变浓度无有机模板剂合成ZSM-5沸石分子筛膜  

Preparation of ZSM-5 Zeolite Membranes by Concentration Variation with Organic-free Templates

作　　者：成岳[1] 杨宇川[1] 李健生[1] 孙秀云[1] 王连军[1] 

机构地区：[1]南京理工大学环境科学与工程系,南京210094

出　　处：《无机化学学报》2005年第6期796-800,F005,共6页Chinese Journal of Inorganic Chemistry

基　　金：教育部博士点基金项目(No.B20020288015)。

摘　　要：报道了无有机模板剂制备出15 nm的ZSM-5分子筛,并以其为晶种浸涂在多孔α-Al2O3陶瓷管外表面,再用先浓后稀的无有机模板剂的晶化液水热合成出ZSM-5分子筛膜的新方法.晶种和晶化液的物质的量组成为12Na2O:100SiO2:2A12O3:(2500～5000)H2O.XRD分析表明α-A12O3陶瓷管表面的膜层是ZSM-5沸石晶相,SEM结果显示合成的沸石膜层晶体相互交连,形成一层连续的多晶层,厚度约5μm.其对H2、N2和CO2的渗透率分别是0.894、0.327和0.314μmol·(m2·s·Pa)-1,H2/CO2和H2/N2的理想分离因子分别为2.84和2.73.A new method of preparing ZSM-5 zeolite membranes on the outer surface of porous alpha-Al2O3 tubular by coating 15 nm ZSM-5 seeds without organic templates and then by varying-density synthesis with organic-free template sol-gel was investigated. A template-free nanosized ZSM-5 seeds and synthesis sol-gel of molar composition is 12Na(2)O:100SiO(2):2Al(2)O(3):(2 500 similar to 5 000)H2O. XRD showed that the film was consisted of well-crystallized ZSM-5 zeolite. SEM investigation indicated that the zeolite films on the supports were defect free and the film thickness was approximately 5 mu m. The permeation flux of H-2, N-2 and CO2 0.894, 0.327 and 0.314 mu mol center dot(m(2)center dot s center dot Pa)(-1), respectively. The ideal selectivity of membrane for H-2/CO2, H-2/N-2 was 2.84,2.73, respectively.

关 键 词：纳米ZSM-5沸石分子筛膜 无有机模板剂 变浓度晶化 渗透率 合成 催化剂 

分 类 号：O643.36[理学—物理化学] TQ426.7[理学—化学]