FAU-type zeolite membranes with different Si/Al ratios were hydrothermally synthesized on the outer surface of a porous α-Al2O 3 support tube. The permeances of the membranes to CO2, CH4 and N2 were then measured at 308 K for single-component and equimolar binary systems. The separation properties were dependent on both the Si/Al ratio and the ion-exchange treatment. For single-component systems, a lower Si/Al ratio resulted in the incorporation of a larger number of Na+ ions. For a CO2-CH4 mixture, both CO2 permeances and CO2/CH4 selectivities were approximately half the values obtained for a binary CO 2-N2 mixture. The highest selectivities, obtained using the NaX(1) zeolite membrane, were 28 for CO2/CH4 and 78 for CO2/N2. The RbY, RbX(1) and RbX(2) zeolite membranes showed larger CO2 permeances, compared with those of the original Na-type membranes. Ion-exchange with K+ ions was the most effective for the NaY zeolite membrane in that both the CO2 permeance and the CO2/CH4 selectivity were increased.
CITATION STYLE
Hasegawa, Y., Tanaka, T., Watanabe, K., Jeong, B. H., Kusakabe, K., & Morooka, S. (2002). Separation of CO2-CH4 and CO2-N 2 Systems Using Ion-exchanged FAU-type Zeolite Membranes with Different Si/Al Ratios. Korean Journal of Chemical Engineering, 19(2), 309–313. https://doi.org/10.1007/BF02698420
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