ABSTRACT
Initial assumptions of the adsorption theory are completely matched with the assumptions of the lattice-gas model: the adsorbed state of the molecules corresponds to the filled cells, and the unoccupied cells are vacant, which was the basis for the development of molecular theory. The concentration dependences of the thermodynamic characteristics of adsorption systems are defined by the combined influence of surface heterogeneity and lateral interactions between the adsorbed particles. The adsorption equilibrium models will vary depending on how accurately the influence of the neighbouring points on the distribution of particles is taken into account. In other words, in the case of the equilibrium distribution of the particles adsorbed on an uneven surface it is important to take into account how the sites of one type are surrounded by other sites and how the nature of environment changes at different macroscopic parts of the surface.
