Silylation of Ti-MCM-41 by trimethylsilyl-imidazole and its effect on the olefin epoxidation with aqueous H2O2

被引：50

作者：

Bu, J

Rhee, HK ^{[1
]}

机构：

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

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

来源：

CATALYSIS LETTERS | 2000年 / 66卷 / 04期

关键词：

silylation; trimethylsilyl-imidazole; hydrophobicity; Ti-MCM-41; cyclohexene epoxidation;

D O I：

10.1023/A:1019072228411

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：

Ti-MCM-41 catalyst was silylated with a new silylating agent, N-trimethylsilyl-imidazole (TMSI). TMSI was found to be more effective to improve the hydrophobicity and the catalytic performance of Ti-MCM-41 than other silylating agents. Different levels of silylation were obtained by varying the silylation time. A linear relationship was observed between the degree of silylation and each of the intensity ratios I-1260/I-1083, I-845/I-1083 and I-760/I-1083 of SiMe3 spectra bands detected by FT-IR or the intensity ratio SiMe3/SiO2 of the Si-29-MAS-NMR signals. High level of silylation degree significantly enhances both the catalytic activity and the selectivity to epoxide.

引用

页码：245 / 249

页数：5

共 23 条

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