Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 106, Issue 1-3, Pages 140-146Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2007.02.037
Keywords
ion exchange; gas separation; zeolite membrane; SAPO-34; gas adsorption
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Ion exchange of H-SAPO-34 zeolite membranes with Li+, Na+, K+, NH+, and Cu2+ cations in non-aqueous solutions increased CO2/CH4 ideal and separation selectivities up to 60%, but increased H-2/CH4 ideal and separation selectivities less than 18%. Ion exchange decreased permeances, and the decrease was larger for large cations, apparently due to steric hindrance. Exchange did not degrade SAPO-34 crystals or membranes, but changed adsorption properties for some ions. (c) 2007 Elsevier Inc. All rights reserved.
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