Influence of the coordination on the catalytic properties of supported W catalysts

被引：125

作者：

Figueras, F ^{[1
]}

Palomeque, J ^{[1
]}

Loridant, S ^{[1
]}

Fèche, C ^{[1
]}

Essayem, N ^{[1
]}

Gelbard, G ^{[1
]}

机构：

[1] Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France

来源：

JOURNAL OF CATALYSIS | 2004年 / 226卷 / 01期

关键词：

peroxotungsten; anionic exchange; zirconia; coordination of W; acidity; oxidation of dibenzothiophene; sulfone;

D O I：

10.1016/j.jcat.2004.05.006

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

Zirconia supported W catalysts were prepared using anionic exchange from a peroxo-tungstate solution and zirconium hydroxides of high surface areas. These solids contain about 20 wt% W and retain a surface area of about 120 m(2)/g after calcinations in air at 873 K, temperature at which their acidity is maximum. Raman spectroscopy shows the presence of tetrahedral W at low temperature, sintered to polytungstates by calcination at 873 K and WO3 at 973 K. These catalysts are active for the oxidation of dibenzothiophene by hydrogen peroxide. The solids containing tetrahedral W cations show higher activity than clusters of WO3. The reaction can be performed with good oxygen selectivity with H2O2 in 2-butanol as solvent, or in decane with tert-butylhydroperoxide as oxidizing agent. The catalysts can be recycled without loss of performances. (C) 2004 Elsevier Inc. All rights reserved.

引用

页码：25 / 31

页数：7

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