Epoxidation of n-hexene and cyclohexene over titanium-containing catalysts

被引：0
作者：
Jie Bu
Sam-Hun Yun
Hyun-Ku Rhee
机构：
[1] Seoul National University,School of Chemical Engineering and Institute of Chemical Processes
[2] Kwanak-Ku,undefined
来源：
Korean Journal of Chemical Engineering | 2000年 / 17卷
关键词：
TS-1; Ti-beta; Ti-MCM-41; Epoxidation; Silylation; Brønsted Acid; Hydrophobic;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
TS-1, Ti-beta and Ti-MCM-41 molecular sieves have been prepared by direct hydrothermal synthesis method and applied to the epoxidation of n-hexene and cyclohexene with H2O2 under mild conditions. Ti-beta with extremely low Al content was synthesized by using a seed method to suppress the formation of diol produced by Brønsted acid sites present in Ti-beta. It was also found that a large amount of by-products (1-ol and 1-one) formed over hydrophilic Ti-MCM-41. We further modified Ti-MCM-41 by silylation with bis(trimethylsilyl) trifluoroacetamide (BSTFA). Among these catalysts, the Ti-beta with low content of Al enhanced the yield of epoxide and suppressed the formation of diol markedly. The silylated Ti-MCM-41 reduced the formation of by-products and promoted the yields of epoxide significantly. Based on experimental results, a reaction mechanism with two parallel and competitive reactions was proposed.
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页码：76 / 80
页数：4
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