Abstract
Methane isotherms of NaY, MgY, CaY, SrY, and BaY zeolites are measured between 25 and 70 o C and upto 6760 kPa. All isotherms are of type I. The initial heat of adsorption for divalent cationic forms decreased with decreasing charge density (CaY>MgY>SrY>BaY) except for MgY. Similar anamoly was observed for methane adsorption on MgX (Zhang, S. Y.; Talu, O.; Hayhurst, D. T. J. Phys. Chem. 1991, 95, 1722) and it is attributed to incomplete dehydration (activation) at normal activation temperatures.. The cation type significantly affected adsorption properties even at loadings as high as 7.5 molecules/cavity
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