Modeling of multi-layer catalysts and application in deNOx system

Grigorios  Koltsakis, Aristotle University Thessaloniki

The combined use of a lean-NOx trap with a passive NH3-SCR system has already been proposed as an elegant technology to meet the stringent deNOx requirements without the hardware investment associated to external reductant supply. The LNT-SCR combination may be realized either via in-series installation of two separate devices or by applying a two washcoat layers on the same substrate. The presentation will deal with the problem of modeling such combined LNT-SCR concepts, starting from model calibration examples and continuing with exemplary simulation results. Special focus is given to the importance of “internal” diffusion modeling within the washcoat, which is a critical model feature especially in the case of multi-layer LNT-SCR technologies.

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