Abstract
A-type zeolite membranes were synthesized on a porous support tube by a hydrothermal process. The membranes were polycrystalline, and the thickness was in the range of 0.4–3.8 μm. They were stable against repeated temperature changes over the range 35–300°C. Permeances of the membranes, determined using He, H 2O, H 2, CO 2, O 2, N 2, CH 4 and C 3H 8, were dependent on the size of permeate, and the maximum H 2/N 2 separation factor was 4.8 for a mixed H 2–N 2 feed. This suggests the permeation was, at least in part, affected by a molecular sieving mechanism, although the membranes contained some pores larger than the structural pores of the zeolite.
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