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Journal of Physical Chemistry, vol.94, no.21, pp.8289-8296, 1990 (SCI-Expanded)
The work presented in part 1 of this study established that the sorption of anhydrous HX into dehydrated Na56Y progresses through a sequence of steps involving HX ionization and charge separation, oxygen framework protonation, formation of α-cage confined cation-anion contact ion pairs, and proton solvation by HX. A logical extension, which is the subject of this study, concerns the effect of extraframework alkali metal cation type (M = Li+, Na+, K+, Rb+, Cs+) on the sorption process. The question of the acidity of proton-loaded zeolites compared to Brønsted acid zeolites is addressed by using probe reactions with weak bases like ethane and cyclopropane. Additional insight into these systems is also obtained from a quantitative comparison of the kinetic and thermodynamic activation parameters for the dehydrohalogenation of proton-loaded zeolites exemplified by (HX)8Na56Y relative to the decationization (dehydroxylation) of Brønsted acid zeolites represented by H8Na48Y. © 1990 American Chemical Society.