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A Study on the Improvement of NOx Reduction Efficiency for a Urea SCR System
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 01, 2015 by SAE International in United States
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Urea SCR (Selective Catalytic Reduction) exhaust after-treatment systems are one of the most promising measures to reduce NOx emissions from diesel engines. Both Cu-zeolite (Cu-SCR) and Fe-zeolite (Fe-SCR) urea SCR systems have been studied extensively but not many detailed studies have been conducted on the combination of both systems. Thus, we carried out studies on such Combined-SCR systems and their capability to reduce NOx under various engine operating conditions. We also conducted transient engine tests using different catalyst systems to compare their performance. The results show that combined-SCR systems can reduce NOx more effectively than Fe-SCR or Cu-SCR alone. The best NOx reduction performance was achieved at a Cu ratio of 0.667 (i.e. Fe: Cu =1: 2). Combined-SCR thus apparently benefits from the characteristics of both Cu-SCR and Fe-SCR, allowing it to reduce NOx over a wide range of operating conditions.
- Hisakazu Suzuki - National Traffic Safety and Environmental Lab.
- Hajime Ishii - National Traffic Safety and Environmental Lab.
- Kyohei Yamaguchi - National Traffic Safety and Environmental Lab.
- Hirotaka Nishiyama - Waseda University
- Yo Tanaka - Waseda University
- Taiki Adachi - Waseda University
- Syunsuke Kawamura - Waseda University
- Yasuhiro Daisho - Waseda Univ.
CitationNishiyama, H., Tanaka, Y., Adachi, T., Kawamura, S. et al., "A Study on the Improvement of NOx Reduction Efficiency for a Urea SCR System," SAE Technical Paper 2015-01-2014, 2015, https://doi.org/10.4271/2015-01-2014.
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