XPS study of MoO2, WO2 and WO3 and their catalytic activities in the izomerization reactions of alkanes

被引：29

作者：

Katrib, A ^{[1
]}

Logie, V ^{[1
]}

Peter, M ^{[1
]}

Wehrer, P ^{[1
]}

Hilaire, L ^{[1
]}

Maire, G ^{[1
]}

机构：

[1] Univ Strasbourg 1, Inst Le Bel, Lab Etud React Catalyt Surfaces & Interfaces, CNRS,URA 1498, F-67070 Strasbourg, France

来源：

JOURNAL DE CHIMIE PHYSIQUE ET DE PHYSICO-CHIMIE BIOLOGIQUE | 1997年 / 94卷 / 11-12期

关键词：

XPS; catalytic reactions; WO2; WO3; MoO2;

D O I：

10.1051/jcp/1997941923

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

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.

引用

页码：1923 / 1937

页数：15

共 11 条

[1]

CALTON R, 1978, J APPL PHYS, V49, P409

[2] Effect of the reaction temperature and hydrocarbon partial pressure on the activity of carbon-modified MoO3 for n-hexane isomerization [J].

Delporte, P ;

PhamHuu, C ;

Ledoux, MJ .

APPLIED CATALYSIS A-GENERAL, 1997, 149 (01) :151-180

[3]

FRENNET A, 1993, 10TH P INT C CAT BUD, P927

[4] Influence of metal-metal bonds on electron spectra of MoO2 and WO2 [J].

Gulino, A ;

Parker, S ;

Jones, FH ;

Egdell, RG .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1996, 92 (12) :2137-2141

[5]

HEMMING F, 1995, THESIS U L PASTEUR S

[6] The multi-surface structure and catalytic properties of partially reduced WO3, WO2 and WC+O-2 or W+O-2 as characterized by XPS [J].

Katrib, A ;

Hemming, F ;

Wehrer, P ;

Hilaire, L ;

Maire, G .

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 1995, 76 :195-200

[7] Molybdenum based catalysts .1. MoO2 as the active species in the reforming of hydrocarbons [J].

Katrib, A ;

Leflaive, P ;

Hilaire, L ;

Maire, G .

CATALYSIS LETTERS, 1996, 38 (1-2) :95-99

[8]

KATRIB A, IN PRESS SURFACE SCI

[9] Catalytic activity of bulk tungsten carbides for alkane reforming .2. Catalytic activity of tungsten carbides modified by oxygen [J].

Keller, V ;

Wehrer, P ;

Garin, F ;

Ducros, R ;

Maire, G .

JOURNAL OF CATALYSIS, 1997, 166 (02) :125-135

[10] PLATINUM-LIKE BEHAVIOR OF TUNGSTEN CARBIDE IN SURFACE CATALYSIS [J].

LEVY, RB ;

BOUDART, M .

SCIENCE, 1973, 181 (4099) :547-549

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