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NOx-Particulate Filter (NPF) vs. NOx Storage Catalyst (NSC): Evaluation of an After-Treatment Concept to Meet Future Diesel Emission Standards
Technical Paper
2005-01-1087
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Simultaneous particulate and NOx reduction represent the next step in the reduction of diesel emissions. One of the most promising concepts to achieve this target involves the combination of two technologies already in use in the after-treatment technology: Diesel Particulate Filter and NOx Storage Catalyst. One of the most controversial points is the possibility to integrate these two functions in the same component, the so called NOx Particulate Filter (NPF). The first purpose of this project was to compare NOx Storage Catalysts (NSC) and NPF in terms of overall efficiency, especially in terms of changes of the NOx absorption efficiency over the cross section of the catalyst. The results showed a better behavior of the NPF. Theories concerning the reasons are provided, even if further investigations to fully explain this phenomenon are still necessary. As a second step, the NOx emissions for the NPF were analyzed during a test cycle with simple NOx regeneration (DeNOx) and combined soot and NOx regenerations (DeSoot- DeNOx), showing an overall NOx reduction capability of around 50%. Finally, different strategies to reduce temperature peaks and NOx slip were implemented. The timing of the rich spikes during DeSoot operation was optimized in order to reduce the NOx release.
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Citation
Ranalli, M., "NOx-Particulate Filter (NPF) vs. NOx Storage Catalyst (NSC): Evaluation of an After-Treatment Concept to Meet Future Diesel Emission Standards," SAE Technical Paper 2005-01-1087, 2005, https://doi.org/10.4271/2005-01-1087.Also In
Diesel Exhaust Emission Control and Modeling on CD-ROM from the SAE 2005 World Congress
Number: SP-1981CD; Published: 2005-04-11
Number: SP-1981CD; Published: 2005-04-11
References
- Ranalli M. Schmidt S. Watts L. NOx-Particle Filter (NPF): Evaluation of an After-Treatment Concept to Meet Future Diesel Emission Standards SAE Paper 2004-01-0577
- Ranalli M. Schmidt S. Diesel Fuel Vaporizer: Path to a Reliable DPF Regeneration MTZ 9 2004
- Imarisio R. Peters B. Sebastiano, G. M. Rossi Pinson, J. Boretto, G. Buratti R. Diesel Strategies Towards Fuel Neutral European Emissions Standards ATA Paper 04A5010
- Ranalli M. Hossfeld C. Kaiser R. Schmidt S Elfinger G. Soot Loading Distribution as a Key Factor for a Reliable DPF System: an Innovative Development Methodology SAE 2002-01-2158
- Hossfeld C. Kaiser R. Russbeladung in Dieselpartikelfilter-Systemen MTZ 9 2003