A Study on the Improvement of NOx Reduction Efficiency for a Urea SCR System (Eighth Report)
尿素SCR システムのNOx 浄化率向上に関する研究(第8報)
The urea SCR system is a major diesel NOx aftertreatment system. An ammonia slip catalyst (ASC) is located downstream of the SCR system to remove ammonia slipping from it, resulting in forming N₂O having a significantly high global warming potential. Thus, the authors adopted dual-layered ASCs to identify how N₂O is formed in the oxidation layer and how Zeolite layer thickness effects NH₃ to N₂O conversion characteristics. Engine tests and numerical simulations were conducted. The results show that Zeolite has a supplemental effect of reducing NOx and that an reduction in N₂O formation is possible by increasing zeolite layer thickness while NH₃ conversion is decreased. Thus, it is confirmed that zeolite layer thickness should be optimized to reduce these two emissions.ディーゼル機関のNOxを浄化する尿素SCRシステムでは,スリップしたNH₃の酸化触媒(ASC)におけるN₂Oの生成が問題とされている.そこで本研究では,Dual-layerのASCを採用し,Zeolite層の厚みがN₂Oの生成とNH₃浄化に及ぼす影響について実験と数値計算を行い,その層厚さの増加に従ってN₂Oの生成割合が減少する効果を確認した.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/02878321
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Authors:
- Adachi, Taiki
- Matsui, Wataru
- Li, Jinze
- Daisho, Yasuhiro
- Suzuki, Hisakazu
- Ishii, Hajime
- Yamaguchi, Kyohei
- Publication Date: 2014-5
Language
- English
- Japanese
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: pp 501-507
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Serial:
- Transactions of Society of Automotive Engineers of Japan
- Volume: 45
- Issue Number: 3
- Publisher: Society of Automotive Engineers of Japan
- ISSN: 0287-8321
- EISSN: 1883-0811
- Serial URL: https://www.jstage.jst.go.jp/browse/jsaeronbun
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Publication flags:
Open Access (libre)
Subject/Index Terms
- TRT Terms: Ammonia; Catalysts; Diesel engine exhaust gases; Diesel engines; Nitrogen oxides; Reduction (Chemistry); Selective catalytic reduction; Urea
- Uncontrolled Terms: Zeolite
- Subject Areas: Environment; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 01674292
- Record Type: Publication
- Source Agency: Japan Science and Technology Agency (JST)
- Files: TRIS, JSTAGE
- Created Date: Jun 29 2018 5:12PM