Abstract
We apply a comprehensive Monte Carlo simulation for the global oscillations inthe CO catalytic oxidation system on the Pt(100) surface based on awell defined lattice gas model. The basic reactive steps of the presentmodel follow the Langmuir–Hinshelwood mechanism incorporated withadsorbate-induced surface restructuring which follows the statistical theory offirst-order phase transitions. It is shown that oscillation only exists in acertain range of CO fraction in gas and the production rate of CO2 forms adouble-periodic oscillation, while the coverages of CO and O2 and fraction of (1 ×1) phase are in single-periodic oscillation. We give an explanation forthese phenomena. Moreover, the simulation results clearly show that thediffusion of adsorbed CO works to synchronize local oscillators and theoscillation in the system will disappear with the decrease of the diffusion.
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