两步变温法微米晶种诱导合成高性能的T型分子筛膜  

Preparation of High Performance Zeolite T Membranes by a Two-Stage Temperature-Varied Synthesis with Microsized Seeds

作　　者：张小亮[1] 宋鑫[1] 邱灵芳[1] 周荣飞[1] 陈祥树[1] 

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

出　　处：《无机化学学报》2012年第9期1914-1918,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.20906042,20966003,21106059);国家“863”计划(No.2012AA03A609);国家重大国际合作研究(No.2010DFB52950);江西省科技支撑计划(No.2010BGA01200)资助项目

摘　　要：在预涂自制微米晶种的多孔管状莫来石支撑体表面上,采用两步变温法诱导合成T型分子筛膜。在溶胶配比nSiO2∶nAl2O3∶nNa2O∶nK2O∶nH2O=1∶0.05∶0.3∶0.1∶30合成条件下,通过变温晶化过程成功制备出高性能的T型分子筛膜。XRD和SEM结果表明,该法可在支撑体表面上较快地形成一层连续致密的纯相T型分子筛膜层,较大缩短了膜合成时间和提高了膜致密性。在优化条件下所合成的膜具有优异的渗透汽化性能,且膜制备的重复性良好。75℃时,在水/异丙醇(10/90,w/w)混合物体系中膜的渗透通量和分离因子分别高达4.25 kg.m-2.h-1,7600;在水/乙醇(10/90,w/w)混合物体系中膜的渗透通量和分离因子分别为2.87 kg.m-2.h-1,1 900。Zeolite T membranes were prepared by a two-stage temperature-varied hydrothermal technique with microsized seeds on the surface of the porous mullite supports.Under the typical synthesis solution of nSiO2：nAl2O3：nNa2O：nK2O：nH2O =1：0.05：0.3：0.1：30,the zeolite T membranes with high permeation performance were successfully synthesized by the two-stage temperature-varied crystallization process.The results of XRD and SEM showed that a continuous and dense T-type zeolite layer formed on the surface of the support.The two-stage temperature-varied synthesis method leads to shorten crystallization time and improved membrane density.The as-synthesized zeolite membranes exhibited high pervaporation performance and high-reproducibility of preparation procedure.The permeation flux and separation factor of the membrane were obtained over 4.25 kg.m-2.h-1 and 7 600 for water/i-propanol（10/90,w/w） mixtures at 75 ℃,respectively.Moreover,the permeation flux of the membrane up to 2.87 kg.m-2.h-1 and separation factor over 1900 were achieved for water/ethanol（10/90,w/w） mixtures at the same operation conditions.

关 键 词：T型分子筛膜 两步变温合成法 二次生长法 渗透汽化 

分 类 号：O611.4[理学—无机化学] TQ028.8[理学—化学]