Redox Mechanism for Selective Oxidation of Ethanol over Monolayer V2O5/TiO2 Catalysts | Sciact - CRIS-system of Boreskov Institute of Catalysis

Redox Mechanism for Selective Oxidation of Ethanol over Monolayer V2O5/TiO2 Catalysts Full article

Journal

Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694

Output data

Year: 2016, Volume: 338, Pages: 82-93 Pages count : 12 DOI: 10.1016/j.jcat.2016.02.022

Tags

Acetaldehyde, Acetic acid, Ethanol oxidation, Heterogeneous catalysis, Vanadia

Authors

Kaichev Vasily V. ^1,2 , Chesalov Yuriy A. ^1,2 , Saraev Andrey A. ^1,2 , Klyushin Alexander Yu. ^3,4 , Knop-Gericke Axel ³ , Andrushkevich Tamara V. ¹ , Bukhtiyarov Valerii I. ^1,2

Affiliations

1	Boreskov Institute of Catalysis, Lavrentieva Ave. 5, 630090 Novosibirsk, Russia
2	Novosibirsk State University, Pirogov Str. 2, 630090 Novosibirsk, Russia
3	Department of Inorganic Chemistry, Fritz Haber Institute of the Max Plank Society, Faradayweg 4-6, D-14195 Berlin, Germany
4	Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Division Energy Material, Albert-Einstein-Str. 15, 12489 Berlin, Germany

Funding (1)

The Ministry of Education and Science of the Russian Federation

The selective oxidation of ethanol to acetaldehyde and acetic acid over a monolayer V2O5/TiO2 catalyst has been studied in situ using Fourier transform infrared spectroscopy and near-ambient-pressure X-ray photoelectron spectroscopy (XPS) at temperatures ranging from 100 to 300 °C. The data were complemented with temperature-programmed reaction spectroscopy and kinetic measurements. It was found that under atmospheric pressure at low temperatures acetaldehyde is the major product formed with the selectivity of almost 100%. At higher temperatures, the reaction shifts toward acetic acid, and at 200 °C, its selectivity reaches 60%. Above 250 °C, unselective oxidation to CO and CO2 becomes the dominant reaction. Infrared spectroscopy indicated that during the reaction at 100 °C, nondissociatively adsorbed molecules of ethanol, ethoxide species, and adsorbed acetaldehyde are on the catalyst surface, while at higher temperatures the surface is mainly covered with acetate species. According to the XPS data, titanium cations remain in the Ti4+ state, whereas V5+ cations undergo reversible reduction under reaction conditions. The presented data agree with the assumption that the selective oxidation of ethanol over vanadium oxide catalysts occurs at the redox Vn+ sites via a redox mechanism involving the surface lattice oxygen species. A reaction scheme for the oxidation of ethanol over monolayer V2O5/TiO2 catalysts is suggested

Kaichev V.V. , Chesalov Y.A. , Saraev A.A. , Klyushin A.Y. , Knop-Gericke A. , Andrushkevich T.V. , Bukhtiyarov V.I.
Redox Mechanism for Selective Oxidation of Ethanol over Monolayer V2O5/TiO2 Catalysts

Journal of Catalysis. 2016. V.338. P.82-93. DOI: 10.1016/j.jcat.2016.02.022 WOS Scopus РИНЦ ANCAN OpenAlex

Full text from publisher

Submitted:	Nov 27, 2015
Accepted:	Feb 18, 2016
Published online:	Mar 16, 2016
Published print:	Jun 1, 2016

Web of science:	WOS:000376695500009
Scopus:	2-s2.0-84960927629
Elibrary:	27097439
Chemical Abstracts:	2016:413261
Chemical Abstracts (print):	164:393707
OpenAlex:	W2301047397

DB	Citing
Web of science	78
Scopus	80
Elibrary	85
OpenAlex	86