Continuous and perfect single-layer B-Al-ZSM-5 zeolite membranes with c-axis orientation, self-transformation from B-containing porous glass disks with rough and uneven surfaces full of pits, have been in- situ prepared on the substrates surfaces in a mixed vapor of ethylenediamine, tri-n-propylamine and H_2O. The thickness of the membranes is ca . 60 μm. Under the conditions of 20 ℃ and 0.1 MPa pressure difference, the permeabilities of H_2, O_2 and N_2 through the calcined B-Al-ZSM-5 zeolite membranes are 2.298 * 10~(-8), 1.176 * 10~(-8) and 1.368 * 10~(-9) mol/(m~2·s·Pa), respectively. The calculated values of ideal selectivities of H_2 and O_2 over N_2 are 16.8 and 8.60, respectively. The data indicate that the calcined zeolite membranes are non-pinhole, non-crack, continuous and perfect.

Key words: ZSM-5, ZEOLITE, HYDRO-THERMAL REACTION, CRYSTAL GROWTH