MFI型分子筛膜的制备及气体渗透性能研究  

Study on preparation and gas permeation property of MFI type zeolite membrane

作　　者：袁文辉[1] 胡小芳[1] 罗仡科[1] 郎雪梅[1] 

机构地区：[1]华南理工大学化学工程研究所,广州510640

出　　处：《膜科学与技术》2006年第3期51-55,共5页Membrane Science and Technology

基　　金：教育部留学基金;广东省自然科学基金(04020126)

摘　　要：采用原位水热合成和无模板剂二次生长合成的方法在α-Al2O3基膜上合成了MFI型分子筛膜,并用XRD,SEM和气体渗透实验等方法进行表征,结果表明合成在α-Al2O3基膜的物质为MFI型分子筛.对于水热合成的分子筛膜,氢/异丁烷的理想分离系数在298 K和473 K时分别为97和52;对于二次生长合成的分子筛膜,氢/异丁烷的理想分离系数在298 K和473 K时分别为497和370,远大于它们Knudsen扩散5.34的比值.表明气体是通过MFI型分子筛的孔道透过.水热合成分子筛膜的正/异丁烷理想分离系数在298 K和473 K时分别为22和13;二次生长分子筛膜的正/异丁烷理想分离系数在298 K和473 K时分别为77和70,气体分离数据表明,两种分子筛膜对气体分离是由分子筛分占主导,同时分子筛膜没有裂缺.MFI type zeolite membranes were prepared on α-Al2O3 substrate by in situ hydrothermal synthesis and secondary growth synthesis without template. XRD, SEM and gas permeation experiments were used to characterize the zeolite membrane obtained in this work. Ideal separation factors of Hydrogen/i -butane for MFI type zeolite membrane by in situ hydrothermal synthesis reach 97 and 52 at 298 K and 473 K, and those for MFI type zeolite membrane by secondary growth synthesis up to 497 and 370, respectively. Both separation factors are much higher than that of Knudsen diffusion coefficient, which manifests that the gas molecule passes through the pore in zeolite membrane. Ideal separation factors of n - butane/i- butane for MFI type zeolite membrane by in situ hydrothermal synthesis are up to 22 and 13, and those for MFI type zeolite membrane by secondary growth synthesis up to 77 and 70 respectively. It is shown that the gas separation is dominated by molecular sieving mechanism for both zeolite membranes that are free of defect.

关 键 词：分子筛膜 二次生长法 分离因子 

分 类 号：TQ028.8[化学工程]