变温陈化法制备TS-1分子筛及其催化性能

通过变温陈化步骤,采用水热结晶法制备TS-1分子筛。改变陈化步骤,得到一系列粒径不同的TS-1分子筛,并探究粒径对丙烯醇环氧化反应催化性能的影响。采用FT-IR、UV-Vis、BET、XRD和SEM等表征TS-1分子筛催化剂晶相,结果表明,不同条件制得的TS-1分子筛具有相同的MFI结构,Ti大部分以骨架钛形式存在,也有少量锐钛矿相Ti O2存在。随着反应温度的升高,TS-1粒径逐渐增大。通过后续催化反应发现,TS-1分子筛催化剂的催化活性改变不大,这可能是由于催化剂中活性位点的数目变化不大。从催化剂分离实验可以看出,随着粒径的增大,催化剂回收率从82.4%增至95.3%。

Preparation and catalytic performance of TS-1 molecular sieve by aging at changing temperature

TS-1 molecular sieve was prepared by hydrothermal crystallization method through aging at different temperature.A series of TS-1 with different particle size were obtained by changing aging steps,and effects of particle size on the catalytic performance of epoxidation of propylene alcohol were investigated.The crystalline phases of the obtained catalysts were investigated by FT-IR,UV,BET,XRD,and SEM,the results showed that the TS-1 prepared by different conditions had the same MFI structure.Most Ti was in the framework,some few was anatase TiO₂.As reaction temperature increased,the particle size of TS-1 gradually increased.The catalytic activity changed little,probably due to that the number of active sites in the catalyst did not change much.The catalyst separation experiment showed that the catalyst recovery increased from 82.4% to 95.3% with the increasing of particle size.