Prediction of Adsorption of Nonideal Mixtures in Nanoporous Materials

Abstract

The prediction of multicomponent adsorption equilibria from single-component adsorption experiments is a challenging and important problem. Predictions based upon the assumption of an ideal adsorbed solution (IAS) may give unacceptable errors, especially in the case of large differences in the size or the polarity of the adsorbate molecules. These differences in molecular properties generate differences in the chemical potential of the solid (ψ) that may be used to predict activity coefficients for nonideal adsorbed solutions (NIAS). The ψ plots for pure-gas isotherms identify ideal solutions and provide reliable predictions of mixture equilibria for nonideal adsorbed solutions.