Concept of Ideal Adsorbed Solution using Gibbsian Surface Excess Framework

Abstract

ABSTRACT A concept of creating an ideal multi-component- gas adsorbed phase by mixing pure gas adsorbed phases of the components at constant surface potential and temperature using the Gibbsian Surface Excess (GSE) framework of adsorption is proposed. The GSE provides the only unambiguously measured experimental quantity to describe the extent of adsorption. The actual amounts adsorbed can be estimated from the GSE only by making extraordinary assumptions about the volume and structure of the adsorbed phase. The correlations between the multi-component and pure gas GSE isotherms generated by the proposed concept closely resemble those for the classic IAST, which was developed by using the actual amounts adsorbed as the primary variables. The proposed correlations can be obtained by simply substituting the actual amount adsorbed of components in the corresponding IAST correlations by the GSE of the components. All pure and multi-component gas adsorption data published in the literature are GSE, and they ar...