Modeling the simultaneous oxidation of CO and H2 on Pt – Promoting effect of H2 on the CO-light-off

A microkinetic model is developed to simulate the promoting effect of H2 on the light-off of CO oxidation on platinum. It is shown that the coupling of the CO and the H2 oxidation sub-mechanisms, via the hydroxyl intermediate and its reaction with CO to carboxyl, is crucial to describe the process. This carboxyl-path was not considered in previous modeling studies.

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► Microkinetic model to simulate the promoting effect of H2 on the CO oxidation on Pt.
► Coupling of the CO and the H2 oxidation sub-mechanisms.
► Carboxyl path is crucial to describe the process.
► Estimated parameters are in accordance with experimental values.
► Developed mechanism is thermodynamically consistent.