A B-Al-MFI-type zeolite membrane was synthesized in situ on the surfaces of a boron-silicon porous glass disc by substrate self-transformation in the vapor of ethylamine and H2O. Both XRD and SEM showed that the zeolite crystals on the surfaces of the porous glass disc were of random orientation. The crystal sizes in the membrane range from 15 to 25μm. The thickness of the membranes in the form of a one-crystal layer was 10 to 20μm. The permeabilities of the calcined B-Al-MFI-type zeolite membrane to O2 and N2 were 0.095 x 10-8 and 0.15 x 10-8mol/m2sPa, respectively. The calculated ideal selectivity of O2/N2(0.63) was obviously lower than that for Knudsen behaviour (0.94) and for the substrate (0.91).

In situ Synthesis of B-Al-MFI-Type Zeolite Membrane on a Porous Glass Disc by Substrate Self-Transformation. W.Y.Dong, Y.Ren, Y.C.Long: Acta Chimica Sinica, 2000, 58[11], 1311-5