硅源预水解对TS-1催化丙烯环氧化的影响

Effect of pre-hydrolysis of silicon source on propylene epoxidation catalyzed by TS-1

钛硅分子筛(TS-1)作为丙烯环氧化反应的主要催化剂,其催化活性与结构中骨架钛的含量密切相关。TS-1的制备包含硅源预水解、硅-钛混合、除醇、晶化等过程,每个过程都对钛原子进入分子筛骨架有一定影响。通过研究不同工艺条件下硅源预水解制备的TS-1发现,在50℃水浴和200 r/min磁子转速条件下,硅源预水解4 h更有利于钛进入分子筛骨架,有效提升TS-1的催化性能。

Titanium silicalite-1(TS-1)is the main catalyst for propylene epoxidation,and its catalytic activity is closely related to the content of framework titanium in the structure.The preparation of TS-1 contains pre-hydrolysis of silicon source,silicon-titanium mixing,alcohol removal,crystallization and other processes.Each process has a certain influence on the entry of titanium atoms into the molecular sieve framework.Titanium silicalite molecular sieves prepared by pre-hydrolysis of silicon source under different process conditions were studied,it was found that pre-hydrolysis of silicon source for 4 h at 50℃water bath and 200 r/min magnet speed was more conducive to the entry of titanium into the molecular sieve framework,thus effectively improving the catalytic performance of TS-1.