Synthesis of SAPO-35 molecular sieve and its catalytic properties in the methanol-to-olefins reaction

SAPO-35 molecular sieve samples with different Si contents were hydrothermally synthesized using hexamethyleneimine as the template and characterized by XRD, XRF, SEM, MAS NMR, XPS and N2 physisorption. Three SAPO-35 samples were tested as methanol-to-olefins catalysts. After the reaction, the evolution of coke species was investigated over SAPO-35 and SAPO-34 catalysts with similar Si concentrations. A correlation between the cage size of the molecular sieves and the coke species was obtained.

摘要以六亚甲基亚胺为模板剂, 14;采用水热法合成了不同硅含量的磷酸硅铝分子筛SAPO-35, 14;并利用X射线衍射、X射线荧光光谱、扫描电镜、固体核磁、X射线光电子能谱和N2吸附-脱附等方法对样品进行了表征. 研究了不同硅含量的SAPO-35分子筛在甲醇转化制烯烃反应中的催化行为, 14;同时对比分析了具有相近硅含量的SAPO-35和SAPO-34分子筛在甲醇转化反应过程中积炭物种随反应时间的演变特征, 14;尝试将分子筛结构和其积炭失活行为进行了关联.

SAPO-35 was hydrothermally synthesized using hexamethyleneimine as the template. The coke species in the MTO reaction over both SAPO-35 and SAPO-34 were investigated and correlated with their cage size.Figure optionsDownload as PowerPoint slide