Abstract
NaY-type zeolite membranes, which were synthesized on the outer surface of a porous α-alumina tube by a hydrothermal process, were ion-exchanged with 0.1 mol l−1 solutions of either KCl, RbCl or CsCl. The degrees of ion-exchange were 62, 40 and 32% for K, Rb and Cs, respectively. Permeation properties of the ion-exchanged zeolite membranes were investigated at 35°C for single-component and binary mixture systems of CO2 and N2. The CO2/N2 selectivity for the equimolar mixture was in the order: Rb=K>Cs>Na. The sorptivities of CO2 and N2 onto the zeolites were also determined from sorption isotherms for the single-component and binary-mixture systems at 35°C. The CO2/N2 sorption selectivity was higher for the binary mixture systems than that for the single-component systems, and this was the major reason for the increase in permeation selectivity for the mixed feed.
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