两步晶化制备高性能a&b取向T型沸石膜  

High Performance a&b Oriented T Zeolite Membrane by a Two-stage Crystallization Synthesis

作　　者：张博 张宁 杨建华[2] 兰建成 王金渠 ZHANG Bo;ZHANG Ning;YANG Jianhua;LAN Jiancheng;WANG Jinqu(School of Petroleum and Chemical Engineering,Dalian University of Technology,Panjin124221,China;Institute of Adsorption and Inorganic Membrane,State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学石油与化学工程学院,盘锦124221 [2]大连理工大学精细化工国家重点实验室,吸附与无机膜研究所,大连116024

出　　处：《无机材料学报》2020年第8期939-946,共8页Journal of Inorganic Materials

基　　金：国家高新技术研究发展计划(863计划)(2015AA03A602)。

摘　　要：采用廉价的大孔α-Al2O3作为载体,通过二次晶种诱导+两步变温水热合成工艺,成功制备出薄而致密的高性能T型沸石膜。该方法能够充分发挥晶种的诱导成核作用,通过改变两阶段水热晶化温度和时间来控制晶种外延生长和晶体生长方向,最终获得了连续、无缺陷的a&b取向T型沸石膜。实验过程中详细考察了第一阶段的晶化温度、晶化时间以及第二阶段的晶化温度对沸石膜表面结构和性能的影响,并将最优两步晶化条件下制备的膜用于90wt%的异丙醇/水渗透汽化分离,在75℃下膜的通量为3.84 kg·m-2·h–1,分离因子大于10000。A thin and dense high-performance T-type zeolite membrane was successfully prepared by a two-step seed crystal induction plus two-step temperature-varied hydrothermal synthesis on inexpensive and macroporous α-Al2O3 support. This method can fully perform nucleation of seed crystal, regulate the epitaxial growth and crystal growth direction by changing the hydrothermal crystallization temperature and time during the two-stage. Finally a continuous and defect-free a&b oriented zeolite T membrane was obtained. Effects of crystallization temperature and crystallization time of the first-stage and crystallization temperature of the second-stage on the surface structure and properties of zeolite membranes were investigated. The T-type zeolite membrane prepared under the optimal two-step crystallization condition displayed high pervaporation performance with flux over 3.84 kg·m–2·h–1 and separation factor higher than 10000 for separation of 90 wt% isopropanol/water at 75 ℃.

关 键 词：T型沸石膜 两步晶化 a&b取向 渗透汽化 

分 类 号：TQ174[化学工程—陶瓷工业]