The effect of intermediate layer on synthesis and gas permeation properties of NaA zeolite membrane |
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Authors: | Nandini Das Debtosh Kundu Minati Chatterjee |
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Affiliation: | (1) Sol–Gel Division, Central Glass & Ceramic Research Institute, CSIR, Jadavpur, Kolkata, 700 032, India |
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Abstract: | NaA zeolite membrane coating was successfully synthesized on an alumina porous disc by hydrothermal treatment. The effects
of synthesis parameters, such as seeding condition (in situ, ex situ), synthesis time, synthesis stages, application of intermediate
layer, etc., on membrane characteristics were investigated. Surface seeding accelerates the zeolite crystallization process
on the support surface, and also enhances the formation of homogeneous NaA zeolite layer. But the main problem associated
with membrane coating synthesis is crack formation. Formation of crack was reduced by applying intermediate layer, between
the support surface and seed layer. A thin Boehmite layer was applied to the support surface before applying seed crystals
to enhance the adherence between zeolite seed layer and boehmite layer by hydrogen bonding and also to increase the mechanical
strength of the membrane layer. The quality of the membrane layer can be improved by employing the multi-stage coating methods.
The permeance of O2, N2 decreased as kinetic diameter of gases increased, which shows the molecular sieving effect of the NaA membrane. The permselectivity
of O2/N2 was 1.9–2.0. This value of permselectivity ratio is higher than Knudsen diffusion ratio 0.94; it was also confirmed the molecular
sieving properties of synthesized NaA zeolite membrane. |
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