3D Modelling of a Diesel Particle Filter: Kinetic Aspects

Kirsten  Leistner, IFP / University of Paris VI

The modelling of Diesel particulate filters (DPF) is of crucial importance due to the ever-more stringent regulations on particulate emissions. Soot oxidation is a complex process and a detailed description challenging, because of the varied character of soot and the formation and migration of surface complexes. Not surprisingly, most studies use very simplified kinetic schemes (< 10 steps). Previous dissertations adopt mechanisms with 3 steps only. Global kinetic parameters are relatively well documented in literature, but elementary parameters need to be integrated. The objective of the current PhD thesis carried out at IFP is to develop a kinetic model for the oxidation of carbon particles and subsequently link it to a 3D model describing DPF regeneration. Two different approaches to derive a semiglobal reaction scheme are presented. A relatively simple surface mechanism involving a single surface complex is proposed based on the reaction steps proposed in literature. This mechanism is then coupled with a fixed bed reactor model implemented in the IFP Exhaust library of the simulation software AmeSim.

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