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 dynamics 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-oscillations and further time evolution of shape, period and amplitude of self-oscillations up to the achievement of a stable limit cycle (or steady state). In addition, the model predicts the possibility of “bursting” regimes (intermittence) of self-oscillations.