用不同方法合成的钛硅分子筛TS-1的拉曼光谱研究

采用不同方法合成了钛硅分子筛ＴＳ－１，Ｒａｍａｎ光谱表征表明，不同方法合成的ＴＳ－１分子筛中钛的分散状态不同，当钛的含量低于１．５％，不同方法合成的ＴＳ－１中的钛主要以高分散状态存在，当钛含量达到２．０％以上时，不同方法合成的钛硅分子筛中钛的分散状态显著不同，其中以ＴｉＣｌ３合成的分子筛中骨架钛的含最高，而杂晶相锐钛矿含量最低，同时催化氯丙烯环氧化活性也最高，而以正钛酸四丁酯为钛源，在静止态下晶化的钛硅分子筛中锐钛矿含量最高，催化活性最低。

A Raman Spectroscopic Study of Titanium Silicalite-1 Prepared by Different Methods

Titanium silicalite 1 (TS 1) zeolite is synthesized by different methods. Raman spectroscopic characterization shows that titania species in TS 1 prepared by different methods are different. When the titania content in the zeolites is less than 1 5%, titania species is present only as highly dispersed framework titania TiO x in all zeolite samples. Further increasing the titania content in the zeolites to or over 2 0%, both highly dispersed framework titania TiO x and extra framework titania exist in the zeolites prepared with tetrabutyl titanate as titanium source. Only trace amount of anatase is found in the zeolites prepared with TiCl 3 as starting material when the titania content is about 2 20%. Catalytic epoxidation of allyl chloride reveals that titanium silicalites prepared from TiCl 3 have the highest activity.