Abstract

This paper shows that the exponential adsorption isotherm, which was proposed originally for describing gas adsorption on solids with large pores, is also useful for studying adsorption on heterogeneous microporous solids. For microporous solids, this isotherm generates simple equations for the adsorption potential distribution, the differential enthalpy of adsorption, and the differential entropy of adsorption. The utility of these equations for calculating the above-mentioned thermodynamic functions is illustrated for benzene adsorption isotherms on two different activated carbons.

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