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Multilayer Adsorption of Gases on Heterogeneous Solid Surfaces

Analytical approximations are considered for isotherms of multilayer adsorption on heterogeneous solid surfaces. Particular expressions for multilayer adsorption isotherms are developed, for the adsorption systems yielding the DR and the Tóth adsorption isotherms in submonolayer coverage regions. Illustrative numerical calculation are made for two adsorption systems obeying to DR and to Tóth empirical equations, respectively.