Transient isotopic study of methanol oxidation on unsupported V2O5 -: Mechanism of methylal formation

被引：48

作者：

Tatibouët, JM

Lauron-Pernot, H

机构：

[1] Univ Poitiers, Ecole Super Ingenieurs Poitiers, Catalyse Chim Organ Lab, CNRS,UMR 6503, F-86022 Poitiers, France

[2] Univ Paris 06, Lab React Surface, CNRS, UMR 7609, F-75252 Paris 05, France

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2001年 / 171卷 / 1-2期

关键词：

methanol oxidation; V2O5; mechanism; methylal; hemimethylal; transient isotopic experiments; deuterated methanol;

D O I：

10.1016/S1381-1169(01)00104-2

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 mechanism of methylal formation by methanol oxidation on unsupported V2O5 catalyst has been investigated in transient isotopic experiments, performing an exchange between CH3 OH and CD3 OD. Adsorbed methoxy groups and hemimehylal (CH3OCH2OH) have been identified as intermediate species, the hemimethylal being formed by reaction between an activated methanol species (. CH2OH) and the surface methoxy groups. The methylal is then obtained by a dehydration reaction between hemimethylal and a methanol molecule or a surface methoxy group. We can also propose that the methyl formate formation (HCOOCH3) could occur by hemimethylal oxidative dehydrogenation, the hemimethylal (CH3OCH2OH) appearing then as the key intermediate in the methanol oxidation to methylal and methyl formate. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：205 / 216

页数：12

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