逐级放大制备的TS-1分子筛表征与丙烯直接氧化催化性能对比

采用以络合剂提高钛源稳定性合成钛硅分子筛的方法,在0.2 L,2 L,100 L,2 m3四种不同规模的晶化釜中制备TS-1分子筛,采用XRD,IR,SEM和微结构分析等手段对合成的TS-1分子筛进行表征,考察TS-1分子筛在间歇反应釜中对丙烯直接环氧化的催化效果。结果表明,在四种不同规模晶化釜中合成的TS-1分子筛具有相同的骨架结构,晶形均一,在相同的反应条件下,双氧水转化率与环氧丙烷选择性均在90%以上,逐级放大制备的TS-1分子筛的催化性能基本相当。说明该法制备TS-1分子筛重复性好,易于放大。

CHARACTERIZATION OF TS-1 MOLECULAR SIEVE BY VARIOUS PREPARATION SCALES AND THEIR CATALYTIC PERFORMANCE FOR PROPYLENE EPOXIDATION

Samples of titanium-silicalite molecular sieve were prepared in various size autoclaves (0.2 L, 2 L, 100 L and 2 m3) by using complex agent to improve the stability of titanium source. These samples were characterized by XRD, FT-IR, SEM and micro-structure analysis techniques, and their catalytic performances for propylene epoxidation were also studied. Results showed that the samples of TS-1 molecular sieve prepared by various scales exhibited the same framework structure and having uniform crystals. Using catalysts prepared by these TS-1 samples under the same reaction conditions, the conversion of hydrogen peroxide and the selectivity of propylene oxide were all more than 90%, which indicated that the enlargement of TS-1 molecular sieve preparation was successful and easy to be reproduced.