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A simple molecular thermodynamic approach is applied to the study of theadsorption of gases of chain molecules on solid surfaces. We use a model basedon the Statistical Associating Fluid Theory for Variable Range (SAFT-VR)potentials [A. Gil-Villegas, A. Galindo, P. J. Whitehead, S. J. Mills, G.Jackson, A. N. Burgess, J. Chem. Phys. 106 (1997) 4168] that we extend byincluding a quasi-two-dimensional approximation to describe the adsorptionproperties of this type of real gases [A. Martinez, M. Castro, C. McCabe, A.Gil-Villegas, J. Chem. Phys. 126 (2007) 074707]. The model is applied toethane, ethylene, propane, and carbon dioxide adsorbed on activated carbon andsilica gel, which are porous media of significant industrial interest. We showthat the adsorption isotherms obtained by means of the present SAFT-VR modelingare in fair agreement with the experimental results provided in the literature

Adsorption of molecular gases on porous materials in the SAFT-VR approximation