Search Results - "Kazansky, V B"

Intensities of IR Stretching Bands as a Criterion of Polarization and Initial Chemical Activation of Adsorbed Molecules in Acid Catalysis. Ethane Adsorption and Dehydrogenation by Zinc Ions in ZnZSM-5 Zeolite by Kazansky, V. B, Pidko, E. A

“…A DRIFT study of ethane adsorbed by zinc cations in ZnZSM-5 prepared by chemical reaction of the hydrogen form of the zeolite with zinc vapor at 770 K, or by…”
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On two alternative mechanisms of ethane activation over ZSM-5 zeolite modified by Zn2+ and Ga1+ cations by Kazansky, V B, Subbotina, I R, Rane, N, van Santen, R A, Hensen, E J M

“…The activation of ethane over zinc- and gallium-modified HZSM-5 dehydrogenation catalysts was studied by diffuse reflectance infrared spectroscopy. Hydrocarbon…”
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Characterization and reactivity of Ga + and GaO + cations in zeolite ZSM-5 by Rane, N., Overweg, A.R., Kazansky, V.B., van Santen, R.A., Hensen, E.J.M.

“…The reduction of Ga(CH 3) 3/ZSM-5 was closely followed by Fourier transform infrared spectroscopy and Ga K-edge X-ray absorption near-edge spectroscopy…”
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DRIFTS study of the nature and chemical reactivity of gallium ions in Ga/ZSM-5. II. Oxidation of reduced Ga species in ZSM-5 by nitrous oxide or water by KAZANSKY, V. B, SUBBOTINA, I. R, VAN SANTEN, R. A, HENSEN, E. J. M

“…The oxidation of reduced Ga species in ZSM-5 zeolite modified via anchoring of trimethyl gallium or by incipient wetness impregnation with a solution of…”
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Unusual Infrared Spectrum of Ethane Adsorbed by Gallium Oxide by Kazansky, V. B, Subbotina, I. R, Pronin, A. A, Schlögl, R, Jentoft, F. C

“…The present study reports an unusual diffuse reflection Fourier transform (DRIFT) spectrum of ethane adsorbed by gallium oxide. One of the stretching C−H bands…”
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Intensities of combination IR bands as an indication of the concerted mechanism of proton transfer from acidic hydroxyl groups in zeolites to the ethylene hydrogen-bonded by protons by Kazansky, V.B., Subbotina, I.R., Jentoft, F.

“…Adsorption of ethylene by sodium forms of mordenite and Y zeolite is reversible and results in no chemical activation of olefin. Therefore, diffuse reflectance…”
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Integral Absorption Coefficients of C−H Stretching Bands in IR Spectra of Ethane Adsorbed by Cationic Forms of Y Zeolite by Subbotina, I. R, Kazansky, V. B, Kröhnert, J, Jentoft, F. C

“…An attempt to measure absolute intensities of IR C−H stretching bands of ethane specifically adsorbed by Na+, Ca2+, or Mg2+ cations in Y zeolite was carried…”
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DRIFTS study of the chemical state of modifying gallium ions in reduced Ga/ZSM-5 prepared by impregnation. I. Observation of gallium hydrides and application of CO adsorption as a molecular probe for reduced gallium ions by KAZANSKY, V. B, SUBBOTINA, I. R, VAN SANTEN, R. A, HENSEN, E. J. M

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The sites of molecular and dissociative hydrogen adsorption in high-silica zeolites modified with zinc ions. III DRIFT study of H2 adsorption by the zeolites with different zinc content and Si/Al ratios in the framework by KAZANSKY, V. B, SERYKH, A. I, ANDERSON, B. G, VAN SANTEN, R. A

“…study of dihydrogen adsorbed at 77 K by the zinc-modified hydrogen forms of mordenite and ZSM-5 zeolites with the different Si/Al ratios in the framework…”
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Intensities of IR stretching bands as a criterion of the strength of Lewis acid sites in ZSM-5 zeolites with bivalent cations by MIKHAILOV, M. N, KAZANSKY, V. B, KUSTOV, L. M

“…The DFT calculations were applied to investigate the impact of the nature of bivalent cations M (M = Mg2+, Ca2+, Sr2+, Zn2+, Mn2+, Co2+, Ni2+) in…”
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Solvation as a main factor that determines the strength of liquid superacids and the selectivity of the acid-catalyzed reactions of olefins by Kazansky, V.B.

“…Analysis of literature and ab initio quantum chemical calculations indicates that the solvation of protons in anhydrous H 2SO 4 or HF is considerably weaker…”
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Localization of bivalent transition metal ions in high-silica zeolites with the very broad range of Si/Al ratios in the framework probed by low-temperature H2 adsorption by KAZANSKY, V. B

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Effect of Mn and Fe on the Reactivity of Sulfated Zirconia toward H2 and n-Butane:  A Diffuse Reflectance IR Spectroscopic Investigation by Klose, B. S, Jentoft, F. C, Schlögl, R, Subbotina, I. R, Kazansky, V. B

“…Sulfated zirconia (SZ) and sulfated zirconia promoted with 2 wt % manganese (MnSZ) or iron (FeSZ), all active in n-butane isomerization, were investigated…”
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DFT cluster modeling of molecular and dissociative hydrogen adsorption on Zn2+ ions with distant placing of aluminum in the framework of high-silica zeolites by SHUBIN, A. A, ZHIDOMIROV, G. M, KAZANSKY, V. B, VAN SANTEN, R. A

“…The problem of various cationic positions in zeolites with high Si/Al ratio in the framework is discussed. The statistical distribution of aluminum in the…”
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Spectral Study of the Inverse Effect of Metal on the Properties of a Carrier by Kustov, L. M., Redina, E. A., Tkachenko, O. P., Kustov, A. L., Kazansky, V. B.

“…The effects of the mutual influence of supported metal nanoparticles and a carrier are considered for different cases where the carrier is a solid acid, a…”
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Nature of the sites of dissociative adsorption of dihydrogen and light paraffins in ZnHZSM-5 zeolite prepared by incipient wetness impregnation by Kazansky, V B, Borovkov, VYu, AI Serikh, RA van Santen, Anderson, B G

“…A DRIFT study of ZnHZSM-5 zeolites with Si/Al ratios of 15 or 41 and a Zn loading of 0.8 wt% revealed a high thermal stability of bridging OH groups that was…”
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Solvation of protons and the strength of superacids by Kazansky, V B

“…Analysis of literature indicates that the strength of superacids is mainly determined by unusual chemical properties of weakly solvated protons while the…”
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On the nature of the sites of dihydrogen molecular and dissociative adsorption in ZnHZSM-5. II. Effects of sulfidation by KAZANSKY, V. B, SERYKH, A. I, VAN SANTEN, R. A, ANDERSON, B. G

“…The nature of zinc ions in ZnHZSM-5 zeolite prepared by incipient wetness impregnation was studied by DRIFT spectroscopy using dihydrogen adsorbed at low…”
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Density Functional and Hartree−Fock Calculations on the Cyclopropane Ring Intermediates Involved in the Zeolite-Catalyzed Skeletal Isomerization of Hydrocarbons and in the Carbon Isotope Scrambling in 2-Propyl Cation by Frash, M. V, Kazansky, V. B, Rigby, A. M, van Santen, R. A

“…Quantum-chemical calculations were carried out on the mechanism of the zeolite-catalyzed hydrocarbon skeletal isomerization via the cyclopropane ring…”
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Possible molecular structure of promoted Lewis acidity sites in ZnZSM-5 by Zhidomirov, G. M., Shubin, A. A., Kazansky, V. B., Van Santen, R. A.

“…It is suggested that the abnormal methane IR frequency shift observed in ZnZSM‐5 zeolites is caused by adsorptive interaction of CH4 with particularly strong…”
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