以钛酸丁酯为钛源, 以KIT-1为载体,采用嫁接法制备了含钛介孔分子筛Ti-KIT-1, 将Ti-KIT-1分子筛经三甲基氯硅烷改性得到两亲性含钛介孔分子筛. 利用XRD、DRS、FT-IR和低温N2吸附-脱附等手段对其进行了表征; 并通过测定样品在水或有机物饱和蒸汽中的吸附量, 研究了样品的两亲性. 与改性前样品Ti-KIT-1相比, 制备出的两亲性含钛分子筛保持了原来的介孔结构, 其BET比表面积和BJH孔容均稍有下降. FT-IR和DRS结果说明该分子筛骨架中存在四配位钛, 从而有可能成为催化烯烃环氧化反应的活性中心. 由于外表面部分覆盖有增水性的硅烷基团而其它部分呈现亲水性, 使分子筛表现出很好的两亲性.
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.
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