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32 results on '"Mironenko, Roman M."'

3. Selective Hydrogenation of Unsaturated Vinyl Ethers in Two‐Chamber Gauge‐Reactor.

Author

Gyrdymova, Yulia V., Saybulina, Elina R., Mironenko, Roman M., and Rodygin, Konstantin S.

Subjects
HYDROGENATION, HYDROGENATION kinetics, WORKING gases, PRESSURE control, PRESSURE gages, VINYL ethers
Abstract

A pressure gauge was incorporated into a two‐chamber glass H‐tube to continuously monitor the pressure inside a reactor when working with gases. The ex situ generated H2, D2, acetylene and CO2 were tested in pressure gauge reactors, and calibration curves were plotted. A series of unsaturated compounds with two or more double C=C bonds accessible for hydrogenation were synthesized for hydrogenation. The hydrogenation proceeded well due to constant pressure control, and the desired products were isolated in good yields. The same hydrogenation procedures were then carried out using steel autoclaves to verify the results and compare them. Surprisingly, almost the same results were obtained, confirming the effectiveness of self‐made glass reactors. The hydrogenation mechanism was further investigated using D‐labeled reagents. The kinetics of hydrogenation was studied both in manometric glass reactors and in steel autoclaves, which showed a similar nature of the main process in both reaction units. Thus, the created reactors can be effectively used in barometric transformations instead of steel autoclaves in appropriate cases. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Effect of the Surface Functionality of Nanoglobular Carbon Altered by its Thermal Treatment on the Formation and Performance of the Pd/Ngc Hydrogenation Catalyst

Author

Mironenko, Roman M., primary, Belskaya, O.B., additional, Raiskaya, Еvgenia Alexandrovna, additional, Arbuzov, A. B., additional, Kokhanovskaya, O. A., additional, Knyazheva, Olga A., additional, Yurpalov, Viacheslav L., additional, Gulyaeva, T.I., additional, Trenikhin, M.V., additional, and Likholobov, V.A., additional

Published
2024
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26. Effect of the Conditions for the Aqueous-Phase Hydrogenation of Furfural over Pd/C Catalysts on the Reaction Routes.

Author

Mironenko, Roman M. and Belskaya, Olga B.

Subjects
*FURFURAL, *PALLADIUM catalysts, *FORMIC acid, *CATALYST supports, *BASE catalysts, *CATALYTIC activity, *CATALYSTS
Abstract

It was shown that the conditions for the hydrogenation of furfural in the presence of palladium catalysts based on carbon supports of different nature (carbon nanotubes, CNTs, carbon nanoglobules, CNGs) affect the rate of catalytic conversions and the yield of main products. An increase in temperature from 323 to 473 K leads to an increase in the specific catalytic activity of Pd catalysts by a factor of 5–7. Under mild reaction conditions (323 and 373 K), the main product is furfuryl alcohol. Under more severe reaction conditions (423 and 473 K), the main routes of catalytic transformations are associated with the participation of water. A catalyst supported on CNTs is more selective in the formation of cyclopentanone, whereas the selectivity to 4-oxopentanal and 5-hydroxy-2-pentanone is higher for a catalyst supported on CNGs. It was found that an increase in pressure from 1 to 5 MPa leads to an increase in the specific catalytic activity of Pd catalysts by almost 10 times. In the presence of a catalyst based on CNTs, an increase in pressure leads to a decrease in the yield of 4-oxopentanal and to an increase in the yield of cyclopentanone. In the presence of a catalyst based on CNGs, the main direction of transformations at any pressure is the hydrolytic opening of the furan ring to form 4-oxopentanal and 5-hydroxy-2-pentanone. [ABSTRACT FROM AUTHOR]

Published
2019
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30. Rapid “Mix‐and‐Stir” Preparation of Well‐Defined Palladium on Carbon Catalysts for Efficient Practical Use.

Author

Yakukhnov, Sergey A., Pentsak, Evgeniy O., Galkin, Konstantin I., Mironenko, Roman M., Drozdov, Vladimir A., Likholobov, Vladimir A., and Ananikov, Valentine P.

Subjects
PALLADIUM catalysts, CATALYST synthesis, HYDROGENATION, GAS chromatography/Mass spectrometry (GC-MS), NUCLEAR magnetic resonance spectroscopy
Abstract

Abstract: A facile direct deposition approach for the preparation of recyclable Pd/C catalysts simply by stirring a solution of tris(dibenzylideneacetone)dipalladium(0) with a suitable carbon material was evaluated. An extraordinarily rapid catalyst preparation procedure (<5 min) under mild conditions and its excellent performance in cross‐coupling and hydrogenation reactions were demonstrated. The key point for catalyst design is the direct deposition of Pd0 centers onto the highly accessible surface area and the avoidance of ill‐defined PdII/Pd0 states. [ABSTRACT FROM AUTHOR]

Published
2018
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32. Effect of γ-Al2O3 hydrothermal treatment on the formation and properties of platinum sites in Pt/γ-Al2O3 catalysts.

Author

Mironenko, Roman M., Belskaya, Olga B., Talsi, Valentin P., Gulyaeva, Tatyana I., Kazakov, Maxim O., Nizovskii, Alexander I., Kalinkin, Alexander V., Bukhtiyarov, Valerii I., Lavrenov, Alexander V., and Likholobov, Vladimir A.

Subjects
*ALUMINUM oxide, *PLATINUM catalysts, *LEWIS acids, *CATALYST supports, *DISPERSION (Chemistry), *METAL complexes
Abstract

Highlights: [•] Increase the fraction of bridging OH groups and concentration of Lewis acid sites. [•] Preferential formation of outer-sphere complexes. [•] Changes in the dispersion and electronic state of supported Pt. [•] Effect of hydrothermal treatment of the support on catalytic properties of Pt/Al2O3. [ABSTRACT FROM AUTHOR]

Published
2014
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