SSZ-13沸石粒径及硅铝比对甲醇制烯烃反应性能的影响  

Effects of crystal size and silica-alumina ratio of SSZ-13 zeolite on the performance of methanol-to-olefins reaction

作　　者：朱小春 李苗苗 代跃利[2] 汲永刚 申宝剑[1] Zhu Xiaochun;Li Miaomiao;Dai Yueli;Ji Yonggang;Shen Baojian(State Key Laboratory of Heavy Oil Processing and CNPC Key Laboratory of Catalysis,China University of Petroleum (Beijing), Beijing 102249,China;Daqing Chemical Research Center,Petrochemical Research Institute,CNPC,Daqing 163714,Heilongjiang,China)

机构地区：[1]中国石油大学(北京),重质油国家重点实验室,中国石油天然气集团(CNPC)催化重点实验室,北京102249 [2]中国石油天然气股份有限公司大庆化工研究中心,黑龙江大庆163714

出　　处：《工业催化》2020年第10期28-33,共6页Industrial Catalysis

基　　金：国家自然科学基金(21706281,U1862106);中国石油大学(北京)科研基金(2462016YJRC014)。

摘　　要：通过调控合成配方,以水热合成法制备一系列不同粒径及硅铝比的SSZ-13沸石,考察沸石孔道结构、酸性质与催化性能之间的关系。采用XRD、SEM、XRF、N2吸附-脱附以及27Al MAS NMR对沸石样品进行详细的表征,并评价其甲醇制烯烃反应(MTO)催化性能。结果表明,小晶粒SSZ-13沸石相对结晶度高、晶粒尺寸均一;在MTO中,小晶粒SSZ-13沸石的MTO催化寿命大幅高于大晶粒SSZ-13沸石;减小晶粒尺寸可改善分子扩散效率,在此基础上提高沸石的酸密度可增加其活性稳定性。A series of SSZ-13 zeolites with different particle sizes,and silica-to-aluminum ratios were prep-ared by hydrothermal synthesis via adjusting the synthesis formula.The relationships between the zeolite pore structure,acidic properties,and catalytic performance were investigated.XRD,SEM,XRF,N2 adsorption-desorption and 27Al MAS NMR were adopted to characterize the zeolite samples in detail and their MTO catalytic performance were evaluated.The results show that the SSZ-13 zeolites with ultra-small crystal size have relatively high crystallinity and uniform grain size.The catalytic lifetime of the small crystal SSZ-13 zeolitesare significantly higher than that of the SSZ-13 zeolites with larger crystal size;the molecular diffusion efficiency can be improvedby reducing the grain size,therefore,the activity stability of the zeolite catalyst could be promoted by increasing the density of the strong acid sites.

关 键 词：催化剂工程 SSZ-13沸石 粒径 晶粒尺寸 硅铝比 甲醇制烯烃 

分 类 号：O643.36[理学—物理化学] TQ426.94[理学—化学]