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

被引：17

作者：

Bu, J

Yun, SH

Rhee, HK ^{[1
]}

机构：

[1] Seoul Natl Univ, Sch Chem Engn, Kwanak Ku, Seoul 151742, South Korea

[2] Seoul Natl Univ, Inst Chem Proc, Kwanak Ku, Seoul 151742, South Korea

来源：

KOREAN JOURNAL OF CHEMICAL ENGINEERING | 2000年 / 17卷 / 01期

关键词：

TS-1; Ti-beta; Ti-MCM-41; epoxidation; silylation; Bronsted acid; hydrophobic;

D O I：

10.1007/BF02789257

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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 Bronsted 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) tri-fluoroacetamide (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.

引用

页码：76 / 80

页数：5

共 22 条

[1]

Anderson D., 1974, ANAL SILICONES

[2]

Balkus KJ, 1996, STUD SURF SCI CATAL, V101, P1341

[3] Selective dihydroxylation over titanium silicate molecular sieves [J].