Improvement of De-NOx Performance of a SCR System by Dual-Point Ammonia Injection in a Diesel Engine

• Published in: International journal of automotive technology Vol. 25; no. 6; pp. 1263 - 1271
• Main Authors: Raza, Hassan, Kim, Yanghwa, Lim, Ocktaeck, Oh, Kwang-Chul, Kim, Hongsuk
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Society of Automotive Engineers 01.12.2024; Springer Nature B.V; 한국자동차공학회
• Subjects: Ammonia; Automobiles; Automotive Engineering; Catalysts; Chemical reduction; Cold; Diesel engines; Efficiency; Emissions; Engine and Emissions; Engineering; Engines; Fuels and Lubricants; Mechanical engineering; Nitrogen oxides; Pollutants; Selective catalytic reduction; Spatial distribution; Zeolites; 자동차공학; Close coupled SCR; NOx; Selective catalytic reaction; Dual-point ammonia injection; Cu–zeolite catalyst
• ISSN: 1229-9138; 1976-3832
• DOI: 10.1007/s12239-024-00115-6

Selective catalytic reduction (SCR) catalysts is used widely to reduce NOx emissions from diesel engines. However, improvements in de-NOx performance are required to meet future standards of near-zero NOx emissions. This study examines the effectiveness of dual-point NH 3 injection technology, in which gaseous NH 3 is injected into both closed coupled and under floor SCR catalysts. The NOx removal efficiency of dual-point NH 3 injection is compared with that of single-point injection in a World Harmonized Transient Cycle test. The results show that dual-point injection of NH 3 gas can effectively reduce NOx emissions from diesel engines due to superior temporal and spatial distribution of NH 3 gas in an SCR catalyst.