Influence of decationation and dealumination on sorption by mordenite and clinoptilolite

Abstract

The sorption has been examined of Kr, CO₂, and H₂O in Na-mordenite and in each of a series of decationated and progressively dealuminated mordenites derived from it. The sorption of H₂O in a similar series of clinoptilolites has been investigated, which, with the results for Kr and CO₂ previously obtained, has allowed a comparison of the two groups of sorbents for a non-polar molecule (Kr), a molecule with a large linear quadrupole moment (CO)₂, and one with a large dipole moment (H₂O). The various effects of decationation and dealumination upon isotherms, heats, energetic heterogeneity, and differential entropies of sorption have been traced and compared for Kr and CO₂, and in part for H₂O. Studies have also been made of the competitive sorption of CO₂ and H₂O in representative sorbents of the same series of clinoptilolites and mordenites.