The effects of synthesis parameters upon the property of Ce-ZSM-5 zeolite membranes grown onto porous α-alumina supports were investigated. The zeolite membranes synthesized were characterized by XRD, DTA/TG, FT-IR, SEM, EDS and single gas permeation. Orthogonal tests indicated that aging at lower temperatures and longer stirring times were preferred for Ce-ZSM-5 zeolite membranes. Lower alkalinity and higher Ce2O3/SiO2 favoured the formation of pure Ce-ZSM-5 structures. Higher alkalinity and lower SiO2/Ce2O3, impurities such as quartz and cerium oxide, which hinder the Ce-ZSM-5 formation were easily produced. Under optimum synthesis conditions, the permeances of H2, N2, CH4 and CO2 were 4.73 x 10-6, 1.56 x 10-6, 1.51 x 10-6 and 1.36 x 10-6mol/m2sPa, respectively; the ideal selectivity of membrane at room temperature for H2/CO2, H2/N2, H2/CH4 were 3.13, 3.03, 3.48, respectively.

Synthesis and Characterization of Ce-ZSM-5 Zeolite Membranes. Y.Cheng, J.S.Li, L.J.Wang, X.Y.Sun, X.D.Liu: Separation and Purification Technology, 2006, 51[2], 210-8