Recently the preparation of zeolite films/membranes has attracted a lot of interest, A zeolite film should have significantly better thermal and chemical stabilities than most conventional polymeric membranes. Zeolites, with their molecular scale pores, play important roles in shape-selective gas separation and catalysis. In situ crystallization of zeolite films on cellulose fibres or metal and ceramic substrates has been reported [1-4]. Jia et al. [5] and Sano et al. [6] have synthesized composite films of zeolite by embedding zeolite crystals in polymeric materials. However, lack of shape control and proper porosity or excessive void and crack formation were always observed. To solve these problems, an anodic alumina, with its high mechanical strength, abundance in cylindrical pores of uniform size, and richness in OH functional groups, was prepared and chosen as support for in situ growth of thin zeolite films/membranes. This study reports the first preparation of continuous AIPO4-5 films and ZSM-5 membranes grown in situ on anodic alumina supports.
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