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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

用不含有机模板剂的晶化液在多孔α-Al2O3管上合成ZSM-5沸石膜

成岳; 王连军; 李健生; 孙秀云; 刘晓东   

  1. 南京理工大学化工学院, 南京 210094
  • 收稿日期:2004-11-08 修回日期:2004-12-06 出版日期:2005-11-20 网络出版日期:2005-11-20

ZSM-5 Zeolite Membranes Prepared on Porous α-Al2O3 Tube from a Template-free Crystallization Gel

CHENG Yue; WANG Lian-Jun; LI Jian-Sheng; SUN Xiu-Yun; LIU Xiao-Dong   

  1. Chemistry Engineering School of Nanjing University of Science and Technology; Nanjing 210094, China
  • Received:2004-11-08 Revised:2004-12-06 Published:2005-11-20 Online:2005-11-20

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摘要：

采用不含有机模板剂的晶化液在平均孔径为2μm的多孔α-Al2O3管上合成了ZSM-5 沸石膜.纳米ZSM-5沸石晶种的摩尔组成为9TPAOH:25TEOS:0.25 Al2O3:480H2O.多孔α-Al2O3载体管外表面用这些粒度为100nm左右的晶种悬浮液浸涂、干燥后,依据纳米ZSM-5 沸石晶种的DTA/TG进行煅烧,在不含有机模板剂的摩尔组成为67Na2O:Al2O3:240SiO2: 6000H2O晶化液中合成了ZSM-5膜.XRD确定膜晶体为ZSM-5沸石,SEM表明沸石膜无缺陷,膜厚度约为8μm.制备的ZSM-5沸石膜H2的渗透率为1.50×10-6mol·m2·s-1·Pa-1,理想分离因数αH/N2为3.85左右.

关键词: 纳米晶种, 模板剂, ZSM-5沸石膜, 渗透率

Abstract: ZSM-5 zeolite membranes synthesized on rough porous α-Al2O3 tubes with an average pore size of 2μm in the absence of organic template crystallization gel were investigated. The
molar composition of nanosized ZSM-5 seeds was 9TPAOH: 25TEOS: 0.25 Al2O3: 480H2O. Porous α-Al2O3 tubes were seeded with these colloidal TPA-silicalite-1 crystals with
a size of 90～100nm. The seeded supports were calcined in accordance with DTA/TG of nanosized ZSM-5 and treated in a synthesis sol-gel to grow the seed crystals into ZSM-5 membranes on the outer
surface of porous α-Al2O3 tubes. The molar composition of the crystallization gel without organic templates was 67Na2O:Al2O3: 240SiO2: 6000H2O. XRD patterns show that the
film consists of well-crystallized ZSM-5 zeolite. SEM investigation indicates that the zeolite films on the supports are defect free and that the film thickness is approximately 8μm. The permeability
for H2 is 1.50×10-6mol$·m-2·s-1·Pa-1 and the ideal separation factor for H2/N2 is about 3.85.

Key words: nanosized seeds, template, ZSM-5 zeolite membrane, permeance

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