关键词: Ti, 嫁接, KIT-1分子筛, 两亲性

Abstract: The Ti-KIT-1 sieve was obtained by a grafting method using tetrabutyl titanate as Ti source and KIT-1 as support. An amphiphilic Ti-KIT-1 sieve was prepared from Ti-KIT-1 modified with trimethylchlorosilane and characterized by XRD, DRS, FT-IR and nitrogen adsorption-desorption techniques. Experimental results show that the resultant amphiphilic Ti-KIT-1 sieve remains the original mesoporous structure with a smaller specific BET surface area and BJH volume of pores compared to the Ti-KIT-1 sieve. DRS and FT-IR indicate the existence of tetrahedral titanium (Ⅳ), which may act as active sites for epoxidation of olefin. The amphiphilicity of samples are measured through adsorption capacity for the vapour of water or toluene, acetone, n-hexane. The resultant Ti-KIT-1 sieve is amphiphilic due to the partial coverage of the external surface with the hydrophobic alkylsilane groups and the hydrophilicity of the rest of the surface.

Key words: titanium, grafting, KIT-1 molecular sieve, amphiphilicity