the serpentine and kaolin minerals, are not addressed in this chapter.) This chapter provides basic information on a variety of important aspects of each mineral, including crystal structure diagrams of each and references to more detailed discussions. 110 refs., 20 figs.

1993-12-31

63

Treatment of Produced Waters Using a Surfactant Modified Zeolite/Vapor Phase Bioreactor System

An IR spectroscopic study of the reduction of copper-exchanged Linde Na-Y zeolite with hydrogen or carbon monoxide and oxidation with oxygen or oxygen-18 showed that copper(I) and AlO(+1) are formed during reduction, and that oxidation generates copper(II) ions but does not change the aluminum species. Trigonally coordinated aluminum was not detected.

1979-05-03

64

Proton-loaded zeolites. 2. Dehydrohalogenation versus decationization kinetics: Cation and acidity effects

This report summarizes work performed on this project from October 2004 through March 2005. In previous work, a surfactant modified zeolite (SMZ) was shown to be an effective system for removing BTEX contaminants from produced water. Additional work on this project demonstrated that a compost-based biofilter could biodegrade the BTEX contaminants found in the SMZ regeneration waste gas stream. However, it was also determined that the BTEX concentrations in the waste gas stream varied significantly during the regeneration period and the initial BTEX concentrations were too high for the biofilter to handle effectively. A series of experiments were conducted to determine the feasibility of using a passive adsorption column placed upstream of the biofilter to attenuate the peak gas-phase VOC concentrations delivered to the biofilter during the SMZ regeneration process. In preparation for the field test of the SMZ/VPB treatment system in New Mexico, ...

2005-03-11

65

The work presented in part 1 of this study established that the sorption of anhydrous HX into dehydrated Na{sub 56}Y progresses through a sequence of steps involving HX ionization and charge separation, oxygen framework protonation, formation of {alpha}-cage confined cation-anion contact ion pairs, and proton solvation by HX. A logical extension, which is the subjected of this study, concerns the effect of extraframework alkali metal cation type (M = Li{sup +}, Na{sup +}, K{sup +}, Rb{sup +}, Cs{sup +}) on the sorption process. The question of the acidity of proton-loaded zeolites compared to Broensted acid zeolites is addressed by using probe reactions with weak bases like ethane and cyclopropane. Additional insight into these systems is also obtained from a quantitative comparison of the kinetic and thermodynamic activation parameters for the dehydrohalogenation of proton-loaded zeolites exemplified by (HX){sub 8}Na{sub ...

1990-10-18

66

Multi-fragmentation

No abstract prepared.

1998-08-01

67

BIOINORGANIC CHEMISTRY

Zeolite-supported catalysts. Report for August 1986-November 1987

No abstract prepared.

2002-01-01

68

Sorbent materials for fusion reactor tritium processing

The present paper is a comparative study of the cerium-containing nickel catalysts supported on x- and y-zeolites. In general, the addition of cerium ions caused an increase in the catalytic activity for CO hydrogenation and shifted the product selectivity to high molecular weight hydrocarbons. The degree of the effect of cerium additive depends on the ratio of cerium to nickel contents, the reduction temperature, and the nature of the supporting materials. Catalyst characterization, including volumetric hydrogen chemisorption, temperature programmed reduction/desorption, x-ray diffraction, surface area measurements, in-situ infrared spectroscopy and x-ray photoelectron spectroscopy, was performed in order to interpret the phenomena due to the effects of cerium additives and the support effect on Ni/zeolite catalysts.

1988-01-01

69

Oxidation of aromatic alcohols on zeolite-encapsulated copper amino acid complexes

A fusion reactor (such as NET/ITER) which breeds its own tritium fuel requires tritium recovery, purification and separation from the other isotopes. Cyclic adsorption processes are strong candidates for several of the processes involved: amongst other advantages, they promise a low tritium inventory. A good adsorbent for such processes must have high adsorption capacity, high selectivity and very low tritium retention after each cycle. Pure zeolite powder is shown to have an excellent combination of these three properties. However, in practice problems can arise from tritium which is not removed by reactivation. In this paper we show that tritium retention in zeolites can be caused either by water retained in the zeolite structure, which can be removed by ore rigorous activation, or by water tapped on binders in commercial pellets. (orig.).

1995-03-01

70

Kinetics and mechanism of the reaction between portland cement and clinoptilolite

Copper complexes of the amino acids histidine, arginine and lysine have been introduced into the supercages of zeolite Y and, for the first time, into the large intracrystalline cavities of zeolites EMT and MCM-22. The resulting host/guest compounds are characterized by X-ray powder diffraction, UV/VIS-spectroscopy in the diffuse reflectance mode and by catalytic tests in the liquid-phase oxidation of aromatic alcohols (viz. benzyl alcohol, 2- and 3-methylbenzyl alcohol and 2,5-dimethylbenzyl alcohol) with tertiary-butylhydroperoxide as oxidant. It was observed that intracrystalline copper-amino acid complexes possess remarkable catalytic activity, yielding the corresponding aromatic aldehydes and acids. (orig.)

1998-12-31

71

High-resolution NMR on /sup 29/Si nuclei in acidic zeolites

When clinoptilolite is immobilized in cement-based composites, a series of reactions occur, leading to release of Cs. These reactions occur in three overlapping stages: a rapid ion exchange, followed by a somewhat slower reaction between clinoptilolite and principally the Ca(OH)_2 component of cement, and, in the longer term, slower reactions with C-S-H leading either to formation of low-lime C-S-H at temperatures below 100"0C or 11 A (1.1 nm) tobermorite at higher temperatures. Kinetic data are presented to evaluate the rate of physical consumption of the zeolites at 70 and 150"0C. Reactions occurring above 100"0C appear to result in the development of extensive microcracking of cement-zeolite composites containing 50% zeolite.

72

Comparative resilience of soil and natural zeolite against adverse features of a municipal sewage. A preliminary investigation

The effect of treatment of Na-forms of zeolites with HCl solutions and of heat treatment of their NH/sub 4/-forms on the stability of aluminum-oxygen tetrahedra has been studied in this work by high-resolution NMR on /sup 29/Si nuclei, using the synthetic zeolites X, Y, and M (mordenite) as the objects of the study. The exchange capacity with respect to Na/sup +/ ions was determined by analyzing the equilibrium solutions after contact of the samples with 0.5 NH/sub 4/Cl solution on a flame photometer. The high-resolution /sup 29/Si NMR spectra of polycrystalline samples were recorded on an SKhR-200 spectrometer with a superconducting solenoid at a frequency of 39.75 MHz with ultrafast mechanical rotation (3 kHz) of the sample at the magic angle to the external magnetic field. The results obtained are given.

1986-12-01

73

Chromate Transport through Surfactant-Modified Zeolite Columns

A research was started aiming at evaluating the possible use of natural zeolites as exchange conditioners to improve and make durable the soil resilience against the adverse effects of the use of anomalous waters for irrigation purposes. This paper deals with a preliminary investigation on the comparative resilience of an Entisol with poor exchange properties and of a Neapolitan yellow tuff (NYT) sample against the adverse features of a dirty municipal sewage (DSW). Results showed that NYT treatment largely and significantly improved the poor soil exchange activity. In particular. NYT exchange sites selectively took up ammonium from DSW. As a consequence, ammonium was trapped, then protected against losses in the environment and, concurrently, exchangeable cations, such as K and Ca, were made free as plant nutrients. The results highlight the possible positive role of zeolitized tuff in restoring and sustaining soil resilience.

74

British Library Electronic Table of Contents (United Kingdom)

Abstract Remediation of ground water containing anionic contaminants presents a great challenge. Because of its low cost, surfactant-modified zeolite (SMZ) has been studied for >10 years for potential uses as permeable barrier materials to remove anionic contaminants from water. In this study, zeolite aggregates with particle size of 3.4 to 4.8 mm were modified by hexadecyltrimethylammonium (HDTMA) bromide, a cationic surfactant, to a surfactant loading level of 80 mmol/kg and a concurrent counterion bromide loading level of 34 mmol/kg. While no retardation of chromate transport was observed for unmodified columns, a retardation factor of 60 was found for chromate transport through the SMZ columns. Slow but persistent desorption of HDTMA occurred throughout the chromate transport experimen...

2006-01-01

75

Transient diffusion, desorption, and reaction studies of cyclopropane and propylene with NaX and Eu/NaX zeolites

Sulfur dioxide oxidation catalyst and process

The exchange of Eu[sup 3+] for Na[sup +] cations into the sodalite cages of X zeolite (Eu[sub 25]Na[sub 11]X) leads selectively to the isomerization reaction of cyclopropane to propylene. The latter reaction is catalyzed by Broensted acid sites with an apparent activation energy of 10.6 kcal/mol. Sorption measurements of cyclopropane and propylene with Eu/NaX and NaX zeolites at 40 C support the view that Na[sup +] cations might be considered as sites for sorption of these molecules. Force fields created by Eu[sub 4]O[sup 10+] present in Eu/NaX zeolite may affect sorption. On the other hand, Broensted acid sites in Eu/NaX enhance sorption of cyclopropane and propylene at 40 C. Chemisorption of propylene on the Broensted acid sites of Eu/NaX is reversible and may occur via a propylene carbenium cation intermediate. Small amounts of hexene are formed during this sorption. The amount of Broensted acid sites in the present ...

1992-05-01

76

Solid state chemistry in catalysis

A catalytic process for the oxidation of sulfur-containing gases , E.G., sulfur dioxide and simultaneous production of sulfuric acid wherein a sulfur-containing gas is reacted with an oxygencontaining gas in the presence of a catalyst comprising an iron group metal on a solid support comprising a zeolite in a silicaalumina matrix.

1981-01-13

77

Control of adsorption by microwave irradiation; Maikuroha nado wo mochiita gas no kyuchaku datsuri seigyo

Correlations between structural aspects of solid materials and their behavior as catalysts are relatively recent. This 20-chapter book focuses on understanding of solid-state mechanisms in heterogeneous catalysis and relationship between catalytic behavior and solid state structure, emphasizing catalysis with oxides, sulfides, and zeolites.

1985-01-01

78

Treatment technology for transuranic waste streams: Cementation, vitrification, and incineration testing for the treatment of spent ion exchange media

Introduced herein is microwave irradiation for the adsorption and desorption of environmental pollutants. Microwaves may be used in two ways, other than through elevation of temperature of a system as a whole with the adsorbent such as activated carbon serving as the heating medium. The first is the application by which desorption is caused to take place of specified molecules. For example, zeolite that has adsorbed water is regenerated when it is irradiated with microwaves in a stream of cooling gas. This is because only the moisture is heated since zeolite is a non-carbon adsorbent that absorbs microwaves but a little. Another case is reported in which microwaves are utilized to desorb H2S, H2O, CO, etc., from molecular sieves. In the second application, coexisting materials different in absorptivity are exposed to irradiation. The adsorption of microwave-absorbent materials is inhibited while that of the others is accelerated. For example, ...

1997-01-25

79

Process for removing sulfur dioxide from gas streams

This document reports the results of testing of spent ion exchange media pretreatment technologies. Emphasis of the testing activities has been on screening pretreatment technologies, such as drying and emulsification, which are compatible with vitrification, cementation, and incineration. Ion exchange media tested for cementation and incineration pretreatment technologies were typical organic ion exchange resins and inorganic zeolites. The ion exchange medium tested for vitrification pretreatment technologies was inorganic zeolite. The results of testing activities are discussed in detail in this report.

1992-04-01

80

Molecular models in the quantum-chemical investigation of the structure of defect centers on oxide catalysts

In the prevention of atmospheric pollution by sulfur dioxide emissions from acid absorbers in contact process sulfuric acid plants in which the unconverted SO/sub 2/ is accumulated by adsorption in a zeolite adsorbent bed and desorbed back into the acid production system, it is found that ambient moist air, after partial dehydration in an acid scrubber is suitably used both to cool down and hot purge desorb the zeolite beds. In addition the pure water derived from the ambient air is advantageously used in the acid-making system.

1976-10-26

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

81

Effect of water on the formation of HSO/sub 3//sup -/ ions upon SO/sub 2/ adsorption onto faujasite-type zeolites

Several possibilities of the use of molecular models in quantum-chemical investigations of the structure of defect centers on the surfaces of oxides on nontransition elements have been illustrated. There has been a special discussion of the assumption of the local nature of the chemical interactions in these systems, which underlies such an approach, and of the consequent laws governing the formation of their lattices in the example cases of zeolites, kaolinites, and comparable boron- and aluminum-containing oxides. A quantum-chemical interpretation of the body of experimental data from investigations of the dehydroxylation of H forms of zeolites has been given. The structure of the Lewis acid centers formed as a result, and their chemisorption properties, have been discussed.

1987-05-01

82

Fabrication and characterization of poly(phenylene oxide)/SBA-15/carbon molecule sieve multilayer mixed matrix membrane for gas separation

SO/sub 2/ adsorption onto faujasite-type zeolites (Na-X, Na-Y) was investigated by combined UV and IR spectroscopy. Formation of chemisorbed HSO/sub 3//sup -/ species, indicated by a UV band around 215 nm and a low-frequency IR band at 1240 cm/sup -1/, was shown to depend significantly upon the presence of water. Differences in the behavior of Na-X and Na-Y were discussed in terms of different site populations.

1987-01-01

83

Enhanced Activity of Nanocrystalline Zeolites for Selective Catalytic Reduction of NOx

A novel multilayer mixed matrix membrane (MMM), consisting of poly(phenylene oxide) (PPO), large-pore mesoporous silica molecular sieve zeolite SBA-15, and a carbon molecular sieve (CMS)/Al{sub 2}O{sub 3} substrate, was successfully fabricated using the procedure outlined in this paper. The membranes were cast by spin coating and exposed to different gases for the purpose of determining and comparing the permeability and selectivity of PPO/SBA-15 membranes to H{sub 2}, CO{sub 2}, N{sub 2}, and CH{sub 4}. PPO/SBA-15/CMS/Al{sub 2}O{sub 3} MMMs with different loading weights of zeolite SBA-15 were also studied. This new class of PPO/SBA-15/CMS/Al{sub 2}O{sub 3} multilayer MMMs showed higher levels of gas permeability compared to PPO/SBA-15 membranes. The permselectivity of H{sub 2}/N{sub 2} and H{sub 2}/CH{sub 4} combinations increased remarkably, with values at 38.9 and 50.9, respectively, at 10 wt% zeolite loading. Field ...

2010-07-15

84

Preparing the works for the St-Genis roundabout.

Nanocrystalline zeolites with discrete crystal sizes of less than 100 nm have different properties relative to zeolites with larger crystal sizes. Nanocrystalline zeolites have improved mass transfer properties and very large internal and external surface areas that can be exploited for many different applications. The additional external surface active sites and the improved mass transfer properties of nanocrystalline zeolites offer significant advantages for selective catalytic reduction (SCR) catalysis with ammonia as a reductant in coal-fired power plants relative to current zeolite based SCR catalysts. Nanocrystalline NaY was synthesized with a crystal size of 15-20 nm and was thoroughly characterized using x-ray diffraction, electron paramagnetic resonance spectroscopy, nitrogen adsorption isotherms and Fourier Transform Infrared (FT-IR) spectroscopy. Copper ions were ...

2006-12-31

85

CERN Document Server

Preparing the works for the St-Genis roundabout.

1999-01-01

86

Waste to energy technologies.

Temperature of exploding nuclei

No abstract prepared.

2010-04-01

87

No abstract prepared

1999-10-01

88

Status report ANKE

Pionic fusion on the deuteron

No abstract prepared.

2002-03-01

89

Nano technology and radiotracers

No abstract prepared.

2002-03-01

90

NEUTRINOS, PAST AND PRESENT.

No abstract prepared.

2008-10-15

91

Human cornea glycosaminoglycans

No abstract prepared.

2002-10-11

92

Passive, integrated measurement of radon using 5A synthetic zeolite and blue silica gel

No abstract prepared.

1997-07-01

93

Mobil/Badger to market zeolite-based cumene technology

Synthetic zeolite of 0.5 nm pore size (5A) and blue silica gel were tested to determine their capability to be used as radon collectors. Tests conducted in a radon chamber under controlled conditions of temperature and relative humidity indicate that simple, inexpensive and maintenance-free passive devices containing about 250 g of synthetic zeolite or about 270 g of blue silica gel in open face metal canisters that can measure radon conveniently and adequately, the latter though being suitable only for dry-medium dry atmosphere with quite high radon concentrations. Both materials can be recycled for reuse, in a way similar to the recycle and reuse of active carbon. The amount of radon adsorbed in such collectors is determined by counting the gamma rays from the radon decay products. The lower limit of detection (LLD) is estimated to {approx}45 Bqm{sup -3} for the synthetic zeolite and to {approx}350 Bqm{sup -3} for the ...

2010-01-15

94

[sup 1]H[[sup 27]Al] double-resonance experiments in solids. An unexpected observation in the [sup 1]H MAS spectrum of zeolite HZSM-5

Badger (Cambridge, MA) and Mobil (Fairfax, VA) are ready to jointly license a new cumene technology that they say achieves higher yields and product purity than existing processes. The zeolite-based technology is scheduled to be introduced at next month's DeWitt Petrochemical Review in Houston. The Mobil/Badger technology aims to challenge the dominant position of UOP's (Des Plaines, IL) solid phosphoric acid (SPA) catalyst process - which accounts for 80%-90% of the world's cumene production. In addition, Monsanto/Kellogg's aluminum chloride-based technology has gained significant momentum since its introduction in the 1980s. And late last year, ABB Lummus Crest (Bloomfield, NJ) also began marketing a zeolite-based cumene technology. While all the technologies make cumene via the alkylation of benzene with propylene, the Mobil/Badger process uses a zeolite-containing catalyst designed by ...

1993-02-24

95

Ultrathin coatings of nanoporous materials as property enhancements for advanced functional materials

We report the existence of a previously unsuspected peak in the [sup 1]H magic angle spinning spectrum of commercially available HZSM-5 samples. At 298 K, this resonance is a broad shoulder on the downfield side of the Bronsted acid signal at 4.3 ppm. Cooling the sample caused the line to narrow, and a clear peak at 6.9 ppm was visible at 123 K. This technique resulted in selective broadening of the 4.3 and 6.9 ppm resonances as a result of conflicting averaging of the [sup 1]H-[sup 27]Al dipolar coupling. We conclude that the 6.9 ppm resonance corresponds to a novel aluminum-containing site in zeolite HZSM-5 and is not an artifact due to exchange with the Bronsted site or an aluminum-rich impurity phase. A possible interpretation of these results is a second Bronsted site for the zeolite. 49 refs., 8 figs.

1994-10-19

96

Performance of zeolite-supported catalysts for selective catalytic reduction of nitric oxide and oxidation of methane

This report summarizes the findings of a five-month LDRD project funded through Sandia's NTM Investment Area. The project was aimed at providing the foundation for the development of advanced functional materials through the application of ultrathin coatings of microporous or mesoporous materials onto the surface of substrates such as silicon wafers. Prior art teaches that layers of microporous materials such as zeolites may be applied as, e.g., sensor platforms or gas separation membranes. These layers, however, are typically several microns to several hundred microns thick. For many potential applications, vast improvements in the response of a device could be realized if the thickness of the porous layer were reduced to tens of nanometers. However, a basic understanding of how to synthesize or fabricate such ultra-thin layers is lacking. This report describes traditional and novel approaches to the growth of layers of microporous materials on silicon wafers. The ...

97

Development of non-phosphate detergent with zeolite and. alpha. -olefin sulfonate. Zeolite-AOS ni yoru senzai no murinka

The selective catalytic reduction of nitric oxide by methane over copper ion-exchanged natural zeolites was investigated in a packed-bed tubular reactor. The catalytic activity of Cu-N and Cu-H-N catalysts was confirmed as NO, CH{sub 4}, and O{sub 2} displayed very little reaction in the absence of any catalyst and zeolite without ion exchange was totally inactive. A maximum NO conversion of 33% at 650 C for Cu-N-66 was achieved with 2% NO and 1% CH{sub 4} and a contact time of 0.9 g s/cm{sup 3}, but the introduction of 2% O{sub 2} reduced the NO conversion to only 12%. Ion exchange for the H-form prior to copper ion exchange was essential for oxygen to promote catalytic activity over the temperature range 250--650 C, with a maximum conversion of 30% at 450 C with O{sub 2} present. The direct reduction of NO by methane was ruled out as a possible reaction pathway.

1997-11-01

98

A simple model for strontium breakthrough on zeolite columns

Development was explained of non-phosphate detergent with zeolite (Z) and alpha-olefin sulfonate (AOS). 4A type Z was taken notice of as a builder to replace phosphate. In calcium ion trapping power, conventional sodium tripolyphosphate (STP) and Z are 158mgCaO/g and 150mg/g, respectively. However, because Z by the conventional method is large in crystal diameter, coagulates and adheres to matter to be washed, was newly developed fine Z, 0.9 {mu} m in primary grain diameter, which does not give abrasion nor occlusion to the washing machine, nor precipitate in the river. Because linear alkylbenzene sulfonate, combined with Z, is poorer in washing power than that, done with STP, was developed AOS, new non-phoshate use interfacial active detergent, which is excellent in all washing power, biodegradation speed and physical powder property. Improvement was variously made also in powdery detergent production technology. Though the non-phosphate detergent controlled water ...

1990-07-01

99

Two-step biodiesel production from Calophyllum inophyllum oil: Optimization of modified b-zeolite catalyzed pre-treatment

The Process Waste Treatment Plant (PWTP) at the Oak Ridge National Laboratory is designed to remove radioactive contaminants, principally {sup 90}Sr, from process wastewater. Planned upgrades to the PWTP will use chabazite zeolite columns. Pilot-scale studies have shown that mass transfer zone lengths increase from 10 to about 30 cm as the superficial velocity increases from 5.5 to 22 cm/min. Calculations with a multicomponent equilibrium model showed that the distribution coefficient for strontium remains essentially constant over the process conditions, suggesting that a simple kinetic model (the Rosen long-bed solution) should adequately represent breakthrough behavior. Using a distribution coefficient of 4.87 L/g predicted by the equilibrium model, good agreement was found between experimental breakthrough curves and those calculated with the Rosen solution. This model allows prediction of bed depths and cycle times necessary to achieve the required ...

1995-04-01

100

British Library Electronic Table of Contents (United Kingdom)

In this study, a two-step process was developed to produce biodiesel from Calophyllum inophyllum oil. Pre-treatment with phosphoric acid modified b-zeolite in acid catalyzed esterification process preceded by transesterification which was done using conventional alkali catalyst potassium hydroxide (KOH). The objective of this study is to investigate the relationship between the reaction temperatures, reaction time and methanol to oil molar ratio in the pre-treatment step. Central Composite Design (CCD) and Response Surface Methodology (RSM) were utilized to determine the best operating condition for the pre-treatment step. Biodiesel produced by this process was tested for its fuel properties.

2011-01-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

101

Removal of reactive textile dyes (Remazol Brillant Blue R and Remazol Yellow) by surfactant-modified natural zeolite

British Library Electronic Table of Contents (United Kingdom)

Abstract In this study, surfactant-modified zeolite (SMZ) was used to remove Remazol Brillant Blue R and Remazol Yellow reactive dyes from aqueous solutions. The influences of suspension pH, temperature, agitation rate, and the SMZ dosage on reactive dyes removal and adsorption capacity were investigated by conducting a series of batch adsorption experiments. The adsorption kinetics was tested for pseudo-first-order, pseudo-second order, intraparticle diffusion model, Elovich, and Bangham models, and rate constants of the kinetic models were calculated. Equilibrium isotherms for the adsorption of reactive dyes were analyzed by the Freundlich, Langmuir, Dubinin-Radushkevich, and Tempkin isotherm models. The Langmuir monolayer adsorption capacities of Remazol Brillant Blue R and Remazol Yell...

2011-01-01

102

Photocatalytic degradation of gaseous pyridine over zeolite-supported titanium dioxide

Neutron magnetic scattering studies on ferromagnetism in potassium nanoclusters arrayed in zeolite A-Trial experiments

The photocatalyzed degradation of pyridine in the gas phase was investigated using titanium dioxide semiconductor supported on mordenite. The complete mineralization was found to occur over a catalyst containing 75 wt% TiO{sub 2} and 25 wt% mordenite in about 180 min in the presence of saturated water vapor at O{degrees}C (4.6 Torr). Low water vapor pressure of 0.096 Torr was found to be sufficient to achieve a reasonably high percentage and rate of degradation. Diffusion of pyridine within the catalyst adversely affects the activity when the thickness of the catalyst coating exceeds the penetration depth of illumination. The activity of the zeolite-supported catalysts was higher than that of TiO{sub 2}. The photonic efficiency for the complete mineralization of pyridine to CO{sub 2} was determined to be 0.48. 29 refs., 6 refs., 1 tab.

1994-09-01

103

Neutron magnetic scattering studies on ferromagnetism in potassium nanoclusters arrayed in zeolite A-Trial experiments

Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low temperature. The origin of the spontaneous magnetization has been explained by a model of spin-canting in an antiferromagnetically ordered state. The direct information for the magnetic structure, however, has not been obtained so far. In the present work, we measure the neutron powder diffraction by using pulsed neutron source at KEK-KENS below and above the Curie temperature. No significant temperature-dependence was, however, obtained within the statistical errors, namely, magnetic scattering could not be detected separately. We also estimate the intensity of magnetic scattering by assuming some possible magnetic structures with considering the magnetic form factor of the cluster wave function. The intensity of magnetic scattering is estimated to be extremely weak and higher S/N of {approx}10{sup 4} or more is required to detect the magnetic scattering of this material.

2009-02-21

104

Kinetic study of the cracking, isomerization, and disproportionation of n-heptane on a chromium-exchanged Y zeolite

Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low temperature. The origin of the spontaneous magnetization has been explained by a model of spin-canting in an antiferromagnetically ordered state. The direct information for the magnetic structure, however, has not been obtained so far. In the present work, we measure the neutron powder diffraction by using pulsed neutron source at KEK-KENS below and above the Curie temperature. No significant temperature-dependence was, however, obtained within the statistical errors, namely, magnetic scattering could not be detected separately. We also estimate the intensity of magnetic scattering by assuming some possible magnetic structures with considering the magnetic form factor of the cluster wave function. The intensity of magnetic scattering is estimated to be extremely weak and higher S/N of ?104 or more is required to detect the magnetic scattering of this material.

2009-02-21

105

Cluster approach to quantum-chemical calculations of chemisorption and heterogeneous catalytic systems

The kinetic rate constants for the cracking, isomerization, and disproportionation of n-heptane over a CrHNaY (32% chromium exchanged) zeolite catalyst at 400, 450, and 470/sup 0/C have been calculated. The interaction of n-heptane with a model Lewis acid such as BF/sub 3/ and progress along the reaction coordinate have been studied by means of molecular orbital calculations. From the kinetic results, i.e., activation energies and frequency factors, and the theoretical calculations, it can be concluded that the controlling step in these reactions is not the formation of the carbonium ion, but the subsequent transformation of this carbonium ion. In addition, the theoretical calculations show that the attack of a Lewis acid is more likely to occur on a carbon atom than on a C-H bond.

1982-09-01

106

Alkylation of anisole with 1-hexene and 1-hexanol over zeolite H-beta

The increasing use of quantum-chemical methods in catalysis has underscored the importance of developing and improving semiempirical approximations oriented toward calculations of the total energy and geometry, offering a means for examining intermolecular interactions. In this article a general approach is proposed, using weighting factors for certain regions of distances, i.e., introducing different parametrization into the various regions. A scheme designated MINDO/3-HB is presented as an extension of the MINDO/3 scheme to the region of hydrogen bonds and ..pi..-complexes of olefins with Broensted acid centers (BACs). Examples of cluster calculations are given for the adsorption of ammonia, pyridine, ethylene, and ethanol on the BACs of zeolites. In the example of the process of zeolite synthesis, the possibilities of the cluster approach are discussed for calculations related to the formation of catalysts.

1987-07-01

107

British Library Electronic Table of Contents (United Kingdom)

An examination of the kinetics of the alkylation of anisole with 1-hexene and 1-hexanol to produce alkylates over zeolite H-beta is presented. Anisole alkylation is found to occur by a set of parallel reactions when hexene is used as the alkylating agent. When hexyl alcohol is the alkylating agent, the reaction follows a multi-step parallel-series mechanism to form monoalkylates and dihexylether. With 1-hexene, a group of isomeric alkylates, viz., ortho-2-hexyl anisole (2-OHA), ortho-3-hexyl anisole (3-OHA), para-2-hexyl anisole (2-PHA), and para-3-hexyl anisole (3-PHA) was obtained. With hexanol, the olefin (hexene) and dihexyl ether were obtained additionally. The influence of process parameters like temperature, catalyst quantity, and alkylating agent on reaction behavior is reported.

2011-01-01

108

Sorbent for use in hot gas desulfurization

Selective epoxidation of allylic alcohols with a titania-silica aerogel

A multiple metal oxide sorbent supported on a zeolite of substantially silicon oxide is used for the desulfurization of process gas streams, such as from a coal gasifier, at temperatures in the range of about 1200.degree. to about 1600.degree. F. The sorbent is provided by a mixture of copper oxide and manganese oxide and preferably such a mixture with molybdenum oxide. The manganese oxide and the molybdenum are believed to function as promoters for the reaction of hydrogen sulfide with copper oxide. Also, the manganese oxide inhibits the volatilization of the molybdenum oxide at the higher temperatures.

1993-01-01

109

An amorphous mesoporous titania-silica aerogel (20 wt%TiO{sub 2} - 80 wt% SiO{sub 2}) and tert.-butylhydroperoxide (TBHP) have been used for the epoxidation of various allylic alcohols. Allylic alcohols possessing an internal double bond were more reactive than those with a terminal C=C bond. Epoxide selectivities could be improved by addition of (basic) zeolite 4 A and NaHCO{sub 3} to the reaction mixture. (orig.)

1998-12-31

110

Catalytic chemistry

{sigma}-Hyperon production at COSY-TOF

Most chemical reactions in industry and biology are catalytic and play a role at some stage of the processing of about 80% of the goods manufactured in the U.S., yet catalysis is a neglected subject in chemical education. This book integrates the fragmentary treatment accorded the topic until now. It covers, in a unified way, catalysis in solutions, by enzymes, in synthetic polymers within the molecular scale cages of zeolites and other molecular sieves, and on surfaces of inorganic solids. The central ideas are chemical; and principles are illustrated by emphasizing industrial reactions and catalysts.

1991-01-01

111

{lambda}-Hyperon production at COSY-TOF

No abstract prepared.

2002-03-01

112

Tracing cosmic star formation with EXIST

No abstract prepared.

2002-03-01

113

The TofRoot project - status and perspectives

No abstract prepared.

2004-01-01

114

THE STAR TIME PROJECTION CHAMBER.

No abstract prepared.

2002-03-01

115

Summary of COSY-13 results

No abstract prepared.

1999-05-10

116

Simulation of neutron detector efficiencies

No abstract prepared.

2002-03-01

117

Server Complexity, A Model for Managing Resources

No abstract prepared.

2002-03-01

118

Self-neutralized Ion Implantation into Insulators

No abstract prepared.

1999-12-01

119

Safe landing; Sicher landen

No abstract prepared.

1996-11-01

120

Reliability analysis of pipe whip impacts.

No abstract prepared.

2003-05-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

121

Reaction of ions in radiation chemistry

No abstract prepared.

2005-08-01

122

Quark-Hadron Duality in Mesons Electroproduction

No abstract prepared

1998-01-01

123

Proteome analysis of castor bean seeds

No abstract prepared.

2007-08-01

124

Production of {omega}-mesons at COSY-11

No abstract prepared.

2008-07-01

125

Predictive capability maturity model.

No abstract prepared.

2002-03-01

126

Predictive capability maturity model (PCMM).

No abstract prepared.

2006-03-01

127

PGA of boron- and hydrogen-bearing minerals

No abstract prepared.

2007-01-01

128

Oxygen enrichment of blast in cupola furnace

No abstract prepared

1998-01-01

129

Nuclear physics with a free electron laser

No abstract prepared.

2007-07-01

130

Natural analogue study of Oklo

No abstract prepared.

2002-07-01

131

NETWORK TRAFFIC CHARACTERIZATION OF TCP

No abstract prepared

1998-01-01

132

Molecular portraits of human breast tumours

No abstract prepared.

2000-06-01

133

Methodologies for multiphase reacting flow simulation.

No abstract prepared.

2000-08-01

134

Mechanoluminescence of g-irradiated salt

No abstract prepared.

1997-01-01

135

Measurement of longitudinal distribution of electron beam

No abstract prepared.

2002-07-01

136

LOUISIANA COASTAL WETLANDS MODELING

No abstract prepared.

2001-07-01

137

No abstract prepared.

1999-12-01

138

LCLS XTOD Fixed Mask

Is there a role for financial investors in carbon markets?

No abstract prepared.

2006-10-11

139

Irradiation effects on electronic functional materials

No abstract prepared.

2009-07-01

140

Investigation of Hypergolic Fuels with Hydrogen Peroxide

No abstract prepared

1998-01-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

141

Integrated chip-scale THz technology.

No abstract prepared.

2000-11-15

142

Identification of deuterons with high momenta at ANKE

No abstract prepared.

2009-11-01

143

Heavy-ion RBE and microdosimetric spectra

No abstract prepared.

2002-03-01

144

Handheld trace explosives detector.

No abstract prepared.

2000-09-01

145

Glycosaminoglycan synthesis by human corneal explants

No abstract prepared.

2006-11-01

146

Equivalence classes for gauge theories

No abstract prepared.

1998-07-01

147

Engineering Annual Summary 2003

No abstract prepared.

2008-07-01

148

Emerging laboratory biosecurity issues.

No abstract prepared.

2004-07-21

149

Direct measurement of flow in fractures.

No abstract prepared.

2005-04-01

150

Data-model integration is not magic

No abstract prepared.

2004-06-01

151

Data and facts; Daten und Fakten

No abstract prepared.

2005-03-01

152

Atmospheric Processing Platform (Presentation)

No abstract prepared.

2008-03-15

153

Accelerator parameters for gamma gamma colliders

No abstract prepared.

2008-04-01

154

A study of neutron transmutation doped germanium

No abstract prepared.

1995-02-01

155

A Software Quality Engineering Maturity Model

No abstract prepared

1998-01-01

156

2004 RERTR International Proceedings

No abstract prepared.

2009-05-08

157

VEHICLE OPERATION PLAN PREPARATION INFORMATION, RECORDING MEDIUM, AND VEHICLE OPERATION PLAN PREPARATION DEVICE

No abstract prepared.

2004-11-07

158

J-STORE (Japan)

Full Text Available

2007-11-22

159

Secondary fuel for power generation - preparation, technology, cost; Sekundaerbrennstoff zur energetischen Verwertung - Aufbereitung, Technik, Kosten

PLZT Ceramics Prepared from Conventional and Microwave Hydrothermal Powders

No abstract prepared.

2001-07-01

160

CERN Document Server

PLZT Ceramics Prepared from Conventional and Microwave Hydrothermal Powders

1999-01-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

161

Impact of focussed ion beam (FIB) preparation on the potential structure of silicon semiconductors

Synthesis, characterization and catalytic activities of vanadium complexes containing ONN donor ligand derived from 2-aminoethylpyridine

No abstract prepared.

2006-07-01

162

British Library Electronic Table of Contents (United Kingdom)

Reaction between [V^I^VO(acac)2] and the ONN donor Schiff base Hpydx-aepy (I) (Hpydx-aepy=Schiff base obtained by the condensation of pyridoxal and 2-aminoethylpyridine) resulted in the formation of a complex [V^I^VO(acac)(pydx-aepy)] (1). Addition of aqueous 30% H2O2 to 1 yields the poor stable oxidoperoxidovanadium(V) complex [V^VO(O2)(pydx-aepy)] (2). Its formation has also been demonstrated in solution by treating 1 with H2O2 in methanol. Reaction of vanadium exchanged zeolite-Y with I in methanol followed by aerial oxidation gave zeolite-Y encapsulated dioxidovanadium(V) complex, abbreviated as [V^VO2(pydx-aepy)]-Y (4). The crystal and molecular structure of 1 has been determined, confirming the ONN binding mode of the ligand. The encapsulated complex [V^VO2(pydx-aepy)]-Y (4) catalyse...

2011-01-01

163

Research by ESS Division for the Nevada Nuclear Waste Storage Investigations: Progress report, January-June 1985

Polypropylene obtained through zeolite supported catalysts

Petrographic research for the Nevada Nuclear Waste Storage Investigations focused on xenolithic variability in the Topopah Spring Member and on variations of clinoptilolite composition at Yucca Mountain. Zeolite and smectite occurrences were considered in terms of their relation to a disturbed zone beneath the potential repository, and mineral stability experiments have produced a new clinoptilolite structure as a result of prolonged heating at low temperature. Limitations were defined on the abundance of erionite and of sulfur. X-ray diffraction studies lead to improved analytical methods. Progress was made in the comparative study of mineralogy in sand ramps and in faults. Geological modeling considered the differences of the diffusion of nonsorbing tracers in vertically and in horizontally fractured rock. Modeling also treated the diffusion of a nonsorbing tracer in devitrified and in zeolitized rock. The results of these experiments in all ...

1987-10-01

164

Polypropylene obtained through zeolite supported catalysts

Propylene polymerizations were carried out with {phi}{sub 2}C(Flu)(Cp)ZrCl{sub 2} and SiMe{sub 2}(Ind)2ZrCl{sub 2} catalysts supported on silica, zeolite sodic mordenite (NaM) and acid mordenite (HM). The polymerizations were performed at different temperatures and varying aluminium/zirconium molar ratios ([Al]/[Zr]). The effect of these reaction parameters on the catalyst activity was investigated using a proposed statistical experimental planning. In the case of f{sub 2}C(Flu)(Cp)ZrCl{sub 2}, SiO{sub 2} and NaM were used as support and the catalyst performance evaluated using toluene and pentane as polymerization solvent. The molecular weight, molecular weight distribution, melting point and crystallinity of the polymers were examined. The results indicate very high activities for the syndiospecific heterogeneous system. Also, the polymers obtained had superior Mw and stereo regularity. (author)

2004-07-01

165

Oxide acid-base reaction relating to the inhibition of vandium attack on REY zeolite catalysts. [Rare earth-exchanged yttrium

Propylene polymerizations were carried out with #phi#_2C(Flu)(Cp)ZrCl_2 and SiMe_2(Ind)2ZrCl_2 catalysts supported on silica, zeolite sodic mordenite (NaM) and acid mordenite (HM). The polymerizations were performed at different temperatures and varying aluminium/zirconium molar ratios ([Al]/[Zr]). The effect of these reaction parameters on the catalyst activity was investigated using a proposed statistical experimental planning. In the case of f_2C(Flu)(Cp)ZrCl_2, SiO_2 and NaM were used as support and the catalyst performance evaluated using toluene and pentane as polymerization solvent. The molecular weight, molecular weight distribution, melting point and crystallinity of the polymers were examined. The results indicate very high activities for the syndiospecific heterogeneous system. Also, the polymers obtained had superior Mw and stereo regularity. (author)

2004-01-01

166

NMR study on the formation mechanism of #beta#-SiAlON from zeolite by nitridation using ammonia gas

Certain materials, especially Sn, passivate the rare earth-exchanged Y zeolite (REY) used in petrochemical fluid-cracking catalysts against vanadium degradation caused by V impurities in the feed oil. The mechanism of passivation was investigated here from the standpoint of high-temperature oxide acid-base reaction; i.e., where the controlling factors were considered to be Lewis acid-base reactions between V{sub 2}O{sub 5}, the RE oxides, SnO{sub 2}, etc. Molten salt tests at 680{degree}C showed SnO{sub 2}, presumably because of its acidic nature, to be essentially nonreactive with V{sub 2}O{sub 5} or Na{sub 2}O-V{sub 2}O{sub 5} compounds. A hypothesis was developed to explain how the passivation effect by Sn might result from the unique resistivity of SnO{sub 2} to reaction with V{sub 2}O{sub 5}.

1991-05-01

167

Hexene catalytic cracking over 30% sapo-34 catalyst for propylene maximization: influence of reaction conditions and reaction pathway exploration

#beta#-SiAlON was synthesized from a zeolite by NH_3 gas nitridation and its formation mechanism was investigated using X-ray diffraction and "2"9Si and "2"7Al NMR spectroscopy. It was revealed that most of the Si and Al atoms react to form #beta#-SiAlON via amorphous forms of Si-Al-O-N and O-SiAlON. Nitridation using NH_3 gas is an effective means of preventing mullite formation and promoting the introduction of nitrogen into aluminosilicate materials at lower temperatures than temperatures required by the carbothermal reduction nitridation process. Further, the NMR spectra showed that the siliceous part of the system changed into low z-value of Si_6_-_zAl_zO_zN_8_-_z (#beta#-SiAlON) and the incorporation of Al components into the #beta#-SiAlON was promoted in the later stages of the reaction. (author)

2008-09-01

168

Scientific Electronic Library Online (English)

Abstract in english Higher olefins are produced as a by product in a number of refinery processes and are one of the potential raw materials to produce propylene. In the present study, FCC model feed compound was considered to explore the olefin cracking features and options to enhance propylene using 30% SAPO-34 zeolite as catalyst in a micro-reactor. The superior selectivity of propylene (73 wt%) and higher total olefin selectivity was obtained over 30% SAPO-34 catalyst than over Y or ZSM- (more) 5 zeolite catalysts. The thermodynamical constraints were found to be relatively less serious in the case of 1-hexene conversion. Most of the 1-hexene follows a direct cracking pathway to give two propylene molecules, due to weak acid sites and better diffusion opportunities. The higher temperature and short residence time could also suppress the hydrogen transfer reactions. From OPE (olefins performance envelop) the products were classified as ...

2009-12-01

169

Heterogeneous radiolysis of HCN adsorbed on a solid surface

Cyclopropane isomerization over Eu[sup 3+]NaX zeolites

Hydrogen cyanide is a key molecule for chemical evolution studies because, when it is exposed to different sources of energy, it forms various compounds of biological importance. To understand the role of minerals in chemical evolution, a series of experiments was performed. First, the adsorption capacity of HCN on different surface minerals was studied; the results show that HCN is readily adsorbed onto the solids proposed (zeolite, serpentine, dolomite, and sodium montmorillonite), in particular zeolite and montmorillonite. Second, the radiolysis of HCN adsorbed on olivine (as an example of a mineral surface) was also followed; it was found that the rate of HCN decomposition by gamma irradiation is enhanced in the presence of the solid. The third series of studies show that organic material was produced in high abundance from HCN at high radiation doses. The radiolytic products included gases (CO_2, NH_4, and CO) and oligomeric materials that ...

2010-07-01

170

Sulfuric acid catalysts on heterogel supports

Cyclopropane isomerization to propylene over various Eu[sup 3+] loadings in NaX zeolite have been studied by measurements of steady-state and transient kinetics and by Fourier transform infrared spectroscopy. As Eu[sup 3+] loading increases, the rate of deactivation increases, the conversion increases, apparent activation energies are lowered, and Bronsted acid site strength and amounts increase. Apparent activation energies of 13-15 kcal/mol for propylene formation have been observed for these systems, consistent with literature reports for other metal supported heterogeneous catalyst systems. Deactivation studies have shown that activity can be restored by heating in He at 380[degrees]C between various temperature runs, and that gases desorbed during regeneration are predominantly propylene. Poisoning studies of Bronsted sites with Na vapor lead to deactivation of these catalysts. A reaction mechanism scheme based on [pi] allyl intermediates in the supercages of ...

1992-11-01

171

H/sup +/ and OH/sup -/ electrolytes for the 300/sup 0/ - 600/sup 0/C range

Reinforced (heterogel) silicate materials containing an amorphous and a crystalline phase are being used more and more industry. Such systems are energetically unsaturated and therefore promising for use in catalysts. The authors used two reinforced materials as supports: an aluminosilicate containing a zeolite (the cracking catalyst, tseokar) and asbestos-containing aluminosilicate. The active component was introduced by impregnation, and this was followed by heat treatment during which the chemical composition and porous structure were formed. The impregnating mixture consisted of solutions of potassium sulfate and vanadate of the required concentrations. The testing shows that reinforced heterogel systems are promising as support materials for sulfuric acid catalysts.

1985-05-10

172

Alteration of leached glass surface

A research program has been initiated to screen and select electrolyte materials for use in steam electrolyzers in the 300-600/sup 0/C temperature range. Screening of a significant number of acid anhydrides, hydroxides, oxides, and phospates for their electrolytic conductivity properties is underway. Of the binary materials examined to date, only polymerized phosphoric acid, immobilized on an H/sup +/ substituted zeolite, shows promise. A substantial number of ternary compounds remain to be synthesized and evaluated.

1984-08-01

173

A Novel Domperidone Hydrogel: Preparation, Characterization, Pharmacokinetic, and Pharmacodynamic Properties

The leached glass is subject to leachant attack and results in surface layer alteration which greatly affects the corrosion progress of glass forms. This work studied the composition change, precipitation, pitting corrosion as well as surface layer break and spallation of the leached glass forms. 6 conclusions can be made: 1. The extent of surface layer alteration is related to many factors such as temperature, pH, leachant chemistry, flow rate and leach duration, etc. 2. The alkali element Na is seriously depleted and the elements like U.Ti,Fe, Ca and Mg are enriched in the surface layer. The influence of media has such order: Fe{sub 2}O{sub 3} > Na-bentonite > Zeolite. 3. The precipitate formed in leach test for 56 days at 90 {infinity}C is mostly amorphous, but after 91 days has crystallized. There is K - Ca - Al - Si crystal,the amount of Al, K and Si is increasing, but the amount of Ca is decreasing along with leaching time. CaCO{sub 3} crystal ...

1997-07-01

174

{omega} meson production at the Time-Of-Flight spectrometer

The purpose of the present study was to prepare a novel domperidone hydrogel. The domperidone dispersion was prepared by the solvent evaporation method. The characteristics of domperidone dispersion...Full Text Available

2011-01-01

175

Zinc-air battery technology: Combination of mechanical and electrical recharge

No abstract prepared.

2002-03-01

176

X-ray production yield in standardized thick target PIXE

No abstract prepared.

2000-07-01

177

Wavepro : a new approach to the design of data processing work flows.

No abstract prepared.

2003-07-01

178

WATER AND MAGMA CAN MIX - A HISTORY OF THE CONCEPTS OF HYDROVOLCANISM

No abstract prepared.

2010-07-01

179

VO{sub 2}(B) as a cathode material for lithium battery

No abstract prepared.

2000-09-01

180

Track reconstruction in the hexagonal drift chamber at COSY-11

No abstract prepared.

2002-07-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

181

Theory of the spiral grooved thrust bearing with liquid or gas lubricant

No abstract prepared.

2002-03-01

182

The study on the methods of environmental monitoring using NAA

No abstract prepared.

2003-07-01

183

The devise of the neutron camera for convenient to confirm a sample position

No abstract prepared

1998-01-01

184

The Quality Characteristics of Beef Jerky prepared with Various Spices

No abstract prepared.

2000-10-01

185

The PISA experiment-spallation products identified by Bragg curve spectroscopy

Full Text Available

2004-10-01

186

The Lancashire coalfield, 1945-1972: the politics of industrial change

No abstract prepared.

2004-07-01

187

Testing of the high current implantator of nitrogen ions

No abstract prepared.

2001-06-01

188

Synthetic and bioengineered products in nuclear medicine and drug delivery

No abstract prepared

1999-10-01

189

Supragiottic laryngeal tumors: comparison of MSCT with surgery and histology

No abstract prepared.

1999-07-01

190

Study of quantum chemical calculation of actinide compounds

No abstract prepared.

2002-02-01

191

Study of cement matrices for the immobilization of evaporator concentrates

No abstract prepared

1998-01-01

192

Studies of High-K Isomers at TRIUMF-ISAC

No abstract prepared

1998-12-31

193

Structure studies of acidic galactan from Pomacea sp

No abstract prepared.

2004-03-04

194

Structure and inflammatory activity of acidic galactan from Pomacea sp

No abstract prepared.

2006-07-01

195

Solid-state NMR on polymers and quantum computing NMR

No abstract prepared.

2008-07-01

196

Solid-state NMR Techniques for Chemistry Research

No abstract prepared.

2005-07-01

197

Size-Fractionated Plutonium Isotopes in a Coastal Environment

No abstract prepared.

2000-09-01

198

Single-Molecule Dynamics of Conformational Changes in Flavin Adenine Dinucleotide

No abstract prepared.

2000-09-22

199

Selectivity of lithium isotopes on semicrystalline titanium (IV) phosphate

No abstract prepared.

2005-01-12

200

STRUCTURAL REORGANIZATION IN FILMS OF CELLULOSE DERIVATIVES IN THE PRESENCE OF COLLOIDAL PARTICLES

No abstract prepared.

2001-01-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

201

SC04 network security wrap-up.

No abstract prepared.

2004-01-01

202

Revised plan : recommended investigation at Navarre, Kansas.

No abstract prepared.

2005-02-01

203

Reactor control system using knowledge information

No abstract prepared.

2006-01-31

204

Radiation cryochemistry of cubic ice; Kriochemia radiacyjna lodu kubicznego

No abstract prepared

1998-01-01

205

Production of reducing oligosaccharides from galactan biopolymers

No abstract prepared

1998-12-31

206

Present status of containment integrity tests at NUPEC

No abstract prepared.

2006-07-01

207

Preparation of colloidal silver nanoparticles in poly(N-vinylpyrrolidone) by ?-irradiation

No abstract prepared.

2000-11-01

208

Preliminary calculations for MOX fuel critical experiments in TCA

Not Available

2008-09-01

209

Predictive maturity of computer models using functional and multivariate output

No abstract prepared.

2000-01-01

210

Power plants: future will be safe; Kraftwerke: Zukunft in Sicherheit

No abstract prepared.

2008-01-01

211

Ports close hauled; Haefen hart am Wind

No abstract prepared.

2006-08-15

212

Plasma nitriding of ASTM F138 biomaterial - corrosion study

No abstract prepared.

2010-11-15

213

Planning for an Integrated Program of Scientific Research on Global Environmental Change

No abstract prepared.

2006-07-01

214

Pipe whip transient analysis of the ignalina NPP.

No abstract prepared.

2003-07-08

215

Performance of the central calorimeter of the COSY-TOF detector

No abstract prepared.

2002-05-15

216

Pectins from medicinal plants and their anti-ulcer activity

No abstract prepared.

2002-03-01

217

PREPARATION METHOD OF POLYMER-SUPPORTED CHIRAL ZIRCONIUM CATALYST

No abstract prepared.

2008-07-01

218

J-STORE (Japan)

Full Text Available

2008-09-26

219

On the determination of the equilibrium melting temperature of polybutylene terephthalate (PBT)

On duality of the noncommutative supersymmetric Maxwell-Chern-Simons theory

No abstract prepared.

2004-07-01

220

Nuclear safety and international governance. Russia and Eastern Europe

No abstract prepared.

2008-07-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

221

New technologies for managing oil field wastes.

No abstract prepared

1999-06-01

222

Neutron activation analysis of ultra-trace elements. 2

No abstract prepared.

2000-10-25

223

Monitoring of the relative beam polarization at COSY-11

No abstract prepared

1998-01-01

224

Mobile Smart Meter; Mobile Smart Meter

No abstract prepared.

2002-03-01

225

Migration behavior of trace elements with geothermal sources

No abstract prepared.

2010-06-15

226

Microorganisms elimination in antiquity paper by gamma irradiation

No abstract prepared

1998-01-01

227

Metal dusting induced pitting in Alloy 800.

No abstract prepared.

2002-07-01

228

Mechanisms behind the rise and fall of sideflow at SIS energies

NO abstract prepared.

2005-01-01

229

Measurement of crack growth rate of magnesium alloy AZ31

No abstract prepared.

2002-07-01

230

MECHANICAL DESIGN OF THE SPALLATION NEUTRON SOURCE COUPLED CAVITY ACCELERATOR

No abstract prepared.

2005-07-01

231

Learning from Europe; Lernen von Europa

No abstract prepared.

2001-06-01

232

Large interaction of cytochrome-c with cardiolipin/DPPC vesicles by SAXS

No abstract prepared.

2010-09-15

233

LOS ALAMOS PLUTONIUM FACILITY WASTE MANAGEMENT SYSTEM

No abstract prepared.

2008-11-15

234

Kevlar and carbon composite body armor - analysis and testing.

No abstract prepared.

2000-01-01

235

Investigation of the a{sub 0}{sup +}(980) resonance at ANKE

No abstract prepared.

2005-07-01

236

International Workshop of the Physics of Compressible Turbulent Mixing

No abstract prepared.

2002-03-01

237

Influence of irradiation on thermally stimulated current in PEEK

No abstract prepared.

2001-11-28

238

Induction of self-compatible buckwheat by ion beams

No abstract prepared

1998-01-01

239

InP-quantum dots in AlGaInP

No abstract prepared.

2003-03-01

240

Implementation of a new data acquisition system at COSY-TOF

No abstract prepared.

2006-07-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

241

Hydrogen Systems Analysis, Education, and Outreach Activities

No abstract prepared.

2002-03-01

242

Heat transfer augmentation in channels with porous copper inserts.

No abstract prepared.

2000-02-02

243

Gluing Feynman diagrams in NDIM: insights into the three-point vertex

No abstract prepared.

1998-05-19

244

Geothermal Heat Pump Design Tool Benchmarking

No abstract prepared.

2008-07-01

245

Formation of Stable Chlorinated Hydrocarbons in Weathering Plant Material

No abstract prepared.

2000-08-01

246

Fly Ash Amendments Catalyze Soil Carbon Sequestration

No abstract prepared.

2005-08-22

247

First experiments with the Rossendorf Si-ball RoSiB

No abstract prepared.

2003-09-15

248

Final Report - Summary of Executive Policy Forum on Electricity Restructuring

No abstract prepared

1999-10-01

249

Fast Flux Test Facility (FFTF) Shutdown Activities

No abstract prepared.

2001-04-01

250

Fast Flux Test Facility (FFTF) Background & Status

No abstract prepared.

2001-06-01

251

Experimental and numerical study of colloid transport in a single fracture.

No abstract prepared.

2001-06-01

252

Eta-nucleus final state interaction studies

No abstract prepared.

2005-02-01

253

Eta-nucleus bound state study and the detector ENSTAR

No abstract prepared.

2002-03-01

254

Estimation of the radiation damages of the Uppsala spectator detector

No abstract prepared.

2002-03-01

255

Epigenetic changes accompanying human mammary epithelial cell Immortalization

No abstract prepared.

2002-03-01

256

Electromagnetic excitations in nuclei: From photon scattering to photo-dissociation

No abstract prepared.

2000-10-03

257

Efficiency of the second scintillator plane of the ANKE forward detector

No abstract prepared.

2006-07-01

258

Determination of the ANKE forward detector MWPC efficiency

No abstract prepared.

2002-03-01

259

DENSITY ANOMALIES IN THIN LIQUID FILMS OF HYDRIDE FUNCTIONAL SILOXANES

No abstract prepared.

2002-03-01

260

Content and distribution of hydrogen in anodic alumina films

No abstract prepared.

2002-01-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

261

Conserved currents and dualities in a covariant phase-space dynamics

No abstract prepared

1998-01-01

262

Computer model improves real-time management of water quality

No abstract prepared.

2007-07-01

263

Complex geometry, duality and non-perturbative structures in superstring theory

No abstract prepared.

1999-07-21

264

Combinatorial Spray-Based Synthesis of PEM FC Electrocatalysts

No abstract prepared.

1998-07-01

265

Close-to-threshold {phi} production at COSY-11

No abstract prepared.

2003-11-02

266

Chemical solution deposition of PLZT films on base metal foils.

No abstract prepared.

2002-03-01

267

Characterization of crystalline structure of electrodeposited ZnO thin films

No abstract prepared.

2003-11-07

268

CATALYSTS FOR HIGH CETANE ETHERS AS DIESEL FUELS

No abstract prepared.

2010-07-01

269

Biological Surface-Active Substance

No abstract prepared.

1999-09-01

270

International Science & Technology Center (ISTC)

Development of biological preparation with surfactant activity

271

Biogas in the natural gas grid; Biogas im Erdgasnetz

Arabinogalactans isolated from the medicinal plant Maytenus ilicifolia

No abstract prepared.

2007-03-15

272

An X-ray and neutron reflectometry study of multilayers

No abstract prepared.

2006-07-01

273

Advanced Direct Liquefaction Concepts Program Phase II

No abstract prepared.

1998-09-01

274

Acidic heteroxylans from medicinal plants and their antiulcer activity

No abstract prepared.

2002-11-30

275

ASC HPEMS Xyce circuit simulator : linear solver technology.

No abstract prepared.

2008-07-01

276

A review of in-situ chemical oxidation and heterogeneity

No abstract prepared.

2004-06-01

277

A review of Monte Carlo criticality calculations - convergence, bias, statistics

No abstract prepared.

2003-02-03

278

A precision experiment to measure the {eta}-meson mass

No abstract prepared.

2008-01-01

279

A Technology Roadmap for Generation IV Nuclear Energy Systems

No abstract prepared.

2002-03-01

280

A Study on the Preparation of Tritium Luminous Compound

No abstract prepared.

2002-12-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

281

A Guide to Experimental Elementary Particle Physics Literature 1994-1998

Full Text Available

1972-12-01

282

14 MeV neutron irradiation effects on window materials

No abstract prepared.

1999-10-01

283

Preparation of carrier-free yttrium-88 from strontium target by solvent extraction

No abstract prepared

1998-01-01

284

Abrasion problems in coal preparation

... carrier-free isotopes chemical preparation gamma spectra isotope production

285

In-situ growth of porous alumino-silicates and fabrication of nano-porous membranes

Lining of fused cast basalt tiles is recommended for various pieces of equipment constituting a coal preparation plant.

1981-01-01

286

Studies of the fundamental nature of catalytic acidity, sites, and intermediates: Progress report for period August 1, 1987-July 31, 1988

Feasibility of depositing continuous films of nano-porous alumino-silicates, primarily zeolites and MCM-41, on metallic and non-metallic substrates was examined with an aim to develop membranes for separation of gaseous mixtures and also for application as hydrogen storage material. Mesoporous silica was deposited in-side the pores of these nano-porous disks with an aim to develop membranes for selective separations. Our study involves supported zeolite film growth on substrates using in-situ hydrothermal synthesis. Faujasite, Silicalite and Mesoporous silica have been grown on various metallic and non-metallic supports. Metallic substrates used for film growth included anodized titanium, sodium hydroxide treated Titanium, Anodized aluminum, and sintered copper. A non-metallic substrate used was nano-porous aluminum oxide. Zeolite film growth was characterized using Scanning Electron Microscope (AMRAY 1820) and High ...

2009-01-01

287

Selective oxidations on vanadiumoxide containing amorphous mixed oxides (AMM-V) with tert.-butylhydroperoxide

Neopentane, because of its unique structural features, was found to be a useful probe for the assay of the acidity of various zeolites. The C-C bond was attacked by catalyst protons yielding CH/sub 4/ and the isobutyl carbenium ion in equal quantities. The latter either decomposed to produce isobutene or underwent secondary reactions. New avenues for reaction were opened with isobutane. The reaction of the Bronsted protons with the tertiary CH bonds produced H/sub 2/ and the same isobutyl carbenium ion. Hydride ion transfer of the same tertiary hydrogen to existing carbenium ions also occurred and the results showed that about half of the reaction was carried by this pathway. As with Neopentane, the C-C bond could also be attacked yielding the sec-propyl carbenium ion. These tools are being further developed.

1988-06-01

288

Quantum-chemical investigation of mechanism of dehydroxylation of crystalline and amorphous aluminosilicates

The catalytic oxygen transfer properties of vanadium containing zeolites and vanadium based sol-gel catalysts with hydrogen peroxides are well known. The severe problem of vanadium leaching caused by the presence of the by-product water has been addressed. To avoid any interference with homogeneously catalyzed reactions, our study focusses on selective oxidations in a moisture-free medium with tert.-butylhydroperoxide. We have investigated the catalytic properties of amorphous microporous materials based on SiO{sub 2}, TiO{sub 2}, ZrO{sub 2} and Al{sub 2}O{sub 3} as matrix material and studied the effects of surface polarity on the oxidation of 1-octene and cyclohexane. (orig.)

1998-12-31

289

Process for the recirculation of nitrogen oxides

Within the framework of the cluster approach and the semiempirical SCF MO LCAO method in the CNDO/BW valence approximation, possible pathways have been compared for the dehydroxylation of aluminosilicate systems. It has been shown that dehydroxylation as a result of splitting of a water molecule from an acidic bridge hydroxyl group and a more basic terminal group Al-OH is the most energyfavorable. Apparently, such a dehydroxylation pathway is primarily characteristic for amorphous aluminosilicates. Typical of crystalline aluminosilicates at moderate heat-treating temperature is dehydroxylation through splitting of a water molecule from an acidic bridge hydroxyl group and a neutral Si-OH group; at higher temperatures, there is a possible pathway of dehydroxylation of highsilica zeolites as a result of condensation of two acidic surface hydroxyls.

1986-07-01

290

Pretreatment of empty palm fruit bunch for production of chemicals via catalytic pyrolysis

The invention is regeneration and recirculation of nitrogen oxides in the exhaust gas of a nitric acid plant without using any material current and heat energy other than that generated in the process of producing nitric acid. Nitrogen oxide is recovered by at least two adsorbers each containing an acid resistant zeolite molecular sieve and operating in an alternate heat cycle; adsorption occurring at 20-40 degrees C and regeneration at 300-350 degrees C. The hot gas exiting from the oxidation U used in the production of nitric acid is used to regenerate the adsorbers and the nitrogen oxides set free during the said regeneration are introduced into the main feed stream of the nitric acid plant. In the final stage of the regeneration the adsorbers are cooled by rinsing them with exhaust gas or air at a temperature of 20-40 degrees C.

1983-01-04

291

British Library Electronic Table of Contents (United Kingdom)

The effect of chemical pretreatments using NaOH, H2O2, and Ca(OH)2 on Empty Palm Fruit Bunches (EPFB) to degrade EPFB lignin before pyrolyis was investigated. Spectrophotometer analysis proved consecutive addition of NaOH and H2O2 decomposed almost 100% of EPFB lignin compared to 44% for the Ca(OH)2, H2O2 system while NaOH and Ca(OH)2 used exclusively could not alter lignin much. Next, the pretreated EPFB was catalytically pyrolyzed. Experimental results indicated the phenolic yields over Al-MCM-41 and HZSM-5 catalysts were 90wt% and 80wt%, respectively compared to 67wt% yield for the untreated sample under the same set of conditions. Meanwhile, the experiments with HY zeolite yielded 70wt% phenols.

2009-01-01

292

Nuclear analytical techniques in Cuban sugar industry

Non-oxidative removal of hydrogen sulfide from gaseous, petrochemical, and other streams

This paper is a review concerning the application of Nuclear Analytical Techniques in the Cuban sugar industry. The most complete elemental composition of final molasses (34 elements) and natural zeolites (38) this last one employed as an auxiliary agent in sugar technological processe4s has been performed by means of instrumental Neutron Activation Analysis (INAA) and X-Ray Fluorescence Analysis (XRFA). The trace elemental sugar cane soill-plant relationship and elemental composition of different types of Cuban sugar (raw, blanco-directo and refine) were also studied. As a result, valuable information referred to the possibilities of using these products in animal and human foodstuff so as in the other applications are given. (author). 34 refs., 6 figs., 1 tab.

1997-12-01

293

Nomographs for the rapid prediction of salt quality and influent water quality impacts on hardness leakage in steamflood water

This patent describes a method of reducing the hydrogen sulfide level in streams containing hydrogen sulfide at concentrations from about 2 ppm up to about 1,000 ppm. It comprises reacting the hydrogen sulfide with an unsaturated hydrocarbon in the presence of an acidic solid catalyst selected from the group consisting of polymeric sulfonic acid resins, solid polyphosphoric acid, supported sulfuric acid, supported boric acid, silica-aluminas, clays, faujasite, mordenite, and L, omega, X or Y zeolites at mercaptan-forming concentrations, and recovering a stream having a reduced hydrogen sulfide concentration and containing no more than 5 ppm hydrogen sulfide.

1991-07-23

294

Evaluation of CO2 adsorption capacity of solid sorbents

Counter-current regeneration of 2-stage sodium zeolite softeners has been employed in reducing hardness leakage level of steamflooding water to less than 1 ppm when raw water contains as much as 5,000 ppm of the total dissolved solids. Hardness leakage is caused by sodium displacement of calcium and magnesium from the bottom of the exchanger bed. This study presents nomographs providing for rapid calculations to be made, for which a convenient operational mode does not already exist. The nomographs relate the hardness leakage as a function of salt quality and influent water quality and present solutions for predicting the leakage level, salt quality requirement or the treatability of raw water required for steamflooding projects.

1982-08-01

295

British Library Electronic Table of Contents (United Kingdom)

The CO2 adsorption capacity of the low-cost solid sorbents of waste tire char (TC) and chicken waste char (CW) was compared with commercial active carbon (AC) and 5?? zeolite (ZA) using thermogravimetric analysis (TG), pressurized TG, and differential scanning calorimetry (DSC). The sorbents were degassed in a TG up to 150??C to release all gases on the surface of the sample, then cooled down to the designed temperature for adsorption. TG results indicated that the CO2 adsorption capacity of TC was higher than that of CW, but lower than those of AC and ZA. The maximum adsorption rate of TC at 50??C was 0.61% min?1, lower than that of AC, but higher than that of CW, 0.44% min?1. The maximum adsorption rate of ZA at 50??C was 3.1% min?1. When the pressure was over 4?bar, the adsorption rate ...

2011-01-01

296

FFTF operations procedures preparation guide. Revision 2

Recycle of iodine-loaded silver mordenite by hydrogen reduction

The Guide is intended to provide guidelines for the initial preparation of FFTF Operating Procedures. The Procedures Preparation Guide was developed from the plan presented and approved in the FFTF Reactor Plant Procedures Plan, PC-1, Revision 3.

1976-12-01

297

Isobutane/2-butene alkylation over potential heterogeneous catalysts in a slurry reactor

In 1977 and 1978, workers at Idaho National Engineering Laboratory (INEL) developed and tested a process for the regeneration and reuse of silver mordenite, AgZ, used to trap iodine from the dissolver off-gas stream of a nuclear fuel reprocessing plant. We were requested by the Airborne Waste Management Program Office of the Department of Energy to perform a confirmatory recycle study using repeated loadings at about 150/sup 0/C with elemental iodine, each followed by a drying step at 300/sup 0/C, then by iodine removal using elemental hydrogen at 500/sup 0/C. The results of our study show that AgZ can be recycled. There was considerable difficulty in stripping the iodine at 500/sup 0/C.; however, this step went reasonably well at 550/sup 0/C or slightly higher, with no apparent loss in the iodine-loading capacity of the AgZ. Large releases of elemental iodine occurred during the drying stage and the early part of the stripping stage. Lead zeolite, which was ...

1982-11-01

298

Diffusion and adsorption of methane confined in nanoporous carbon aerogel: a combined quasi-elastic and small-angle neutron scattering study

The trend towards more effective use of fossil fuels and reduced environmental pollution represents a major task of improvement within the refinery processes. The highly isomerized and high octane paraffins produced from isobutane and light olefins by alkylation fulfill all the requirements for reformulated gasoline. This doctoral thesis discusses new catalyst systems because of their potential in alkylation. A slurry reactor apparatus for solid-acid catalysed isobutane/butene alkylation was developed and used to investigate the performance of various heterogeneous catalysts. The selected materials were mainly zeolite types with faujasite structures. The samples were characterized by various methods before alkylation. In general, the order of decreasing catalyst activity after 3 h of reaction at 80{sup o}C was found to be: H-EMT >> H-FAU, dealuminated H-FAU >> NS.500, TA-Y, CeY-98 > Nafion-H. The order of decreasing alkylate selectivity of the ...

1996-12-31

299

Catalysis on Mo(CO)/sub 6/-derived supported molybdenum catalysts: CO oxidation with N/sub 2/O

The diffusion of methane confined in nano-porous carbon aerogel with the average pore size 48 {angstrom} and porosity 60% was investigated as a function of pressure at T = 298 K using quasi-elastic neutron scattering (QENS). The diffusivity of methane shows a clear effect of confinement: it is about two orders of magnitude lower than in bulk at the same thermodynamic conditions and is close to the diffusivity of liquid methane at 100 K (i.e. {approx} 90 K below the liquid-gas critical temperature T{sub C} {approx} 191 K). The diffusion coefficient (D) of methane initially increases with pressure by a factor of {approx}2.5 from 3.47 {+-} 0.41 x 10{sup -10} m{sup 2} s{sup -1} at 0.482 MPa to D = 8.55 {+-} 0.33 x 10{sup -10} m{sup 2} s{sup -1} at 2.75 MPa and starts to decrease at higher pressures. An explanation of the observed non-monotonic behavior of the diffusivity in the confined fluid is based on the results of small-angle neutron scattering experiments of the phase behavior of ...

2010-04-01

300

The catalytic nature of Mo(CO)/sub 6/ supported on ..gamma..-Al/sub 2/O/sub 3/, KOH-doped ..gamma..-Al/sub 2/O/sub 3/, and HY-zeolite was investigated in CO oxidation with N/sub 2/O in comparison with that of a conventional partially reduced MoO/sub 3//..gamma..-Al/sub 2/O/sub 3/ catalyst. Kinetic parameters of this reaction were obtained in the range 0 to 100/sup 0/C; the rate law r = kP/sub N/sub 2/O//sup 1/P/sub CO//sup 0/ was found on all catalysts, and the activation energy was estimated to be 9.1 kcal/mol on the Mo(CO)/sub 6/-derived catalysts and 7.1 kcal/mol on the partially reduced MoO/sub 3//..gamma..-Al/sub 2/O/sub 3/ catalyst. Maximum catalytic activities were obtained by activating the Mo(CO)/sub 6/-derived catalysts at 400/sup 0/C. To obtain similar activity on the MoO/sub 3//..gamma..-Al/sub 2/O/sub 3/ catalyst, it was necessary to reduce at 600/sup 0/C. The former catalysts were deactivated on repeating the reaction. On the basis of these results ...

1988-05-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

301

United ttsCos ur

The International Reference Preparation of Erythropoietin*

... floppy diskette message preparation - JANAP 128 and DD173 message preparation ... S including JANAP 128, DD173, and ACP 126. ...

2011-05-05

302

SOLID STATE RESEARCH OF THE APPLIED PHYSICS ...

The WHO Expert Committee on Biological Standardization authorized the National Institute for Medical Research to establish an International Reference Preparation of Erythropoietin on the basis of the...Full Text Available

1966-01-01

303

Preparation of covalently modified organic-inorganic composite nanoparticles and their interfacial electron transfer researches

... 10 TIN TELLURIDE Preparation of Tin Telluride Single Crystals ..... 12 ... TIN TELLURIDE Preparation of Tin Telluride Single Crystals ...

1962-07-16

304

CERN Document Server

Preparation of covalently modified organic-inorganic composite nanoparticles and their interfacial electron transfer researches

1998-01-01

305

Method for preparing thermally cleavable surfactants without deprotonation

Grit-Blast/Silane (GBS) Aluminum Surface Preparation for ...

The present invention describes surfactants of formula (I), ##STR00001## wherein R, R.sub.N, and m are defined herein, processes for their preparation, and methods for their decomposition.

2008-05-27

306

Exploration of Cold Extrusion for the Preparation of Enteric Minitablets of Isoniazid

... GRIT-BLAST/SILANE (GBS) ... GRIT-BLAST/SILANE (GBS) ALUMINUM SURFACE PREPARATION FOR STRUCTURAL ADHESIVE BONDING 5b. ...

2003-04-30

307

Defense.gov News Article: Task Force Prepares for Horn of ...

The objective of the present work was to formulate the enteric minitablets of isoniazid by cold extrusion method. The minitablets were prepared using isoniazid, hydroxylpropylmethylcellulose phthalate...Full Text Available

2008-05-01

308

Advanced Technological Education Program: 1999 Awards and Activities

... After the task force deploys, Joint Forces Command interacts ... and what needs tweaking to better prepare future headquarters staffs, Mungus ...

309

{sup 13}C-NMR signal enhancement by using parahydrogen induced polarization (PGIP) and appropriate pulse sequences

... By developing and disseminating educational materials and curricula, supporting the preparation and ... education, such as curriculum or educational materials development, faculty or teacher preparation ...

310

Wrap-around pressure mitigation using Kevlar safety netting in high explosive processing facilities

No abstract prepared.

2009-07-01

311

Vibration tests on nuclear power station stacks equipped with structural control oil dampers

No abstract prepared.

2008-01-01

312

Using evidence-based logic to design investigations for clay barrier systems

No abstract prepared.

2009-07-01

313

Usefulness of CT colonography in the preoperative evaluation of patients with distal occlusive colorectal carcinoma

No abstract prepared.

2002-07-01

314

Use of cozilat preparation as enteral nutrition for patients with late radiation injuries of colon

No abstract prepared.

2002-02-15

315

Ultraviolet dosimetry characterization from calcium doped borate glass-ceramic

Short note.

1988-06-28

316

Twin Cities Army Ammunition Plant soil vapor extraction system : a post-audit modeling study.

No abstract prepared.

2006-07-01

317

Transformation of sulfur-containing organometallic complexes by free radicals formed in radiolysis of organic compounds

No abstract prepared.

2000-11-27

318

The structure of the 4.743 MeV state in {sup 88}Sr

No abstract prepared

1998-01-01

319

The sputtering deposition - CdTe/(Si, Gaas, Al{sub 2}O{sub 3})

No abstract prepared

1999-05-01

320

The progression from ionic to covalent bonding in disordered systems as studied by using neutron diffraction

No abstract prepared

1996-12-31

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

321

The non-equivalence between non-Abelian self-dual and Yang-Mills-Chern-Simons models

No abstract prepared

1998-12-31

322

The interaction zone of a {gamma}{gamma} collider at TESLA; Die Wechselwirkungszone eines {gamma}{gamma}-Colliders bei TESLA

No abstract prepared.

2008-07-01

323

The human melanocyte: A model system to study the complexity of cellular aging and transformation in non-fibroblastic cells

No abstract prepared.

2003-07-01

324

The half-life of {sup 101}Mo and {sup 101}Tc {beta}{sup -} decay

No abstract prepared.

2002-05-23

325

The coordination chemistry of technetium and rhenium and applications to nuclear medicine. Final report

No abstract prepared.

2008-07-01

326

The Structures and Optical Spectra of Hydrated Transplutonium Ions in Solid State and in Solution

No abstract prepared.

1996-12-31

327

Testing a passive revegetation approach for restoring coastal plain depression wetlands

No abstract prepared.

2007-06-01

328

Temporal Fluctuations of Fluorescence Energy Transfer between TwoDyes Conjugated to a Single Protein

No abstract prepared.

2006-01-01

329

TEMPERATURE-DEPENDENT DIELECTRIC MEASUREMENTS OF POLYACRYLONITRILE FIBERS DURING AIR OXIDATION (Paper)

No abstract prepared.

1999-01-04

330

Synthesis and structure of the (tetrahydroxy)oligosiloxane [(tBuO)3SiOSi(OH)2]2O

No abstract prepared.

2004-01-26

331

Study on the ageing process of the proportional counters; Badanie mechanizmu starzenia licznikow proporcjonalnych

No abstract prepared.

2000-01-25

332

Study of the Form Factor of the Proton in the Timelike Region for Large Momentum Transfers

No abstract prepared

1998-12-31

333

Study of nuclear fusion materials making use of ion irradiation and ESR microscope

No abstract prepared.

2001-01-01

334

Studies of {eta} production in proton proton collisions with the time of flight spectrometer

No abstract prepared

1998-01-01

335

Structure beyond Bragg : study of V{sub 2}O{sub 5} nanotubes.

No abstract prepared.

2002-03-01

336

Steam turbines for biomass power plants; Dampfturbinen fuer Biomasse-Kraftwerke

No abstract prepared.

2004-02-01

337

Status of the analysis of the (vector)pp {yields} pp{gamma} reaction channel

No abstract prepared.

2003-11-01

338

Stability of the ClO dimer; Stabilitaet des ClO-Dimers

No abstract prepared.

2002-03-01

339

Spent fuel sabotage aerosol ratio test program:status update, November 2004.

No abstract prepared.

2006-07-01

340

Spent fuel sabotage aerosol ratio test program : progress & status, May 2004.

No abstract prepared.

2004-11-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

341

Spent fuel sabotage aerosol ratio program : status, May 2005.

No abstract prepared.

2004-05-01

342

Speciation of metals in medicinal plants under different stress condition by HPLC-ICP-MS

No abstract prepared.

2005-05-01

343

Small Angle Neutron Scattering and Calorimetric Studies of Large Unilamellar Vesicles of the Phospholipid Dipalmitoylphosphatidylcholine

No abstract prepared.

2005-07-01

344

Slide Rule for Rapid Response Estimation of Radiological Dose from Criticality Accidents

No abstract prepared.

1999-03-01

345

Singlet-to-triplet ratio in the deuteron breakup reaction pd{yields}pnp at 585 MeV

No abstract prepared.

1999-06-03

346

Shortwave transport in the cloudy atmosphere by anomalous/levy diffusion: New diagnostics using Forte Data

No abstract prepared.

2002-03-01

347

Short-term radon concentration measurements in Dwellings in the metropolitan region of Belo Horizonte, Brazil

No abstract prepared.

2000-10-01

348

Search for magnetic rotation in {sup 202}Pb and {sup 203}Pb

No abstract prepared.

2010-07-01

349

Search for a quasi-bound {eta}-{sup 3}He state with the COSY-TOF spectrometer

No abstract prepared.

2000-07-24

350

SYNCHROTRON X-RAY DIFFRACTION STUDY OF THE STRUCTURE AND DEHYDRATION BEHAVIOR OF TODOROKITE

No abstract prepared.

2002-03-01

351

STRUCTURAL CHARACTERIZATION OF THIN HYDROXYPROPYLCELLULOSE FILMS. X-RAY REFLECTIVITY STUDIES

No abstract prepared.

2003-01-01

352

SODIUM HEAT PIPE MODULE TEST FOR SAFE-30 REACTOR PROTOTYPE

No abstract prepared.

2004-01-01

353

SAXS studies of the injection molding effects on the nanostructure of polyesters. I. Polybutylene terephthalate (Pbt)

No abstract prepared.

2000-10-01

354

Rupture of anomalous composite particles prepared by seeded emulsion polymerization in aging period

No abstract prepared.

2004-07-01

355

Relationship between HF permittivity and microscopic fluid distribution in clayey geo-materials

Not Available

1980-07-01

356

Reaction-diffusion effects on species mixing rates in turbulent premixed methane-air combustion

No abstract prepared.

2002-07-01

357

Radionuclide X-ray fluorescence method of determination of toxic metal content in environment objects

No abstract prepared.

2009-06-01

358

Radiative processes as a condensation phenomenon and the physical meaning of deformed canonical structures

No abstract prepared.

2004-07-01

359

Radiation processing used in forestry in Thailand

No abstract prepared.

2008-07-01

360

RESPONSE TO THE CHALLENGES OF TECHNOLOGICAL CHANGE ON A SAFEGUARDS EQUIPMENT SUPPORT ORGANIZATION: DESIGN OF A PERFORMANCE-BASED TRAINING PROGRAM.

A summary is presented of research being carried out in Thailand on the preparation of irradiation-impregnated wood.

1981-01-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

361

Quality Assurance in Safeguards: Indonesian Document Control and Records Management System

No abstract prepared.

2000-07-16

362

Pulsations in the compression chamber, a potential cause of damage?; Pulsationen im Verdichtungsraum - eine potentielle Schadensursache?

No abstract prepared.

2010-07-01

363

Protein-protein interactions and structural analysis of citrus proteins involved in transcriptional control during citrus canker disease

No abstract prepared.

2005-05-01

364

Properties of Polyacrylonitrile/Single Wall Carbon Nanotube Composite Films Prepared in Nitric Acid

No abstract prepared.

2010-07-01

365

Proceedings of the North Atlantic Submarine Canyons Workshop : February 7-9, 1989 / prepared for the Minerals ...

Full Text Available

2005-06-01

366

Preparation, characterization and photocatalytic activity of the neodymium-doped TiO2 hollow spheres

Language: English ...

367

Preparation of the Nano Cobalt Powder by Wet Chemical Reduction Method

Not Available

2010-10-01

368

Preparation of Porous Mullite Composites through Recycling of Coal Fly Ash

Full Text Available

2011-06-01

369

Preparation of Polymer-modified Mortars with Recycled PET and Their Sound Absorption Characteristics

Full Text Available

2010-03-01

370

Preparation of Poly (acrylonitrile)/Poly (pyrrole) Composite and Its Mechanical Properties

Full Text Available

2010-09-01

371

Preparation of Activated Carbon Fiber-Ceramic Composites and Its Physical Properties

Full Text Available

1990-06-01

372

Preparation and Physicochemical Properties of Chitosan from Red Crab Waste-Shell

Full Text Available

1997-01-01

373

Plasma nitriding of ASTM F138 stainless steel at different pressures

Full Text Available

2001-03-01

374

Phytochemical study of Tynanthus fasciculatus (Bignoniaceae); Estudo fitoquimico de Tynanthus fasciculatus (Bignoniaceae)

No abstract prepared.

2009-07-01

375

Phenomenological analysis of K{sup +}-meson production in proton-nucleus collisions

No abstract prepared.

2005-07-01

376

PV Conversion Technologies; Session: OPV, Sensitized, Seed Funds (Presentation)

No abstract prepared.

2002-03-01

377

PROPERTIES AND PERFORMANCE OF CEMENT-BASED GROUTS FOR GEOTHERMAL HEAT PUMP APPLICATIONS.

No abstract prepared.

2008-04-01

378

Optimized filtration enhances oil-injected compressors; Optimierte Filtration verbessert oeleingespritzte Kompressoren

No abstract prepared.

1999-09-30

379

Optimization of the spectator detector arrangement for the pn {yields} pn{eta}' measurements at COSY-11

No abstract prepared.

2009-09-14

380

Online monitoring of pollen - development of a novel technique and first results of field experiments

No abstract prepared.

2002-03-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

381

On the combination of two dimensional Sn transport calculation and Monte Carlo calculation

No abstract prepared.

2005-07-01

382

Oil-injected compressors for energy saving; Verlustarmes Schraubenprofil. Oeleingespritzte Kompressoren zum Energiesparen

No abstract prepared.

2001-01-01

383

Occult brain metastases in HER2-positive breast cancer patients: Frequency and response to radiotherapy

No abstract prepared.

2008-05-13

384

Obtainment of lanthanum oxide by fractionated precipitation method

No abstract prepared.

2007-10-15

385

Obsidian under fire: considering the role of raw material variation in obsidian hydration analysis

... ammonium compounds benzilic acid chemical preparation lanthanum oxides

1979-01-01

386

Novel Tetracycline Resistance Determinant Isolated from an Environmental Strain of Serratia marcescens

No abstract prepared.

2000-07-01

387

Novel Antidrugabuse Peptide

No abstract prepared.

2007-01-01

388

International Science & Technology Center (ISTC)

Natural Biologically Active HLDF6 Peptide as Potential Preparation for Correction of Different Drugabuse Forms

389

Nitrogen accumulation in clays: solid-solution equilibrium and risk of gas generation

New tissue equivalent bolus useful in preventing of infection and invironmental pollution for radiotherapy

No abstract prepared.

2002-07-01

390

New paradigm : controlling initiation phase is necessary for optimization of wire-array z-pinch performance.

No abstract prepared

1999-03-01

391

New applications for pumps without shaft seals; Neue Einsatzgebiete fuer wellendichtungslose Pumpen

No abstract prepared.

2008-08-01

392

NMR assignment of the cAMP-binding domain A of the PKA regulatory subunit

No abstract prepared.

2005-05-01

393

N=2 supersymmetric radiation damping in an external electromagnetic field, noncommutativity and duality

No abstract prepared.

2006-12-15

394

Multinuclear Magnetic Resonance and X-ray Crystallographic Investigation of Some Mixed Ligand Alkylisocynaide Platinum(Ii) Complexes

No abstract prepared.

2008-07-01

395

Multi Canister Overpack (MCO) Topical Report [SEC 1 and 2

No abstract prepared.

2005-08-01

396

Morphology and Properties of Polyacrylonitrile/Na-MMT Nanocomposites Prepared via in-situ Polymerization with Macroazoinitiator

No abstract prepared.

1999-12-16

397

Modernization concepts for older steam turbines. Economic advantages; Modernisierungskonzepte fuer aeltere Dampfturbinen. Wirtschaftliche Vorteile

Full Text Available

2006-06-01

398

Micro-Fabricated Thin-Film Fuel Cells for Portable Power Requirements

No abstract prepared.

2003-10-20

399

Mechanistic aspects of fracture and R-curve behavior in human cortical bone

No abstract prepared.

2002-03-21

400

Measurement of W-Boson Helicity Fractions in Top-Quark Decays Using costheta*

No abstract prepared.

2005-06-24

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

401

Magnetic properties of single crystalline RE{sub 2}PdSi{sub 3} intermetallic compounds

No abstract prepared.

2008-11-01

402

MPIRSPT : a parallelized all-electron DFT program for lanthanide and actinide calculations.

No abstract prepared.

2005-07-01

403

METHOD FOR SYNTHESIZING DERIVATIVE, COMPOUND LIBRARY AND METHOD FOR PREPARING THE SAME AND METHOD FOR SCREENING

No abstract prepared.

2008-08-01

404

J-STORE (Japan)

Full Text Available

2006-04-28

405

MANAGING WASTE AT LOS ALAMOS NATIONAL LABORATORY'S PLUTONIUM FACILITIES

Luminosity determination at COSY-11 using the proton-deuteron elastic scattering

No abstract prepared.

2000-01-01

406

Lipid Compositions Changes of Seasoned Pork Prepared with Medicinal Plant Extracts During Storage

No abstract prepared.

2002-03-01

407

Laser Spectroscopy: Assessment of Research Needs for Laser Technologies Applied to Advanced Spectroscopic Methods

Full Text Available

2007-12-01

408

LLNL inductrack progress report - February 99 through November 99

No abstract prepared.

1990-05-01

409

Iron in cookies prepared with fortified flour

No abstract prepared.

2000-03-08

410

Investigations and development of gaseous radiation detectors; Badania i rozwoj konstrukcji gazowych detektorow promieniowania

... Italy) Istituto Superiore di Sanita (Italy) 207 p. ENVIRONMENTAL SCIENCES

2009-04-01

411

Investigation of the pp {yields} nK{sup +}{sigma}{sup +} reaction

No abstract prepared

1998-12-31

412

Introduction of air pollution abatement measures in Germany; Einfuehrung von Klimaschutzmassnahmen in Deutschland

No abstract prepared.

2002-03-01

413

Insight into the output of reverse-time migration: what do the amplitudes mean?

No abstract prepared

1998-12-31

414

Influence of neutron-core excitations on high-spin states in {sup 88}Sr

No abstract prepared.

2005-05-01

415

Induced deformation of the canonical structure and UV/IR duality in (1 + 1)D

No abstract prepared.

2001-04-01

416

Individually adapted examination protocols for reduction of radiation exposure in chest CT

No abstract prepared.

2008-07-01

417

In vitro evaluation of stent-graft prosthesis by contrast-enhanced MR angiography

No abstract prepared.

2002-02-01

418

Improved near surface seismic imaging by combining tomography and reverse time migration.

No abstract prepared.

2002-02-01

419

Identifying Contributing Degradation Phenomena in PEM Fuel Cell Membrane Electrode Assemblies Via Electron Microscopy

No abstract prepared.

2010-04-01

420

INTERRUPTED-GROWTH STUDIES OF THE SELF-ASSEMBLY OF INTRINSICALLY ACENTRIC SILOXANE-DERIVED MONOLAYERS

No abstract prepared.

2006-10-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

421

Hydromechanical response of jointed host granitic rock during excavation of the FEBEX tunnel.

No abstract prepared.

2003-01-01

422

Histological analysis of hyaluronic acid and decorin in solid subcutaneous walker 256 rat carcinoma

No abstract prepared.

2003-04-01

423

High-resolution infrared spectroscopy of {gamma}-ray irradiated solid parahydrogen

No abstract prepared.

1998-07-01

424

High-Performance SPICE Development Including an Analytical Transient Photocurrent BJT Model

No abstract prepared.

2002-09-01

425

High resolution line shapes of weak autoionizing resonances identified through fluorescence from the satellite states of Ar+

No abstract prepared.

2000-08-01

426

HIGH ORDER STATISTICAL SIGNATURES FROM SOURCE-DRIVEN MEASUREMENTS OF SUBCRITICAL FISSILE SYSTEMS

No abstract prepared.

1997-07-01

427

Geothermal progress monitor. Special supplement: proceedings of the geothermal program review

No abstract prepared.

1998-04-01

428

Gas sensing properties of polyacrylonitrile/metal oxide nanofibrous mat prepared by electrospinning

Separate abstracts were prepared for individual papers. (MHR)

1982-01-01

429

GaAs/(ordered) GaInP2 Heterostructures under Pressure and HighMagnetic Fields

Full Text Available

2008-07-01

430

Fresh air for the whole industry; Frischer Wind auf breiter Front

No abstract prepared.

1998-09-01

431

Fixed constituents of Bauhinia acuruana Moric; Constituintes fixos de Bauhinia acuruana Moric

No abstract prepared.

2010-06-15

432

First-principles investigation of Co wires at Pt(111) step-edges

No abstract prepared.

2010-07-01

433

First results of {pi}{sup 0}-{eta} mixing angle measurement

No abstract prepared.

2006-07-01

434

FY2003 Laboratory Directed Research and Development Program Annual Report

No abstract prepared.

2002-03-01

435

FAST FLUX TEST FACILITY (FFTF) FINAL SAFETY ANALYSIS REPORT AMENDMENT 83

No abstract prepared.

2004-07-30

436

Extended sectors of utilization by an advanced engineering. Utilization of wind power; Erweiterte Einsatzgebiete durch moderne Technik. Windenergienutzung

No abstract prepared.

2003-11-20

437

Extended molecular dynamics studies on {sup 40}Ca + {sup 40}Ca at 35A MeV

No abstract prepared.

2010-07-01

438

Exploring changes in solar model physics to mitigate the solar abundance problem

No abstract prepared

1997-12-31

439

Enhanced ion charge states in vacuum arc plasmas using a 'current spike' method

No abstract prepared.

2008-01-01

440

Enhanced and multiplexed detection via a novel RCA-aptamer based sensing system

No abstract prepared.

1999-07-01

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

441

Energy loss of titanium and copper ions in thin foils of gold at energies above Bragg's peak

No abstract prepared.

2006-09-06

442

Energy dependence of the pp {yields} ppK{sup +}K{sup -} total cross section close to threshold

No abstract prepared.

2005-07-01

443

Elemental content determination in leaves and extracts of Casearia medicinal plant by neutron activation analysis

No abstract prepared.

2002-03-01

444

Element specific defect investigation on Mg-alloys with coincident Doppler broadening spectroscopy

No abstract prepared.

2005-07-01

445

Electrical property and structure of diamond like carbon films prepared by IBAD

No abstract prepared.

2006-07-01

446

Electric cars. A reality for Ireland. Partnership of the Irish Government, ESB and Renault-Nissan

Short communication.

1995-12-31

447

Effects of season and body condition score on lipid metabolism and oxidative status of periparturient dairy cows

No abstract prepared.

2010-05-31

448

Effects of extracts of medicinal plants in the parasitaemia of Trypanosoma cruzi and in the biodistribution of the technetium-{sup 99m}

No abstract prepared.

2005-07-01

449

Effects of Coulomb and kaon nuclear potentials on soft K{sup +} production from nuclei

No abstract prepared.

2008-10-15

450

Effect of the medicinal plant Echinacea purpurea on the bioavailability of the radiopharmaceutical {sup 99M}TC-sodium pertechnetate

No abstract prepared.

2002-03-01

451

Effect of outside air ventilation rate on volatile organic compound concentrations in a call center

No abstract prepared.

2008-10-15

452

Effect of equal channel angular pressing on the deformation behaviour of magnesium alloy AZ31 under uniaxial compression

No abstract prepared.

2003-04-01

453

Effect of Chemical Treatment of Teflon Powder on the Properties of Polyamide 66/Teflon Composites Prepared by Melt Mixing

No abstract prepared.

2006-07-01

454

ESR spectroscopy of intermediate products of water radiolysis; Spektroskopia EPR produktow posrednich radiolizy wody

Full Text Available

2011-06-01

455

EM Wave Absorption Properties on Particle Size and Permeability of ferrite and Preparation Temperature in Absorbers for Mobile Phones

No abstract prepared

1998-12-31

456

Dynamic simulation of a pipe whip restraint; Simulation der Dynamik einer Ausschlagsicherung fuer eine Rohrleitung

Full Text Available

2004-04-01

457

Domain Bridging Interactions. A Necessary Contribution to the Function and Structure of 'Escherichia coli' Aspartate Transcarbamoylase

No abstract prepared.

1999-07-01

458

Discontinuous Galerkin Finite Element Method applied to the 1-D Spherical Neutron Transport Equation

No abstract prepared.

2001-01-01

459

Diagnostic Analysis of Silicon Photovoltaic Modules after 20--Year Field Exposure

No abstract prepared.

2005-11-07

460

Development of chemical separation in gas phase for heavy actinide and trans-actinide elements

No abstract prepared.

2000-09-25

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

461

Development of a dual serial-parallel multiphase CFD code for application to industrial combustor/reactor systems.

No abstract prepared

1998-01-01

462

Determination of metals in medicinal plants and soil from Amazon area by neutron activation analysis and ICP-MS

No abstract prepared.

2000-05-16

463

Decomposition of tar in pyrolysis gas by partial oxidation and thermal cracking. Part 2

No abstract prepared.

2005-07-01

464

Decay studies of rare-earth isotopes produced in the proton-induced fission

No abstract prepared

1998-12-31

465

DISCRETE SIMULATION OF REACTIVE AND NON-REACTIVE FLOW WITH LATTICE GAS AUTOMATA (LGA)

No abstract prepared

1998-01-01

466

Cryogenic heat pipe-target with aluminum condenser for the COSY-TOF experiment

No abstract prepared.

2000-01-01

467

Corrosion protection of onshore and offshore wind power systems; Korrosionsschutz von Windenergieanlagen Onshore and Offshore

No abstract prepared.

2002-03-01

468

Copper complexes of nonsteroidal anti-inflammatory drugs: An Opportunity yet to be realized

No abstract prepared.

2003-07-01

469

Contribution to the radiation preparation of wood-plastic materials. Pt. 7

No abstract prepared.

2002-01-01

470

Contribution to the radiation preparation of wood-plastic materials. Pt. 6

... odd nuclei organic compounds radiation effects radioisotopes synthesis

1974-01-01

471

Contribution to the radiation preparation of wood-plastic materials Pt. 3

... compounds polymers polyolefins polyvinyls radiation effects SYNTHESIS.

1974-01-01

472

Construction of REpower 5M; Errichtung der REpower 5M

... compounds plants radiation effects radioisotopes reaction kinetics trees

1974-01-01

473

Conduct of Operations Applicability Matrix for CMELS Low Hazard Facilities at LLNL Site 200

No abstract prepared.

2004-07-01

474

Conduct of Operations Applicability Matrix for CMELS Light Science and Industry and General Industry Facilities at LLNL Site 200

No abstract prepared.

2008-04-22

475

Computational analysis of candidate intron regulatory elements for tissue-specific alternative pre-mRNA splicing

No abstract prepared.

2008-04-22

476

Commentary on: Molecular basis for discriminating between normaland damaged bases by the human alkyladenine glycosylase, AAG

No abstract prepared.

2001-04-01

477

Climate change adaptation in coastal zones: Improving decision-making to support management strategies

No abstract prepared.

2001-03-05

478

Chemical and biological aspects of an arabinogalactan from the medicinal herb Phyllanthus niruri (quebra-pedra)

No abstract prepared.

2009-02-01

479

Charge station for electric cars; Ladestation versorgt Elektroautos einheitlich mit Strom

No abstract prepared.

2005-07-01

480

Central flat ventilation - an unfinished technology; Zentrale Wohnungslueftung - eine unfertige Technologie?

No abstract prepared.

2010-10-04

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

481

Building LAMMPS data files with car/mdf files and the msi2lmp utility.

No abstract prepared.

2003-10-01

482

Biocontrol Agents of Crops Diseases

No abstract prepared.

2010-03-01

483

International Science & Technology Center (ISTC)

Scale up of Technology for Production and Application of Rhizobacteria-Based Preparations as Biocontrol Agents of Crop Diseases

484

BONDING SELF-ASSEMBLED, COMPACT ORGANOPHOSPHONATE MONOLAYERS TO THE NATIVE OXIDE SURFACE OF SILICON

BIOGEOCHEMISTRY IN THE GLOBAL PARALLEL OCEAN PROGRAM; CONNECTIONS WITH CLIMATE-RELEVANT TRACE GASES

No abstract prepared.

2003-01-01

485

Aspects of in vitro fatigue in human cortical bone: Time and cycle dependent crack growth

No abstract prepared.

2000-09-19

486

Application of model-based method to measurement of radwaste from nuclear fuel processing

No abstract prepared.

2005-01-01

487

Antioxidant Characteristics and Preparation of Chocolate Added with Sochungryong-Tang (Oriental Medicinal Plants Extract)

No abstract prepared

1998-01-01

488

Akt interacts directly with Smad3 to regulate the sensitivity to TGF-beta-induced apoptosis

Full Text Available

2005-10-01

489

Admissible representations and characters of the affine superalgebras osp(1,2) and sl(2/1)

No abstract prepared.

2004-04-12

490

Adaptation to climate change in coastal zones: An analysis of the interventions to safeguard Venice and its lagoon

No abstract prepared.

1998-07-01

491

Absence of magnetic ordering in a heavy fermion superconductor UBe{sub 13}

No abstract prepared.

2009-02-01

492

A scissors-like state on top of the quadrupole vibrational state in {sup 88}Sr

No abstract prepared

1999-02-01

493

A scissors-like excitation on top of the quadrupole vibrational state in {sup 88}Sr

No abstract prepared.

2001-04-01

494

A numerical analysis of reaction-diffusion effects on species mixing rates in turbulent premixed methane-air combustion

No abstract prepared.

2001-07-01

495

A Green's Function Method for Treating Compton Frequency Redistribution

No abstract prepared.

2009-05-01

496

3D Multispecies Nonlinear Perturbative Particle Simulations of Collective Instabilities in Intense Particle Beams

No abstract prepared.

2004-09-10

497

2004 Rock Deformation Gordon Conference - August 8-12, 2004

No abstract prepared.

2000-01-21

498

'Seaflow Energy from the sea; 'Seaflow' Energie aus dem Meer

No abstract prepared.

2004-08-08

499

'Blue sky upon the Lausitz'; 'Blauer Himmel ueber der Lausitz'

No abstract prepared.

2004-03-01

500