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Modeling of slow dynamics in the oxidation of CO over supported silver



The oxidation of CO over aluminum-supported Ag was studied at 147°C using transient experiments. Long-time-scale dynamics were observed that could not be explained by previously postulated kinetic mechanisms for this reaction system. A model is presented with kinetic parameters estimated from steady state and transient data that is able to reproduce a variety of cycled feed stream experiments. The model incorporates a slow reversible step which forms an adsorbed oxygen species that blocks reaction sites.

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