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Principles of the theory of adsorption of large molecules in pores with nonuniform walls
Authors:Yu K Tovbin
Institution:(1) State Research Center of the Russian Federation “L. Ya. Karpov Institute of Physical Chemistry”, 10 ul. Vorontsovo pole, 103064 Moscow, Russian Federation
Abstract:Principles of the theory of adsorption of large molecules blocking more than one adsorption center on a surface in slit-like pores are proposed. The theory takes into account lateral adsorbate—adsorbate interactions and nonuniformity of the pore walls. The equations of adsorption isotherms are derived using the cluster approach. The lateral interactions are taken into account in the quasi-chemical approximation, preserving effects of direct correlations, and in the mean field approximation without effects of correlations. The following problems are discussed: 1) distinguishing of partial contributions of nonuniform adsorption centers on the pore walls; 2) exact solution for dimer adsorption in a two-layer pore with uniform walls; 3) basic types of adsorption isotherms, for which the differences are due to various orientations of the adsorbate in micropores with uniform walls; 4) estimates of the pressure responsible for volume filing of micropores; and 5) the effect of nonuniformity of the pore walls on the pressure values. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1467–1478, August, 1999.
Keywords:adsorption  isotherm  slit-like pores  nonuniform surface  blocking of adsorption centers  lattice-gas model  cluster approach  quasi-chemical approximation  model of contacts
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