We studied the coverage dependence of the differential heat of adsorption in the presence of an order–disorder phase transition, by employing theoretical mean-field and quasi-chemical approaches and Monte Carlo simulation, in the framework of the lattice-gas model. For a square lattice, with...

The phase transition of a fluid adsorbed in a heterogeneous system is studied within a mean-field approach to the lattice gas model with quenched impurities. Despite the different origin of the heterogeneity (spatial variation of binding energy or fluid coordination numbers), the fluid can...

We report on a Monte Carlo study of the differential heat of adsorption on, square, triangular and honeycomb two-dimensional lattices. The influence of the connectivity on the main scaling parameters in the critical regime is analyzed. The simulation data are compared with mean-field and...