A Study on the Improvement of NOx Reduction Efficiency for a Urea SCR System

Hirotaka Nishiyama, Yo Tanaka, Taiki Adachi, Syunsuke Kawamura, Yasuhiro Daisho, Hisakazu Suzuki, Hajime Ishii, Kyohei Yamaguchi

研究成果: Article査読

10 被引用数 (Scopus)

抄録

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.

本文言語English
ジャーナルSAE Technical Papers
2015-September
September
DOI
出版ステータスPublished - 2015 9月 1

ASJC Scopus subject areas

  • 自動車工学
  • 安全性、リスク、信頼性、品質管理
  • 汚染
  • 産業および生産工学

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