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Improvement of Low-Temperature Performance of The NOx Reduction Efficiency on the Urea-SCR Catalysts
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 08, 2013 by SAE International in United States
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Diesel engine has a good fuel economy and high durability and used widely for power source such as heavy duty in the world. On the other hand, it is required to reduce NOx (Nitrogen Oxides) and PM (Particulate Matter) emissions further from diesel exhaust gases to preserve atmosphere. The urea-SCR (Selective Catalytic Reduction) system is the most promising measures to reduce NOx emissions. DPF (Diesel Particulate Filter) system is commercialized for PM reduction. However, in case that a vehicle has a slow speed as an urban area driving, a diesel exhaust temperature is too low to activate SCR catalyst for NOx reduction in diesel emissions. Moreover, the diesel exhaust temperature becomes lower as a future engine has less fuel consumption.
The purpose of this study is reduction of NOx emission from a heavy-duty diesel engine using the Urea SCR system at the low temperature. The performance of NOx reduction especially at low temperature was investigated to the influence of NOx/NO ratio at the inlet of Urea-SCR catalyst and the effect of NH₃ adsorption on the Urea-SCR catalyst. The SCR catalysts were coated by the zeolite with different active metals. The performance of NOx reduction at low temperature was observed by the effect of NOx/NO ratio at the inlet gas of Urea-SCR catalyst and the NH₃ adsorption on the Urea-SCR catalysts.
The NOx reduction efficiency was tested using simulated gas experiment. In this study, the improvement of NOx reduction catalyst at the low temperature is discussed about tested new material catalysts. These catalysts were selected from the viewpoints of NH₃ and NO adsorption amounts. Drastic NOx reduction efficiency improvement at low temperature (around 200 degree C) would be achieved using copper zeolite catalyst. The next step, emissions reduction effect was discussed from the results of the engine experiments under steady-state and transient conditions. The latest results and problems were reported with the results from the simulated gas experiments and engine experiments.
CitationSato, S., Sato, S., and Hosoya, M., "Improvement of Low-Temperature Performance of The NOx Reduction Efficiency on the Urea-SCR Catalysts," SAE Technical Paper 2013-01-1076, 2013, https://doi.org/10.4271/2013-01-1076.
- Sato Sinya et al: The study of NOx reduction using Urea-SCR system for a heavy-duty diesel engine, 20045293 Proceedings of JSAE Annual Congress(2004)
- Hiranuma Satoshi et al: Aftertreatment System for Commercial Diesel Engine (First Report), 20085359 Proceedings of JSAE Annual Congress(2008)
- Kowada Minoru et al: Development of PM and NOx Reduction Aftertrestment System for Heavy-Duty Commercial Vehicle, 20105725 Proceedings of JSAE Annual Congress(2010)
- Hisatomi Kenji et al: Development of new diesel engine for medium duty commercial vehicle met post new long-term exhaust emission regulations without the urea-SCR, 20115819 Proceedings of JSAE Annual Congress(2011)
- Hirabayashi Hiroshi et al: Development of New DPR, 20105682 Proceedings of JSAE Annual Congress(2010)
- Sakamoto Takayuki et al: Study on effects of various reductants for Nitrate in LNT catalyst and on CO generation by Pd loaded DOC catalyst, 20045293 Proceedings of JSAE Annual Congress(2004)
- Kondo Nobuhiri et al: Development of Lean NOx Trap System for Commercial Vehicle, 20045121 Proceedings of JSAE Annual Congress(2004)
- Lambert Christine et al : Development of the 2011MY Ford Super Duty Diesel Catalyst System, 2011 DEER Conference, October 3-6,2011
- Tang Weiyong et al : Sulfur Effect and Performance Recovery of a DOC + CSF + Cu-Zeolite SCR Sysrtem, 2011 DEER Conference, October 3-6,2011
- Suzuki Hisakazu et al: N2O Emission Characteristics of Post New Long Term Urea SCR Vehicles, 20115695 Proceedings of JSAE Annual Congress(2011)