New relationships between the characteristic energy of adsorption and the average effective diameter of carbon slit-like micropores: Part II. Adsorption of nitrogen and benzene in carbon slits and cylinders

The influence of the shape of micropores on the relationship between the parameters of Dubinin–Astakhov (DA) adsorption isotherm equation and the average diameter of pores (xav) is investigated. Nitrogen and benzene are chosen to be adsorbates. For both the molecules the Horvath–Kawazoe (HK) type relationships for adsorption in cylindrical carbon micropores are derived. Line and area average potential models are applied; moreover, for benzene, random and flat arrangement of molecules in cylindrical micropores is assumed. Basing on model calculations, it is shown that the same equations relating the parameters of DA isotherm and (xav) as proposed recently for slit-like micropores are valid also for cylindrical system and the only difference is in the values of constants occurring in both relations.