| Improvement of De-NOx Performance of a SCR System by Dual-Point Ammonia Injection in a Diesel Engine
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| Hassan Raza 1, Yanghwa Kim 2, Ocktaeck Lim 3, Kwang-Chul Oh 4, Hongsuk Kim 1 |
1Department of Mobility Power Research, Korea Institute of Machinery & Materials
2Graduate School of Mechanical Engineering , University of Ulsan
3School of Mechanical Engineering , University of Ulsan
4Advanced Powertrain R&D Center , Korea Automotive Technology Institute |
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| ABSTRACT |
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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 NH3injection technology, in which gaseous NH3is injected into both closed coupled and under floor SCR catalysts. The NOx removal efficiency of dual-point NH3injection is compared with that of single-point injection in a World Harmonized Transient Cycle test. The results show that dual-point injection of NH3gas can effectively reduce NOx emissions from diesel engines due to superior temporal and spatial distribution of NH3gas in an SCR catalyst.
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| Key Words:
Selective catalytic reaction, Dual-point ammonia injection, Close coupled SCR, NOx, Cu–zeolite catalyst, Automotive Engineering
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Corresponding Author.
Hongsuk Kim , Email. 
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