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Feasibility Study of Urea SCR Systems on Heavy Duty Commercial Vehicles
Technical Paper
2004-01-1944
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Four urea SCR systems were developed and evaluated on a C/D and on the road to investigate their potential for Japanese emission regulations in 2005 and beyond. Test results showed that NOx conversion ratios were 50 to 70% during the Japanese D13 mode cycle, and the ratios under the transient driving cycle were lower than those tested during a steady state. Unregulated emissions, such as benzene, aldehyde and benzo[a]pyrene, existed either at a trace level using the oxidation catalyst, or lower than a base diesel engine, when no oxidation catalyst was used. The health effects of particulate matter emitted from the SCR system were almost the same as those from conventional diesel engines, as evaluated by the Ames test and in vitro micronucleus test. Thermal degradation products, such as cyanuric acid and melamine, were two to four figures lower compared with the toxicological information of Safety Information Resources Inc. (SIRI).
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Citation
Hori, M. and Oguchi, M., "Feasibility Study of Urea SCR Systems on Heavy Duty Commercial Vehicles," SAE Technical Paper 2004-01-1944, 2004, https://doi.org/10.4271/2004-01-1944.Also In
References
- Helden R. et al. Engine Dynamometer and Vehicle Performance of a Urea SCR-System for Heavy-Duty Truck Engines SAE 2002-01-0286 2002
- Gekas et al. Urea SCR Catalyst System Selection for Fuel and PM Optimized Engine and a Demonstration of a Novel Urea Injection System SAE 2002-01-0289 2002
- http://www.dieselnet.com/news/0308ema.html
- Ball J.C. A Toxicological Evaluation of Potential Thermal Degradation Products of Urea SAE 2001-01-3621 2001