Prediction of the multicomponent adsorption equilibrium of supercritical gases on activated carbon

The performance of adsorption potential theory model is examined with the experimental data of supercritical multicomponent adsorption equilibrium of CH₄/N₂/H₂ mixture on activated carbon JX-101. The effect of calculation of pseudo-saturated pressure and adsorbate mole volume on the prediction performance of the model is investigated in detail. The adsorption potential theory model predicts the amount adsorbed from the mixture quite well for methane, nitrogen, and the total amount adsorbed. However, it does not function well for hydrogen, the weakly adsorbed component. The reason might be attributed to the larger relative error for the small quantity of adsorption. The evaluation approaches for the adsorbate mole volume have little effect on the prediction accuracy, but the prediction result is sensitive to the method of calculation of pseudo-saturated pressure.