Abstract
A single channel model for a three-way catalytic converter based on mechanistic kinetics is developed. The axi-symmetrical transient model uses one dimension for the gas phase and two for the solid phase. Light-off curves for cold start operation are used to show the capability of the model and the influence of diffusion in the washcoat on the light-off performance. It is shown that the concentration of reacting species and adsorbed intermediates undergo large changes during the light-off operation. The model is used to show the importance of dynamic adsorption during light-off. Under cold conditions a fresh catalyst can adsorb large amounts of material, which affects the light-off performance. Typical global kinetic models do not explicitly include the adsorption steps. Under normal driving conditions with the feed composition oscillating about the stoichiometric point, the concentration profiles in the washcoat can develop some surprising patterns.
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