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The task of matching engine, control system and catalytic converter has become very complex as the automotive industry strives to meet stringent demands for pollution abatement. To address the need for a robust, accurate modeling tool we have created a microkinetics-based simulation program that describes the reactions taking place on the surface of a catalytic converter. This chemically detailed approach permits the construction of faithful simulations of both steady state and transient performance of the catalyst using a combination of experimental measurements, literature data and quantum chemical calculations. The model can be coupled to existing simulations of the engine and control elements, notably those based on GT-Power.