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Synthesis of stable ZIF-8 membranes on macroporous α-Al2O3 ceramic tubes by using ZnO layer as linker and induction sites

Authors： Li Shaohui, Liu Haiou, Zhang Xiongfu﹡

Units： State Key Laboratory of Fine Chemicals, Dalian University of Technology,

KeyWords：

ClassificationCode：O614

year,volume(issue):pagination： 2014,34(5):65-72

Abstract：

ZIF-8 membranes were synthesized on macroporous α-Al2O3 tubes of average pore size 3μm as supports by introducing a thin layer of ZnO as linker and induction sites. The preparation procedure involved a two-step process including first the growth of a thin layer of ZnO on the inner surface of the macroporous tube and then the formation of a continuous and dense ZIF-8 membrane. The results showed that a continuous ZnO layer of around 5 μm could be formed on the macroporous tube only in methanol/water synthesis solution. The ZnO layer acted as active sites to induce the uniform nucleation of ZIF-8 nuclei on their surface to guide the growth of a dense ZIF-8 membrane, an inorganic linker between the porous ceramic substrate and the membrane and a modification layer for the surface of the macroporous support. It was crucial to activate the ZnO layer with Hmim solution. Without activation, only some large ZIF-8 crystals could grow on the ZnO surface. The characterization of SEM, XRD and single gas permeation indicated that the quality of the ZnO layer and its activation played key roles in growing a continuous and dense ZIF-8 membrane. For the ZIF-8 membrane achieved under the optimum condition, the H2 permeance was about 2.14×10-7mol/(s•m2•Pa) and the ideal selectivities of H2/CO2, H2/N2 and H2/CH4 were 5.18，8.32，8.30, respectively, which displays good molecular sieving effect. The membrane also demonstrates good stability at 150 ºC.

Funds：

国家自然科学基金项目（No. 21076030, 21036006)、辽宁省自然科学基金项目(No. 201202027)、辽宁省高等学校优秀人才支持计划项目(No LR201008).

AuthorIntro：

李绍辉（1987-），硕士，辽宁辽阳人，E-mail:sunny_lsh@126.com 通讯作者：张雄福，教授/博士生导师，E-mail: xfzhang@dlut.edu.cn

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