A membrane with high permeance was synthesized on porous alumina substrate by using the vapor-phase transformation method. The membranes were characterized by using XRD and SEM techniques. The XRD results showed that the membranes after a synthesis time of 24h consisted of pure NaA zeolite crystals. The SEM results showed that the membranes after a synthesis time of 48h consisted of intergrown zeolite crystals. The H2 permeance of the NaA zeolite membranes was higher than 2.0 x 10-6mol/m2sPa, and the maximum of the gas H2/C3H8 perm-selectivity was 7.15; higher than the corresponding Knudsen diffusion selectivity, which was 4.69.

NaA Zeolite Membrane with High Performance Synthesized by Vapor Phase Transformation Method. Z.L.Cheng, Z.S.Chao, H.Q.Lin, H.L.Wan: Chinese Journal of Chemistry, 2003, 21[11], 1430-2