Silylated Ti-grafted hexagonal mesoporous silica （HMS） catalyst was prepared by the chemical vapor deposition （CVD） using TIC14 as titanium source and hexamethyldisilazane （HMDSZ） as silylating agent. The sample...Silylated Ti-grafted hexagonal mesoporous silica （HMS） catalyst was prepared by the chemical vapor deposition （CVD） using TIC14 as titanium source and hexamethyldisilazane （HMDSZ） as silylating agent. The samples were characterized by XRD, N2- adsorption, PTIR, 29Si NMR, DR UV-vis, and evaluated by epoxidation of styrene, propylene, cyclohexene, and 1-hexene with cumene hydroperoxide （CLIP） as oxidant, respectively. It is revealed that the catalyst possesses typical mesoporous structure, high hydrophobicity and highly dispersed tetracoordinated titanium sites and hence exhibits excellent performance in epoxidation of olefins.展开更多
文摘Silylated Ti-grafted hexagonal mesoporous silica （HMS） catalyst was prepared by the chemical vapor deposition （CVD） using TIC14 as titanium source and hexamethyldisilazane （HMDSZ） as silylating agent. The samples were characterized by XRD, N2- adsorption, PTIR, 29Si NMR, DR UV-vis, and evaluated by epoxidation of styrene, propylene, cyclohexene, and 1-hexene with cumene hydroperoxide （CLIP） as oxidant, respectively. It is revealed that the catalyst possesses typical mesoporous structure, high hydrophobicity and highly dispersed tetracoordinated titanium sites and hence exhibits excellent performance in epoxidation of olefins.
