用于甲醇制丙烯过程的ZSM-5分子筛的合成及其性能评价

研究并合成出不同硅铝比的ZSM-5分子筛，对制备的催化剂进行XRD，SEM，NH3-TPD，N2吸附-脱附表征，得出制备参数对催化剂性能的影响规律，确定了制备高结晶度、适当粒径大小的NaZSM-5分子筛的合成条件：n(TPA+)/n(SiO2) = 0.16～0.18，H2O/SiO2质量比14～16，晶化温度130～150 ℃，硅铝比500。将合成的NaZSM-5分子筛经挤条、酸交换和焙烧后制得的催化剂用于MTP性能评价试验，结果表明，硅铝比为500的催化剂具有良好的催化反应性能，甲醇转化率在99%以上，丙烯选择性可以维持在45%左右。

SYNTHESIS AND EVALUATION OF ZSM-5 ZEOLITE CATALYST FOR MTP

Fine grain NaZSM-5 zeolites with wide range of Si/Al ratio were prepared by using proper amount of template, tetraethyl orthosilicate（TEOS）and water. The effect of preparation parameters on the performance of the catalysts containing ZSM-5 was studied by XRD，SEM，NH3-TPD，BET techniques and MTP test. The optimal conditions for synthesis of ZSM-5 zeolite are: n(TPA+)/n(SiO2) of 0.16-0.18，H2O/SiO2 mass ration of 14-16, Si/Al ratio of 500 and crystallization temperature of 130～150 ℃. The catalysts containing ZSM-5 were obtained by extrusion, acid exchange and calcination, and evaluated for MTP. The results indicate that the catalyst containing ZSM-5 with Si/Al ratio of 500 has a good performance of MTP. The methanol conversion is higher than 99%, and the propylene selectivity can be maintained at about 45%.