SAPO-17分子筛的合成及其对甲醇制烯烃反应的催化性能

Synthesis of SAPO-17 Molecular Sieve and Its Catalytic Performance in Methanol-To-Olefins Reaction

以环己胺（CHA）为模板剂,在水热合成条件下系统研究了不同硅源、晶化时间、模板剂添加量、硅铝比等因素对SAPO-17分子筛合成的影响.实验结果表明：硅溶胶为硅源,96 h为最佳晶化时间,0.11（SiO2）∶（Al2O3）∶1（P2O5）∶1（CHA）∶ 50（H2O）为最佳原料配比,此时合成出的SAPO-17分子筛结晶度最高,并且完全没有结晶态杂质.采用XRD、SEM、N2吸附脱附、FT-IR、NH3-TPD等方法研究了SAPO-17分子筛的物化性能,并用甲醇制烯烃（MTO）反应评价其催化活性.结果表明,SAPO-17分子筛表现出了优异的催化性能.甲醇转化率、低碳烯烃（C2=～ C3=）选择性分别达到100％,85.86％.

The SAPO-17 zeolite has been synthesized by means of the hydrothermal synthesis method using cyclohexylamine （CHA） as a template.The influence of the different silica sources,the crystallization time,the content of the templating agent,as well as the ratio of silica to alumina on the synthesis was systematically investigated.The experiment results show that the synthesised SAPO-17 zeolite was highly crystalline and free of crystalline impurity under the following optimal synthesis conditions：silica source was aqueous silica sol,the ratio of gel was 0.11 （SiO2） ∶ 1 （Al2O3） ∶ 1 （P2O5） ∶ 1 （CHA） ∶ 50 （H2O）,and the crystallization time was 96 h.The properties of SAPO-17 were characterized by XRD,SEM,N2 adsorption-desorption,NH3-TPD and FT-IR technique.When methanol was applied to olefin （MTO） reactions,SAPO-17 showed excellent catalytic performance.The methanol conversion and C2=～C3=selectivity were 100％,85.86％,respectively.