07-23U

On the basis of simple lattice models the ground state of catalytic reaction of CO oxidation is investigated by incorporating the effect of inactive impurities and the nearest-neighbor interactions on a catalyst surface. Examples of a few ground-state phase diagrams for two lattice models, describing the cases of zero and nonzero impurity-impurity interactions, are considered. Nonuniform phases are obtained and the conditions of their existence are established in dependence on the interaction parameters.