Abstract
The article examines consistent mathematical micro- and macro-level models of CO oxidation on platinum-group metals. New mechanisms responsible for the excitation of oscillations are studied in detail by simulation. Micro-level oscillations may arise in parameter-space regions where the corresponding macro model has a limiting cycle, a bistability, or a unique stable steady-state solution. In the latter case, necessary conditions for the excitation of oscillations include fluctuations in the concentration of adsorbed particles, which are characteristic of micro models of small-volume systems, and a special arrangement of the macro-model trajectories on the phase plane producing sensitivity to small perturbations or excitability of the medium.
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Kurkina, E.S., Semendyaeva, N.L. Oscillation-Generating Mechanisms in Stochastic and Deterministic Models of a Catalytic Reaction. Computational Mathematics and Modeling 14, 319–333 (2003). https://doi.org/10.1023/A:1024499227068
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DOI: https://doi.org/10.1023/A:1024499227068