【作者】 杨淼； 王婵； 李名润； 徐舒涛； 田鹏； 杨越； 刘中民；

【Author】 Miao Yang;Chan Wang;Mingrun Li;Shutao Xu;Peng Tian;Yue Yang;Zhongmin Liu;National Engineering Laboratory for Methanol to Olefins,Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences;State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences;

【机构】 甲醇制烯烃国家工程实验室大连洁净能源国家实验室大连化物所中国科学院； 催化基础国家重点实验室大连化物所中国科学院；

【摘要】 硅铝分子筛和磷酸硅铝分子筛是重要的固体酸催化剂,其规则的微孔结构为反应带来优异的选择性,同时也限制了反应底物的尺寸。另外,体积偏大的(副)产物将受到扩散限制、易形成积炭而使催化剂失活。合成具有中微孔复合结构的分子筛材料是解决上述问题的有效途径。在前期工作中,我们使用至下而上的软模板法~[1]和至上而下的二次晶化法~[2]分别合成了具有多级孔结构和纳米尺寸的SAPO-34分子筛。本文中,我们进一步将两者有机结合,成功实现了介孔SAPO-34分子筛的快速可控合成。该方法晶化时间短、相区宽,产品的组成与孔性质可调变。值得注意的是,产品同时保持了高结晶度、合适的酸性质与单晶的特征,具有优异的水热稳定性,在甲醇制烯烃反应中显示了优异的催化性能。更多还原

【Abstract】 Zeolites and silicoaluminophosphate(SAPO) molecular sieves are regarded as the most important solid acid catalysts,whose microporous structure bring the excellent selectivity for the catalytic reaction.Nevertheless,their applications are limited to small molecular reactions,and the catalytic lifetime will be shortened if large molecular byproducts are produced and blocked in a narrow structural domain.Integrating mesopores into microporous structures is believed to be an effective solution for this problem.In this work,a new reconstruction method has been developed by combining the top-down and bottom-up methods which can realize the fast and controllable synthesis of hierarchical porous SAPO-34 in a wide phase region.The synthesized mesoporous SAPO-34 s keep the nature of single crystal with tunable porositiy and composition.Moreover,the material has high crystallinity,suitable acidity and excellent hydrothermal stability,which exhibits significantly improved MTO catalytic performance.更多还原