This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
NOx Reduction Potential of V-SCR Catalyst in SCR/DOC/DPF Configuration Targeting Euro VI Limits from High Engine NOx Levels
Technical Paper
2009-01-0626
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
To reach the EPA ‘10 and Euro VI strict regulations of PM and NOx for heavy duty trucks it will be necessary to apply integrated catalytic solutions for removal of both PM and NOx. The described system consists of an alternative catalytic configuration where the SCR catalyst is placed downstream of the diesel engine followed by diesel injection over an oxidation catalyst (DOC) and a catalysed diesel particulate filter (cDPF). One of the advantages of this system configuration is that the SCR catalyst in this way is protected from high temperatures during filter regeneration and that the SCR catalyst has the fastest heat up required for good performance in cold test cycles. The SCR catalyst can therefore be of a standard V-based type that is already proven technology for Euro IV and Euro V compliance in Europe. Another advantage is that the DOC and cDPF act as clean-up catalysts for any possible ammonia slip from the SCR catalyst. The system was tested on an engine test bed using a Euro II 12-l truck engine having high engine-out NOx emissions in order to demonstrate the NOx reducing potential of this system configuration. Experiments were performed with transient cycles and various urea dosing strategies. It was shown that Euro VI NOx emission limits could be achieved over the SCR catalyst on the ETC cycle with NOx emissions being reduced from 10 g/kWh down to below 0.4 g/kWh, the SCR catalyst thus achieving >95% NOx conversion.
Recommended Content
Authors
Topic
Citation
Gekas, I., Vressner, A., and Johansen, K., "NOx Reduction Potential of V-SCR Catalyst in SCR/DOC/DPF Configuration Targeting Euro VI Limits from High Engine NOx Levels," SAE Technical Paper 2009-01-0626, 2009, https://doi.org/10.4271/2009-01-0626.Also In
References
- Gekas I. Gabrielsson P. Johansen K. Reczek W. Cartellieri W. “Performance of a Urea SCR System Combined With a PM and Fuel-Optimized, Heavy-Duty Diesel Engine Able to Achieve the Euro V Emission Limits” SAE Paper 2002-01-2885
- Johnson T. “Diesel Emission Control in Review,” 2007-01-0233
- Zink U. “HD Emission Control Filter and Substrate Technology” SAE International HDDEC Gothenburg Sweden 11-12 September 2007
- Charlton S. “US Perspective on Engine Development,” SAE International HDDEC Gothenburg Sweden 11-12 September 2007
- Becher S. “Injection System and Air System Contribution to Advanced Combustion Concepts for HD Engines,” SAE International HDDEC Gothenburg Sweden 11-12 September 2007
- Dreisbach R. “Emission Reduction Technology Non-rad Engines” SAE International HDDEC Gothenburg Sweden 11-12 September 2007
- Lamping M. MTZ 51 57 January 2007
- Gurupatham A. He Y. “Architecture Design and Analysis of Diesel Engine Exhaust Aftertreatment System and Comparative Study with Close-coupled DOC-DPF System” 2008-01-1756
- Lambert C. et al. “Combined SCR/DPF System for Tier 2LDT” Ninth CLEERS Workshop May 3, 2006
- Lambert C. et al. “Urea SCR and DPF System for Tier 2 Diesel Light-Duty Trucks DEER Conference August 24 2006
- Johnson T. “Diesel Emission Control in Review,” SAE 2008-01-0069
- Dittler A. “System Integration of Engine and Aftertreatment Engineering,” SAE International HDDEC Gothenburg Sweden 11-12 September 2007
- Müller W. “Aftertreatment Systems for Commercial Vehicle Diesel Engines” 6th International CTI Forum January 2008