Abstract
Silicalite-1, Na-ZSM-5 and B-ZSM-5 zeolite crystals were grown on a mesoporous silica layer to form MFI zeolite asymmetric layer for separation of CO 2 from CO 2/CH 4 binary mixture. Silicalite-1 demonstrated the highest crystallinity followed by B-ZSM-5 and Na-ZSM-5. The cubical and rectangular MFI zeolite crystal structures exhibited random orientation. The crystals appeared to interlock and entwine with each other to form a continuously polycrystalline film covering the surface of the silica support. Results from the permeation test indicated that the selectivity and permeation flux of CO 2 decreased as the temperature was increased but they increased with increase in pressure. B-ZSM-5 showed the highest CO 2/CH 4 selectivity of 8.17 followed by Na-ZSM-5 and silicalite-1 crystals with selectivity of 6.28 and 2.23, respectively.
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