Abstract
Results of Monte Carlo simulations of CO oxidation with site blocking, and of the Lotka model (A(gas) → A(ads), B(ads) → B(gas), A(ads) + B(ads) → 2B(ads)) are presented. The introduction of a site blocking adsorbate can lead to oscillations in CO oxidation. The system is bistable for certain coverages of the site blocking adsorbate; adsorption and desorption of that adsorbate drive the system from one stable state to the other and back. The oscillations in the Lotka model are due to avalanches of A's that are converted into B's by the autocatalytic step. Normal rate equations are unable to describe these systems correctly.
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