Silylation of Ti‐MCM‐41 by trimethylsilyl‐imidazole and its effect on the olefin epoxidation with aqueous H2O2
Tóm tắt
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 I1260/I1083,I845/I1083 and I760/I1083 of SiMe3 spectra bands detected by FT‐IR or the intensity ratio SiMe3/SiO2 of the 29Si‐MAS‐NMR signals. High level of silylation degree significantly enhances both the catalytic activity and the selectivity to epoxide.
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