Abstract
A chemically consistent dynamic kinetic model of the NH 3 – NO / NO 2 reacting system was developed on the basis of an extensive fundamental research carried out over a commercial V 2 O 5 – WO 3 / TiO 2 selective catalytic reduction (SCR) catalyst for automotive applications. Intrinsic kinetics of all the selective and non-selective reactions were estimated by fitting a systematic set of transient runs over the powdered catalyst. The resulting model accounts for the complex SCR chemistry over a wide range of experimental conditions ( T = 160 – 450 ∘ C ; NO / NO 2 = 0 → ∞ ): in particular, it takes into account formation, storage, decomposition and reaction of NH 4 NO 3 , which resulted in a good description of the selectivity to all the major N-containing products ( N 2 , NH 4 NO 3 , HNO 3 , N 2 O ). The model was validated by independent dynamic runs both over powdered catalyst at the microreactor scale and over monolith catalysts in engine test bench runs at the full scale.
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