Abstract
A generalized adsorption theory was developed following the previously presented (1) theory of capillary condensation by deriving first the expression of the possible course of adsorption without the pressure variable, and then completing this for the pressure dependence of equilibrium by applying Polanyi's adsorption potential concept. The equation derived is V R = k R ln p 0+p m p+p m 3 y ln p 0+p m p m ζ − ln p 0+p m p+p m δ , where k R and ζ are constants for a given temperature, y is the power of the variation of potential with distance from a given adsorption site, and p m is provisionally the pressure corresponding to a supposed static adsorption equilibrium with points of maximum surface potential. The equation is based on the assumption of a different adsorption potential for each surface site, combined with a hemispherical “drop formation” on each site as the relative pressure increases. It is capable of representing substantially all general forms of adsorption isotherms and contains four adjustable constants. It has a greater flexibility and additional useful properties in comparison with the previous theory (1).
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