On the limited selectivity of silica-based epoxidation catalysts

被引：13

作者：

Beck, C ^{[1
]}

Mallat, T ^{[1
]}

Baiker, A ^{[1
]}

机构：

[1] ETH Zentrum, Swiss Fed Inst Technol, Tech Chem Lab, CH-8092 Zurich, Switzerland

来源：

CATALYSIS LETTERS | 2001年 / 75卷 / 3-4期

关键词：

epoxidation; titania-silica; aerogel; cyclohexenol; side reactions; impurities;

D O I：

10.1023/A:1016700323552

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：

Epoxidation of 2-cyclohexen-1-ol with TBHP and TiO2-SiO2, Fe2O3-SiO2 and SiO2 aerogels has been studied. The influence of surface silanol groups and transition metal impurities in titania-silica on the product distribution has been analyzed. The results, supported by literature data, indicate that high surface area silica cannot generally be regarded as an inert matrix in epoxidation catalysts, Contribution of Ti-free silica limits the selectivity of Ti- and Si-containing catalysts in demanding epoxidation reactions. The activity of silica - together with the background oxidation of the olefin - may lead to overestimated intrinsic activities when the reaction rate is related to the Ti content of the catalyst.

引用

页码：131 / 136

页数：6

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