高度取向ZSM-5分子筛膜的制备及其CO2/H2分离性能  

Fabrication of Highly Oriented ZSM-5 Membranes for CO2/H2 Separation

作　　者：刘洋[1] 王林 刘黎 王政[1] 张宇[1] 刘艳[1] 邵秀丽[1] 姜南哲 金政伟 焦洪桥 LIU Yang;WANG Lin;LIU Li;WANG Zheng;ZHANG Yu;LIU Yan;SHAO Xiuli;JIANG Nanzhe;JIN Zhengwei;JIAO Hongqiao(State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering,Institute of Chemistry and Chemical Engineering,National Demonstration Center for Experimental Chemistry Education,Ningxia University,Yinchuan 750021,China;Ningxia Coal Industry Co.Ltd.,China Energy Group,Yinchuan 750411,China;College of Science,Yanbian University,Yanji 133002,China)

机构地区：[1]宁夏大学省部共建煤炭高效利用与绿色化工国家重点实验室化学化工学院化学国家级实验教学示范中心,宁夏银川750021 [2]国家能源集团宁夏煤业有限责任公司,宁夏银川750411 [3]延边大学理学院化学系,吉林延吉133002

出　　处：《石油学报（石油加工）》2020年第2期301-307,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(21766026,21661031);宁夏科技领军人才项目(KJT2016001);宁夏高等学校一流学科建设(化学工程与技术学科)项目(NXYLXK2017A04);国能宁煤有限责任公司和宁夏煤基合成树脂高值化产业技术协同创新项目(2017DC57,2018-243,2018-277)资助。

摘　　要：利用Langmuir-Blodgett(LB)技术,在多孔α-Al2O3底基表面获得排列致密且高度b-轴取向的纯硅Silicalite-1分子筛晶粒层;其次以有序组装的LB晶粒层作为晶种,以可促进Silicalite-1分子筛晶粒沿b-轴方向生长的溴化六丙双铵(dimer-TPABr)为结构导向剂,采用二次生长法,合成了连续致密的ZSM-5分子筛膜。SEM和XRD表征结果表明,在175℃晶化48 h制得的ZSM-5分子筛膜厚度约为2μm,其b-轴晶体优先取向值高达0.862,表明制备的ZSM-5分子筛膜高度b-轴取向。在25℃、渗透压力为0.3 MPa下,该取向ZSM-5分子筛膜的CO2/H2气体的分离因子达到7.37,对应的CO2分子渗透通量为5.96×10^-7 mol/(m^2·s·Pa),说明制备的ZSM-5分子筛膜具有较好的CO2/H2气体分离性能;同时说明利用LB技术可在多孔底基表面制备用于气体分离的取向分子筛膜。Firstly,highly compact and b-oriented Silicalite-1 seeds layer was well organized on the porousα-Al2O3 substrate via the Langmuir-Blodgett(LB)technique.Then,a continuous and defect free ZSM-5 membrane was synthesized using dimer-TPABr as structure direct agent to promote the b-oriented growth rate during the secondary growth procedure.According to the results of scanning electron microscopy(SEM)and X-ray diffraction(XRD),the thickness of prepared ZSM-5 zeolite membranes is about 2μm after crystallization at 175℃for 48 h and the crystallographic preferred orientation(CPO)index is 0.862,which indicate that the prepared ZSM-5 membrane is highly b-oriented.The resulting membrane demonstrates reasonable CO2/H2 gas separation performance with a CO2 permeance of 5.96×10^-7 mol/(m^2·s·Pa)and the CO2/H2 gas separation factor of 7.37 under the osmotic pressure of 0.3 MPa at 25℃.Therefore,this research confirms that the LB technique can be used for preparation of highly oriented zeolite membrane on porous substrate for gas separation.

关 键 词：分子筛膜 Langmuir-Blodgett技术 膜分离 CO2/H2分离 

分 类 号：TQ028.8[化学工程]