Abstract
The virial excess mixing coefficient (VEMC) model is proposed to describe multicomponent adsorption equilibria for nonideal systems. It expresses a nonideal adsorbed mixture by an ideal adsorbed solution with VEMC corrections. It reduces to the ideal adsorbed solution theory (IAST) when depicting an ideal adsorbed mixture. The model is thermodynamically sound and accurate in describing systems. Adsorbed-phase activity coefficients can be evaluated with the model. The VEMC model is used to investigate binary and ternary adsorption of hydrogen sulfide, carbon dioxide, and propane on H-mordenite and binary adsorption of n-hexane and water on BPL activated carbon.
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