Partial oxidation of methane to formaldehyde over W/HZSM-5 catalysts

被引：60

作者：

de Lucas, A ^{[1
]}

Valverde, JL ^{[1
]}

Canizares, P ^{[1
]}

Rodriguez, L ^{[1
]}

机构：

[1] Univ Castilla La Mancha, Fac Chem, Dept Chem Engn, Ciudad Real 13004, Spain

来源：

APPLIED CATALYSIS A-GENERAL | 1998年 / 172卷 / 01期

关键词：

oxidation of methane (partial); formaldehyde; W/HZSM-5; catalyst; supported tungsten species;

D O I：

10.1016/S0926-860X(98)00114-8

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 ; 081704 ;

摘要：

The partial oxidation of methane to formaldehyde using molecular oxygen as oxidant was studied over W/HZSM-5 catalysts with tungsten loading varying from 0.3% to 11.9%. The catalysts were characterized by means of XRD, UV diffuse reflectance spectroscopy, BET, TPR and TPD of ammonia. Three different types of supported species were detected: tetrahedral monomeric species, octahedral polymeric species, octahedral polymeric species and WO3 crystallites. The relative amount of each one varies significantly with the tungsten loading. At high contents, a decrease in BET areas due to the partial blocking up of the channels of the zeolite and a lessening of the number of acid sites were observed. It was found that supported tungsten oxide phase possesses active sites to partial oxidation of methane to formaldehyde. HCOH selectivity seems to be dependent on the dispersion and the nature of the tungsten oxide species in the catalyst. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：165 / 176

页数：12

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