二次水热合成法制备ZSM-5分子筛膜及其渗透汽化性能  

Secondary hydrothermal synthesis of ZSM-5 zeolite membrane and its pervaporation performance

作　　者：朱美华[1] 夏水莲 刘永生[1] 袁晓蕾[1] 李羚[1] 桂田[1] 张飞[1] 刘鑫[1] 陈祥树[1] 

机构地区：[1]江西师范大学化学化工学院,江西南昌330022

出　　处：《化工进展》2016年第9期2885-2891,共7页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金面上项目(21476099);国家自然科学基金青年基金(21503100);国家国际科技合作专项(2015DFA50190);江西省教育厅科学技术研究项目(14240);江西省科技厅对外合作科技项目(20141BDH80011)

摘　　要：采用二次水热合成法在管状多孔莫来石支撑体上制备高耐酸性ZSM-5分子筛膜,系统地研究分子筛晶种和合成溶胶中H_2O/SiO_2摩尔比率对ZSM-5分子筛膜生长与渗透汽化性能的影响,采用X射线衍射、冷场扫描电子显微镜和电子能谱等表征技术分别对制备的ZSM-5分子筛及其ZSM-5分子筛膜的结构、形貌和Si/Al比进行表征。针对分离75℃、90%HAc/H_2O的水溶液,最优化条件下制备的ZSM-5分子筛膜表现出优良的渗透汽化性能,渗透通量和分离因子分别为0.98kg/(m2·h)和890。此外,本研究所采用制备耐酸性ZSM-5分子筛膜的方法表现出良好的重现性,重复制备的12根ZSM-5分子筛膜在75℃下分离90%HAc/H_2O的水溶液时,平均通量和分离系数分别为(0.85±0.15)kg/(m2·h)和650±290。再者,ZSM-5分子筛膜在45~75℃的温度范围内分离50%~95%HAc/H_2O水溶液时都表现出优良的渗透汽化性能。The high acid-proof ZSM-5 zeolite membranes are prepared on tubular porous mullite supports by secondary hydrothermal synthesis,and the effects of seed crystals,H_2O/SiO_2 molar ratio of the precursor synthesis gel on the growth and pervaporation performance of ZSM-5 zeolite membranes are studied systematically. The structure,morphology,and Si/Al ratio of the ZSM-5 zeolite crystals and membranes are characterized by XRD,FE-SEM,and EDX. For the separation of 90% HAc/H_2O mixture at 75℃,the flux and separation factor（H_2O over HAc） of ZSM-5 zeolite membrane prepared with the optimum synthesis condition has a well dehydration performance,and the total flux and separation factor are 0.98kg/（m^2·h） and 890,respectively. Besides,the prepared ZSM-5 zeolite membranes show good reproducibility,and the average flux and separation factor of the 12 pieces of ZSM-5 zeolite membranes are（0.85±0.15）kg/（m^2·h）and 650±290 for dehydration of 90% HAc/H_2O mixture at 75℃. Moreover,the ZSM-5 zeolite membrane presents excellent dehydration performance for 50%~95% HAc/H_2O at 45~75℃.

关 键 词：耐酸性ZSM-5分子筛膜 晶种 H2O/Si O2比率 渗透汽化 重复性 

分 类 号：TQ028.8[化学工程]