水热法合成的钛硅分子筛催化性能研究

考察了用不同模板剂和碱源合成的钛硅 （ＴＳ－１） 分子筛在丙烯环氧化反应中的催化性能， 研究了酸处理和晶粒大小及结晶度的影响。结果表明，ＴＳ－１ 分子筛的催化活性高于ＴＳ－２ 分子筛； 用酸处理催化剂会造成环氧丙烷（ＰＯ） 选择性的下降； ＴＳ－１ 分子筛晶粒增大， 环氧化速率下降， 但环氧丙烷选择性上升； ＴＳ－１ 分子筛结晶度上升， Ｈ２ Ｏ２ 转化率和利用率均提高。以较廉价的四丙基溴化铵 （ＴＰＡＢｒ） 为模板剂， 二乙胺、正丁胺或氨水为碱源， 可合成出具有较好催化丙烯环氧化性能的ＴＳ－１ 分子筛。

CATALYTIC PROPERTIES OF TITANIUM SILICALITS SYNTHESIZED BY HYDROTHERMAL METHOD

Titanium silicalites,synthesized by using different templates and bases,were used to catalyze reactions for synthesis of propylene oxide (PO) from propylene and hydrogen peroxide under identical reaction conditions.Effects of crystal size and crystallinity on the performance of catalyst were investigated.TS 1 zeolite showed higher activity than that of TS 2.PO selectivity decreased if the catalysts were acid treated.As the crystal size of TS 1 zeolite increased,the reaction rate reduced and PO selectivity increased.Both the conversion of H 2O 2 and the utilization of H 2O 2 increased with the increase of TS 1 crystallinity.TS 1 zeolite with good performance in propylene epoxidation can be synthesized by using TPABr as the template,and diethylamine, n butylamine,ammonia etc.as base resoures.