DYNAMIC-MODEL OF SELF-OSCILLATORY EVOLUTION IN CARBON-MONOXIDE OXIDATION OVER PT(110)

Based on the proposed reaction mechanism of catalytic CO oxidation on a Pt(110) surface, which has been well supported by experimental data, a kinetic model (six ODE's) was constructed accounting for the dynami cs of adsorbates on the surface. This model completely reproduces the qualitative features of the reaction dynamics under fixed parameters ( T, PCO, PO2), i.e. induction period before the beginning of self-oscil lations and further time evolution of shape, period and amplitude of s elf-oscillations up to the achievement of a stable limit cycle (or ste ady state). In addition, the model predicts the possibility of ''burst ing'' regimes (intermittence) of self-oscillations.