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Date of Publication:2022-10-10

Journal:过程工程学报

Volume:3

Issue:3

Page Number:251-255

ISSN No.:1009-606X

Abstract:Zeolite NaA membrane was prepared hydrothermally on the outer-surface of
   a porous a-alumina tube (pore size of 3~5 |im) using a gel with the
   composition of SiO-2:Al-2O-3:Na-2O:H-2O=2:1:2:200 (mole ratio). Before
   the hydrothermal reaction, the support was seeded with NaA zeolite,
   which was already dispersed in diluted water glass. After several
   hydrothermal synthesis steps, a dense intergrown zeolite crystal layer
   about 15~20 nm in thickness was formed on the outer surface. The zeolite
   crystals were about 3~5mum in size and there was no apparent cracks
   between them, as observed from SEM images and permeation measurement.
   The permeance of H-2 and N2 was 3.05x10~-6 and 4.4*l0~-7 mol/(m~2-s-Pa),
   respectively. The permselectivity of H-2/N-2 and H-2/C-3H-8 was 6.9 and
   15.6 under room temperature, higher than the respective Knudsen
   diffusion ratio of 3.74 and 4.69.

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