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．

• Record URL:
  https://doi.org/10.11351/jsaeronbun.45.501
• Record URL:
  http://scholar.google.com/scholar_lookup?title=A%20Study%20on%20the%20Improvement%20of%20NOx%20Reduction%20Efficiency%20for%20a%20Urea%20SCR%20System%20(Eighth%20Report)&author=T.%20Adachi&author=W.%20Matsui&author=J.%20Li&author=Y.%20Daisho&author=H.%20Suzuki&author=H.%20Ishii&author=K.%20Yamaguchi&publication_year=2014
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02878321
• 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
• 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
• 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