EFFECT OF ELEY–RIDEAL PROCESS ON THE PHASE DIAGRAM OF A MONOMER–DIMER CATALYTIC REACTION ON (001) SURFACE AND SUBSURFACE OF A SIMPLE CUBIC STRUCTURE

Abstract

We have investigated the effects of the Eley–Rideal (ER) process on the phase diagram of the Langmuir–Hinshelwood (LH) type monomer–dimer ( CO – O 2) catalytic reaction on (001) surface and subsurface of a simple cubic structure. With the consideration of a new pathway in which a dimer is adsorbed in such a way that it takes one surface site whereas second site may be from a surface or from a subsurface, a situation close to experiments is observed, i.e., with slight introduction of the monomer ( CO ), the production of AB2 starts. In this case, the qualitative trend of surface oxygen coverage is consistent with the experimental situation.