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204 results on '"Bogdan, V. I."'

3. Current trends in organic chemistry: contribution of the N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences

Author

Egorov, M. P., Ananikov, V. P., Baskir, E. G., Boganov, S. E., Bogdan, V. I., Vereshchagin, A. N., Vil’, V. A., Dalinger, I. L., Dilman, A. D., Eliseev, O. L., Zlotin, S. G., Knyazeva, E. A., Kogan, V. M., Kononov, L. O., Krayushkin, M. M., Krylov, V. B., Kustov, L. M., Levin, V. V., Lichitsky, B. V., Medvedev, M. G., Nifantiev, N. E., Rakitin, O. A., Sakharov, A. M., Svitanko, I. V., Smirnov, G. A., Stakheev, A. Yu., Syroeshkin, M. A., Terent’ev, A. O., Tomilov, Yu. V., Tretyakov, E. V., Trushkov, I. V., Fershtat, L. L., Chaliy, V. A., and Shirinian, V. Z.

Published
2024
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34. Tandem Reactions in Acetone–Isopropanol System on MgSnO3 Catalyst under Supercritical Conditions.

Author

Savarets, A. R., Bogdan, T. V., Koklin, A. E., Mashchenko, N. V., and Bogdan, V. I.

Abstract

The results of a study of tandem reactions - aldol-crotonic condensation and hydrogenation by the mechanism of hydride transfer in acetone-isopropanol mixtures on a МgSnО3 catalyst at 300–400°C and 12.0 MРa are presented. In these conditions the mixture of reactants (acetone and isopropanol) and reaction products is in supercritical state. The temperature dependences of the reactants conversion and the selectivity for condensation and hydrogenation products are considered. It has been established that the hydrogenation of acetone aldol-crotonic condensation products proceeds by the addition of hydrogen from isopropanol molecule to C=O-bonds of isomeric mesityl and phorone oxides and is accompanied by dehydration of alcohols and isomerization of double C=C-bonds. The optimal conditions for the formation of the carbonyl group hydrogenation products are 350°C and the ratio acetone : isopropanol = 7 : 3. At the acetone to isopropanol ratio 1 : 1, methylpentadienes dominate in the products of mesityl oxide conversion. The hydrogenation reaction also proceeds with the participation of isophorones, the condensation products of three acetone molecules. [ABSTRACT FROM AUTHOR]

Published
2023
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38. Formation of Ptδ+/Pt0 active sites on Ni-Cr composites supported on carbon carrier in bicyclohexyl dehydrogenation.

Author

Bogdan, T. V., Kalenchuk, A. N., Koklin, A. E., and Bogdan, V. I.

Subjects
CARBON composites, DEHYDROGENATION, NICKEL-chromium alloys, PLATINUM, CATALYST structure, HYDROGEN storage, TRANSMISSION electron microscopy, OXYGEN reduction
Abstract

The activity of Pt/C, Pt/Ni/C, Pt/Cr/C, and Pt-Ni-Cr/C catalysts in the dehydrogenation reaction of bicyclohexyl, a step of hydrogen release in chemical hydrogen storage systems, was studied. The catalyst surface structure was investigated by transmission electron microscopy. The charge state of platinum was assessed by XPS. The role of nickel and chromium promoters in the formation of electron-deficient (Ptδ+) and zero-valent (Pt0) platinum was analyzed. The activity of catalysts in the dehydrogenation reaction of bicyclohexyl was affected by the Ptδ+/Pt0 ratio. The highest conversion and yield of biphenyl, the product of the complete dehydrogenation of bicyclohexyl, were achieved at aPtδ+/Pt0 ratio close to 1–2. [ABSTRACT FROM AUTHOR]

Published
2023
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48. DFT Study of Potential Barriers and Trajectory of CO2 Adsorption/Desorption As Well As Dissociation on Clusters Simulating Fe (100), Fe (110), and Fe (111) Facets.

Author

Tolkachev, N. N., Pokusaeva, Ya. A., and Bogdan, V. I.

Abstract

Density functional theory calculations (DFT) were performed to investigate the Fe-facet effect on the CO2 potential barrier as well as trajectory of CO2 adsorption. It was found that potential barrier of CO2 adsorption on Fe (111) is almost absent (~0.01 eV). At the same time, potential barriers of CO2 adsorption on Fe (100) and Fe (110) are 0.10 and 0.26 eV, correspondingly. The most stable configuration of CO2 adsorption on different Fe facets under consideration is CO2 adsorbed on Fe (111) with heat effect –1.16 eV, whereas adsorption energies of CO2 on Fe (100) and Fe (110) are –0.87 and –0.15 eV, correspondingly. Found values are in good agreement with literature data. Most energetically favorable trajectory of the CO2 adsorption passes through 2-fold adsorption site (located near two neighbor Fe atoms) in case of flat Fe facets (100) and (110). Unexpectable tend to spontaneous dissociation of CO2 molecule on desorption stage was found at distance ~2.66 Å above Fe (100) surface. Analysis of electron spin distributions allows one to conclude that dissociation is caused by excitation of CO2 molecule accompanied with rearrangement of the spin density of the both CO2 molecule and surface Fe (100) atoms rather than charge transfer. CO2 dissociation on adsorption stage on Fe (100) facet was not found as well as it was not observed over other Fe facets both on desorption and on adsorption stages. [ABSTRACT FROM AUTHOR]

Published
2023
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49. Catalytic Hydrogen Storage Systems Based on Hydrogenation and Dehydrogenation Reactions.

Author

Kalenchuk, A. N. and Bogdan, V. I.

Abstract

Systems for the production, storage, and accumulation of hydrogen are an important line in the development of fundamental and applied aspects of alternative energy. Liquid organic hydrogen carriers (LOHCs), polycyclic forms of the corresponding aromatic compounds, are an effective way of hydrogen storage and release with contents of up to 7.3% by mass. The authors compare LOHCs as potential substrates for hydrogen storage and release systems based on catalytic hydrogenation and dehydrogenation reactions, inclusively, with cyclohexane, methylcyclohexane, decalin, perhydroterphenyl, bicyclohexyl, perhydrodibenzyltoluene, and perhydroethylcarbazole. Some data on the activity and selectivity of Pt-containing dehydrogenation catalysts are presented for each of the perhydrogenated substrates. [ABSTRACT FROM AUTHOR]

Published
2023
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