SPREADING PRESSURE DEPENDENT EQUATION FOR ADSORBATE PHASE ACTIVITY-COEFFICIENTS

The Spreading Pressure Dependent (SPD) equation was developed to calculate adsorbate phase activity coefficients which can be used with the Adsorbed Solution Theory to describe multicomponent gas adsorption equilibria. The predictions by the SPD equation and other well-known models (the Vacancy Solution Model, the Real Adsorbed Solution Theory) were compared with the experimental data for binary and ternary mixtures of CO//2, H//2S, and C//3H//8 on hydrogen mordenite. The C//3H//8-containing binary mixtures and the ternary mixture show strong non-idealities and azeotrope-like crossovers in the composition domain. The SPD equation, using experimentally determined parameters, gave excellent prediction of multicomponent data.