合成条件对高硅SSZ-13分子筛膜单气体渗透性能的影响  

The Effects of Synthesis Condition on Single Gas Permeation Performance of High Silica SSZ-13 Zeolite Membrane

作　　者：朱美华[1] 袁晓蕾[1] 梁丽 吴庆喜 张世坤 王贺礼 张飞[1] 陈祥树[1] ZHU Meihua;YUAN Xiaolei;LIANG Li;WU Qingxi;ZHANG Shikun;WANG Heli;ZHANG Fei;CHEN Xiangshu(Jiangxi Inorganic Membane Materials Engineering Research Center,College of Chemical and Chemistry Engineering,Jiangxi Normal University, Nanchang Jiangxi 330022, China)

机构地区：[1]江西省无机膜材料工程技术中心,江西师范大学化学化工学院,江西南昌330022

出　　处：《江西师范大学学报（自然科学版）》2017年第6期562-568,共7页Journal of Jiangxi Normal University(Natural Science Edition)

基　　金：“863”计划(2012AA03A609);国家自然科学基金(20906042,20966003);江西省自然科学基金(2015ACB20018)资助项目

摘　　要：采用2次水热合成法在多孔莫来石支撑体外表面上制备高硅SSZ-13分子筛膜,考察了合成溶胶中的Si/Al比、晶化时间、晶化温度、H_2O/SiO_2比对合成高硅SSZ-13分子筛膜的单气体渗透性能的影响.高硅SSZ-13分子筛膜的CO_2和CH_4的单气体渗透性能依赖于合成溶胶中的Si/Al比,Si/Al比越高,越有利于气体分离.其次,合成溶胶中H_2O/SiO_2比和晶化条件也能够影响分子筛晶体形貌、分子筛层厚度以及分子筛膜的单气体渗透性能.当合成溶胶的摩尔配比为1.000 SiO_2∶0.100 Na2O∶0.100 TMAda OH∶80.000H_2O∶0.005 Al_2O_3,晶化时间和温度分别为48 h和160℃时,制备的高硅SSZ-13分子筛膜具有最佳的单气体渗透性能,对CO_2的渗透速率可达到3.0×10-7mol·m-2·s-1·Pa-1,CO_2/CH_4的理想选择性为39.High silica SSZ-13zeolite membranes are prepared on the outer surface of the porous mullite support by secondary hydrothermal synthesis.Effect of synthesis conditions,such as SiO2/Al2O3and H2O/SiO2ratios of the precursor synthesis gel,crystallization time and temperature,on the single gas permeation performance of high silica SSZ-13zeolite membranes are studied in details in this work.The CO2and CH4single gas permeation performance of high silica SSZ-13zeolite membranes are greatly depended on the Si/Al ratio of the precursor gel,the high silica SSZ-13zeolite membranes shows well gas separation performance for CO2/CH4separation.The initial synthesis gel with the medium H2O/SiO2ratio and crystallization conditions are crucial to zeolite crystals morphology,zeolite layer thickness and single gas permeation performance of high silica SSZ-13zeolite membrane.When the molar composition of the precursor synthesis gel,the crystallization temperature and time are1.000SiO2∶0.100Na2O∶0.100TMAdaOH∶80.000H2O∶0.005Al2O3,160℃and48h,the CO2permeances is3.0×10-7mol·m-2·s-1·Pa-1and CO2/CH4separation factor of the as-synthesized SSZ-13zeolite membrane is39.

关 键 词：高硅SSZ-13分子筛膜 Si/Al比 CO2/CH4气体分离 

分 类 号：O647[理学—物理化学]