Acid catalysis of silica-included heteropolyacid in polar reaction media

被引：172

作者：

Izumi, Y ^{[1
]}

Hisano, K ^{[1
]}

Hida, T ^{[1
]}

机构：

[1] Nagoya Univ, Dept Mol Design & Engn, Chikusa Ku, Nagoya, Aichi 464, Japan

来源：

APPLIED CATALYSIS A-GENERAL | 1999年 / 181卷 / 02期

关键词：

heteropolyacid; solid acid; esterification; hydration; alkylation;

D O I：

10.1016/S0926-860X(98)00399-8

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：

Freely water-soluble 12-tungstophosphoric acid could be made insoluble through immobilization inside a silica matrix by means of set-gel technique involving hydrolysis of tetraethyl orthosilicate. The silica-included heteropolyacid thus obtained catalyzed the water-participating reactions of esterification and isobutene hydration more efficiently than the resin catalyst of Amberlyst-15 and the zeolite H-ZSM-5. The silica-induded heteropolyacid is a microporous material with a sharp pore-size distribution around 0.55 nm, and it showed shape selective acid catalysis in the alkylation of phenol with formaldehyde giving a higher yield of 4,4'-dihydroxydiphenylmethane isomer. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：277 / 282

页数：6

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