XPS study of MoO2, WO2 and WO3 and their catalytic activities in the izomerization reactions of alkanes | Health & Environmental Research Online (HERO)

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Citation
Tags

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?

Journal

Journal de Chimie Physique et de Physico-Chimie Biologique
ISSN: 0021-7689

Publisher

Societe Francaise de Chimie

Volume

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