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This paper presents the theoretical frameworks of isosteric heat of adsorption for sub-critical adsorption phenomena. The contribution by the adsorbed phase on the isosteric heat at different relative... pressure is accounted for. The isosteric heat of several adsorption pairs namely Water + Silica Gel, Propane + highly porous activated carbon type Maxsorb III, and Ethanol + spherical phenol resin treated with different mass ratios of KOH named as KOH6-PR, were evaluated using improved isotherm fitting with higher accuracy. Dubinin-Astakhov isotherm is employed to fit the isotherm data and the results were compared between such adsorbate/adsorbent pairs. Relatively lower values of isosteric heat at low coverage were observed and the effect of the isosteric heat at various coverages on the theoretical performance (COP) of the adsorption systems is also reported.show more
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