Theoretical and Experimental Studies of the Nature of the Catalytic Activity of VOx/TiO2 Systems Full article
Journal |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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Output data | Year: 2003, Volume: 44, Number: 5, Pages: 710-717 Pages count : 8 DOI: 10.1023/A:1026110610060 | ||||
Tags | Catalytic Activity; Vanadium; Quantum Chemical Calculation; Nitrogen Oxide; Lewis Acid Site | ||||
Authors |
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Affiliations |
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Funding (5)
1 | Russian Foundation for Basic Research | 00-15-97441 |
2 | Civilian Research and Development Foundation | REC-008 |
3 | Russian Foundation for Basic Research | 01-03-32364 |
4 | International Association for the Promotion of Co-operation with Scientists from the New Independent States of the Former Soviet Union | PAI 04522WK |
5 | International Association for the Promotion of Co-operation with Scientists from the New Independent States of the Former Soviet Union | OPEN-97-10059 |
Abstract:
The states of supported vanadium and the nature of activation of ammonia adsorbed on vanadium sites of VОx/TiО2 catalysts are studied by 51V NMR spectroscopy and diffuse-reflectance IR Fourier-transform (DRIFT) spectroscopy using cluster quantum chemical calculations of NН3 adsorption. We employ the VОx/TiО2 catalyst of two types: the monolayer catalyst in which vanadium is located on the surface of well-crystallized anatase and the catalyst in which vanadium embedded in the anatase lattice at a rather great depth. It is shown that ammonia is predominantly adsorbed on Lewis acid sites of the monolayer catalyst, whereas most of NН3 adsorbed on the catalyst containing bulk vanadium is in the form of ammonium ions. Analysis of experimental and calculated data suggests that, in the monolayer catalyst, NН3 molecules in the selective reduction of nitrogen oxides are activated on Lewis acid sites. Ammonia activation involves the dissociation of the N–H bond in a coordinated molecule, which results in the formation of the amide V–NН2 group and a water molecule coordinated by a V5+ ion. It is likely that, in the case of the catalyst containing bulk vanadium, this reaction occurs with the predominant participation of ammonium ions.
Cite:
Borovkov V.Y.
, Mikheeva E.P.
, Zhidomirov G.M.
, Lapina O.B.
Theoretical and Experimental Studies of the Nature of the Catalytic Activity of VOx/TiO2 Systems
Kinetics and Catalysis. 2003. V.44. N5. P.710-717. DOI: 10.1023/A:1026110610060 WOS Scopus РИНЦ
Theoretical and Experimental Studies of the Nature of the Catalytic Activity of VOx/TiO2 Systems
Kinetics and Catalysis. 2003. V.44. N5. P.710-717. DOI: 10.1023/A:1026110610060 WOS Scopus РИНЦ
Original:
Боровков В.Ю.
, Михеева Э.П.
, Жидомиров Г.М.
, Лапина О.Б.
Теоретическое и экспериментальное изучение природы каталитической активности систем VOx/Ti02
Кинетика и катализ. 2003. Т.44. №5. С.774-782. РИНЦ
Теоретическое и экспериментальное изучение природы каталитической активности систем VOx/Ti02
Кинетика и катализ. 2003. Т.44. №5. С.774-782. РИНЦ
Dates:
Submitted: | Nov 22, 2002 |
Published print: | Sep 1, 2003 |
Identifiers:
Web of science | WOS:000186484400015 |
Scopus | 2-s2.0-0242511625 |
Elibrary | 13439028 |
Chemical Abstracts | 2003:808073 |
Chemical Abstracts (print) | 140:46350 |
OpenAlex | W47919930 |