Abstract
A unified approach to physica adsorption of heterogeneous solids is presented. In the case of single-gas adsorption the overall adsorption isotherms, derived by solving the fundamental integral equation for Langmuir's local isotherm and different energy distributions, are discussed. These isotherm equations are extended for Fowler-Gugaenheim and BET local adsorption isotherms. Moreover, the overall isotherms for single-gas adsorption are generalized for mixed-gas adsorption, adsorption from solutions of non-electrolytes and multi-solute adsorption from dilute solutions. The last section of this paper is devoted to the kinetics of localized adsorption of cases, the gas and liquid mixtures on energetically heterogeneous solid surfaces.
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