Bifurcation Dynamics in Periodically Driven CO-Oxidation on Platinum Catalyst Surfaces

Carbon monoxide ( CO ) oxidation is a crucial reaction in heterogeneous industrial catalysts and has been extensively investigated. This paper presents a mathematical model describing the oscillatory regimes of CO- oxidation over platinum catalysts based on the Langmuir-Hinshelwood mechanism. We discuss the application of periodic forcing to catalytic CO -oxidation on platinum surfaces within the oscillatory regime. Our numerical study examines the bifurcation behavior during CO -oxidation on platinum catalyst surfaces. We observe a transition from simple periodic chemical oscillations through a sequence of period-doubling bifurcations to deterministic chaos. Additionally, intermittent chemical oscillations and other behaviors such as hysteresis, band-merging, sudden-widening, and sudden-destruction are observed at various control parameter values. We employ numerical tools such as bifurcation diagrams, phase portraits, Poincar e ´ maps, and trajectory plots to characterize the periodic and chemical oscillations.