Reaction and Diffusion Phenomena in Catalyzed Diesel Particulate Filters Laboratory of Applied Thermodynamics, Aristotle University Thessaloniki

Format:

Conference/Event

Author/Creator:

Haralampous, O. A., author.

Conference Name:

SAE 2004 World Congress & Exhibition (2004-03-08 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2004

Summary:

The objective of this study is to explain the physical and chemical mechanisms involved in the operation of a catalyzed diesel particulate filter. The study emphasizes on the coupling between reaction and diffusion phenomena (with emphasis on NO2 "back-diffusion"), based on modeling and experimental data obtained on the engine dynamometer. The study is facilitated by a novel multi-dimensional mathematical model able to predict both reaction and diffusion phenomena in the filter channels and through the soot layer and wall. The model is thus able to predict the species concentration gradients in the inlet/outlet channels, in the soot layer and wall, taking into account the effect of NO2 back diffusion. The model is validated versus engine dyno measurements. Two sets of measurements are employed corresponding to low-temperature "controlled" regenerations as well as high-temperature "uncontrolled" conditions. Good agreement is observed between measured and computed results in both regeneration modes. It is concluded that at low temperatures, the main reaction mechanism involves NO2 produced on the catalytic sites and partially diffusing back to the soot layer (re-cycling). At high temperature regeneration modes, NO2 is not favored due to chemical equilibrium limitations and therefore the main reaction path involves oxygen reaction with soot

Notes:

Vendor supplied data

Publisher Number:

2004-01-0696

Access Restriction:

Restricted for use by site license