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NH₃-SCR 촉매를 이용한 디젤기관에서의 NOx 저감에 관한 연구
박경균(Kyounggyun Park),이원석(Wonseok Lee),이성욱(Seongwock Lee),강호인(Hoin Kang),나완용(Wanyong Rha),손용기(Yonggy Son),임인혁(Inhyuk Im),황재원(Jaewon Hwang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel engines provide merits in the aspect of higher thermal efficiency and less CO₂ emission, but more problems on PM and NOx emissions. Selective Catalyst Reduction(SCR) technology is well-known to be effective for the reduction of NOx emission. SCR system can be classified into three kinds of NSR, NH₃-SCR and HC-SCR depending on reducing agents in jet spray. Because of poisoning problem of sulfur and unstable gas condition, much stable Urea-SCR system has been preferred to use instead. However, this research used to NH₃ gas instead Urea solution to model gas test. It is general to use NH₃-SCR catalyst for the NOx reduction on a diesel engine. This research focuses on the effects of gas temperature, SV(space velocity) and AR(aspect ratio) of NOx reduction rate. In this experiment was used the model gas which is similar to a diesel exhaust gas. NOx conversion rate is higher than 90% at the temperature of near 400℃ for all cases. As SV is lower, NOx conversion rate is decreased. On the contrary, as AR is higher, NOx conversion rate is increased.