THE HYDROTHERMAL SYNTHESIS AND CHARACTERIZATION OF ZSM-5 ZEOLITE MEMBRANES USING TPABr AS A TEMPLATE

ZSM-5 zeolite films were prepared on the outer surface of porous -alumina ceramic tube by hydrothermal synthesis using tetrapropylammonium bromide (TPABr) as a template and the preparation conditions were discussed. The greater permeation flux of ZSM-5 zeolite membrane has been synthesized through repeating composition .On the basis of the analysis result of DTA/TGA of ZSM-5 zeolite, the heat treatment system of ZSM-5 zeolite membrane to exclude templates has been determined. The crystal of ZSM-5 zeolite film was characterized by XRD and SEM. The separation factor of this film was obtained in termsof the ratio of single hydrogen and nitrogen gas permeation flux. X-ray diffraction confirmed the thin layer on the surface of ceramic tube to be ZSM-5 crystalline phase, and SEM showed that individual ZSM-5 crystals had grown together in three dimensions and formed a continuous polycrystalline layer with thickness of about 10um. The ideal selectivity for H2 over N2 was 2.87 of zeolite membrane.