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HERO ID
4887152
Reference Type
Journal Article
Title
XPS study of MoO2, WO2 and WO3 and their catalytic activities in the izomerization reactions of alkanes
Author(s)
Katrib, A; Logie, V; Peter, M; Wehrer, P; Hilaire, L; Maire, G
Year
1997
Is Peer Reviewed?
0
Journal
Journal de Chimie Physique et de Physico-Chimie Biologique
ISSN:
0021-7689
Publisher
Societe Francaise de Chimie
Volume
94
Issue
11-12
Page Numbers
1923-1937
Language
English
DOI
10.1051/jcp/1997941923
Web of Science Id
WOS:000072148600010
Abstract
The X.P.S Spectra of MoO2, WO2 and WO3 are presented. It was revealed that these commercial MoO2 and WO2 samples are partially oxidized on the surface to the more stable MoO3 and WO3 states respectively, with the presence of Mo(V) and W(V) in the interfaces. In Situ reduction of these samples, by hydrogen at different temperatures enabled to reduce MoO3 or WO3 to lower oxidation states. Catalytic activities in terms of isomerization reactions of 2-methyl pentane reactant to 3-methyl pentane and n-hexane as major products were interpreted in terms of a bifunctional mechanism involving the two free valence electrons of MoO2 and WO2 (metallic site) and the -OH (Bronsted acidic site) on the sample surface.
Keywords
XPS; catalytic reactions; WO2; WO3; MoO2
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