CATALYSIS BY HETEROPOLY COMPOUNDS .18. OXIDATION OF METHACRYLALDEHYDE OVER 12-MOLYBDOPHOSPHORIC ACID AND ITS ALKALI SALTS

被引：35

作者：

MIZUNO, N ^{[1
]}

WATANABE, T ^{[1
]}

MISONO, M ^{[1
]}

机构：

[1] UNIV TOKYO, FAC ENGN, DEPT SYNTHET CHEM, BUNKYO KU, TOKYO 113, JAPAN

来源：

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN | 1991年 / 64卷 / 01期

关键词：

D O I：

10.1246/bcsj.64.243

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The reaction scheme for the methacrylaldehyde oxidation over heteropoly compounds proposed previously (M. Misono et al., Proc. 7th Intl. Congr. Catal., 1980) was confirmed by O-18 tracer experiments using the Pulse-MS method (combination of pulse reactor/mass spectrometer). The occurrence of direct and rapid oxygen exchange between methacrylaldehyde and the polyanion of M(x)H(3-x)PMo12O40 (M = Na, Cs, x = 0-3.15) was verified under the reaction conditions. The results also suggested that this reaction is catalyzed by Bronsted acid sites of the catalysts via such intermediates as (I) and/or (II) in scheme 1. It was shown that the methacrylaldehyde oxidation is a surface-tyepe reaction and the catalytic activity is controlled by the oxidizing ability of the catalyst surface.

引用

页码：243 / 247

页数：5

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