This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Study on the Improvement of NOx Reduction Efficiency for a Urea SCR System
Technical Paper
2015-01-2014
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
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.
Authors
- Hirotaka Nishiyama - Waseda University
- Yo Tanaka - Waseda University
- Taiki Adachi - Waseda University
- Syunsuke Kawamura - Waseda University
- Yasuhiro Daisho - Waseda Univ.
- Hisakazu Suzuki - National Traffic Safety and Environmental Lab.
- Hajime Ishii - National Traffic Safety and Environmental Lab.
- Kyohei Yamaguchi - National Traffic Safety and Environmental Lab.
Citation
Nishiyama, 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.Also In
References
- Ito Soichiro et al. A study on the Improvement of NOx Reduction Efficiency for a Urea SCR System (Report seventh) Transactions of Society of Automotive Engineers of Japan 44 2 351 356 2013
- Girard , J. , Cavataio , G. , Snow , R. , and Lambert , C. Combined Fe-Cu SCR Systems with Optimized Ammonia to NOx Ratio for Diesel NOx Control SAE Int. J. Fuels Lubr 1 1 603 610 2009 10.4271/2008-01-1185
- Nishiyama Hirotaka et al. A Study on the Effects of Catalytic Metals for a Urea SCR System on NOx Reduction Performance 2013 2014 JSAE KANTO International Conference of Automotive Technology for Young Engineers (ICATYE) Proceedings C 1 3
- Balakotaiah Vemuri et al. Selective catalytic reduction of NOx on combined Fe- and Cu-zeolite monolithic catalysts Sequential and dual layer configurations Applied Catalysis B: Environmental 111 112 2012 67 80
- Tronconi E. et al. Catalytic Mechanism, Detailed Kinetics and Converter Model for NH 3 -SCR of NOx Emissions from Vehicles CLEERS 2007
- Hou , X. , Epling , W. , Schmieg , S. , and Li , W. Cu-Zeolite SCR Catalyst Thermal Deactivation Studied with FTIR Spatial Resolution SAE Int. J. Engines 4 1 1298 1318 2011 10.4271/2011-01-1138
- Adachi Taiki et al. A study on the Improvement of NOx Reduction Efficiency for a Urea SCR System (Report eighth) Transactions of Society of Automotive Engineers of Japan 45 3 501 507 2014
- COMMISSION REGULATION (EU) No 582/2011 25 May 2011 http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32011R0582&from=EN 26 Dec 2014