添加TMAOH合成A型分子筛膜及其渗透汽化性能  

Synthesis and Pervaporation Properties of A-type Zeolite Membrane Prepared by Adding TMAOH

作　　者：黄爱生[1] 杨维慎[2] 

机构地区：[1]同济大学化学系,上海200092 [2]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023

出　　处：《同济大学学报（自然科学版）》2008年第8期1111-1114,共4页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金资助项目(20607015);同济大学优秀人才培养行动计划资助项目(2006KJ057)

摘　　要：采用在澄清合成液中添加少量四甲基氢氧化铵(TMAOH)的方法在管状氧化铝表面合成了A型分子筛膜;采用X射线衍射谱图(XRD)和扫描电子显微镜(SEM)表征了A型分子筛膜的特征;考察了A型分子筛膜在乙二醇/水体系中的渗透汽化性能.XRD结果表明,氧化铝表面只有A型分子筛存在;SEM结果表明,基膜表面覆盖了一层均匀、致密的分子筛膜.在澄清合成液中添加少量TMAOH,有助于减小分子筛的厚度,从而提高分子筛膜的渗透汽化性能.在温度为343,353,363 K下,当水和乙二醇的质量比为85∶15时,A型分子筛膜都有很高的渗透分离性能,其选择分离系数都大于10 000,渗透量分别为2.88,3.18,5.08 kg.(m2.h)-1.在上述三种温度下,当水的含量减少时,A型分子筛膜的渗透量减小;而在水的含量相同的条件下,随着温度升高,A型分子筛膜的渗透量增加.A-type zeolite membrane was synthesized on the tubular a-Al2O3 supported by adding a small mount of tetramethylammonium hydroxide（TMAOH）in the dear synthesis solution. The as-synthesized A-type mem- brane was characterized by XRD and SEM. The pervaporation properties of the as-synthesized membrane were evaluated by dehydration of glycol/water mixture. The XRD shows only A-type zeolite emerges on the a-Al2O3 support surface. The SEM shows the support surface is fully covered by uniform and dense A-type zeolite membrane. The addition of TMAOH facilitates to decrease the particle size and membrane thickness results in the increasing of the perm-selective properties of the A-type zeolite membrane. At 343,353 and 363 K, when water amount in the feed is m （water）/m （glycol） = 85： 15, the separation factors are greater than 10 000 and the flux is 2.88,3.18 and 5.08 kg· （m^2 · h）^- 1 respectively. At the above temperature, the flux increases with the increment of the water amount in the feed. With the same water amount, the flux increases with the increment of the temperature.

关 键 词：A型分子筛膜 水热合成 渗透汽化 分离 

分 类 号：O647.11[理学—物理化学]