ADSORPTION MECHANISMS AND SURFACE HETEROGENEITY IN THE OXIDATION REACTION OF CO

A Monte Carlo simulation study is made of the sensitivity of the CO ox idation reaction to changes in the characteristics of the catalyst's s urface on which the type of oxygen adsorption mechanism is dependent. Infinite rate models of the Ziff, Gulari, and Barshad (ZGB) type, and mechanisms having kinetics parameters of actual experiments from the l iterature are studied. It is shown that, if linear adsorption is assum ed, the structural insensitivity becomes apparent in the phase diagram but not in the production of CO2. In the case of structural sensitivi ty it is seen that surface heterogeneity leads to a change in the char acter of the phase transition curve, and also allows information about the surface to be obtained from the shape of the transition curve. (C ) 1998 American Institute of Physics. [S0021-9606(98)01833-9]