화학공학소재연구정보센터
Clean Technology, Vol.22, No.4, 211-224, December, 2016
암모니아를 환원제로 이용한 NOx 저감 촉매 기술
Catalytic Technology for NOx Abatement using Ammonia
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초록
가솔린 자동차의 내연기관 배기가스 처리를 위한 촉매로 삼원촉매가 널리 사용되고 있다. 반면 디젤 자동차의 배출 오염 물질 처리를 위해서는 다양한 기술들이 연구개발되고 있다. 디젤 자동차의 특징인 희박연소 조건에서 발생하는 질소산화물의 저감과 제거를 위해 티타니아에 담지된 바나듐 촉매가 상용화되어 있다. 바나듐 촉매를 이용한 질소산화물 저감기술은 암모니아를 환원제로 이용함으로써 대형 디젤 차량에 효과적으로 적용할 수 있다. 최근 활발하게 연구개발이 이루어지고 있는 구리가 이온 교환된 제올라이트 촉매는 초고연비 자동차 개발의 필수 기술로 인식되고 있다. 본 총설에서는 디젤 엔진의 배기가스 중 질소산화물을 효과적으로 제거하기 위한 후처리 기술 중 하나인 암모니아를 이용한 선택적 촉매 환원 반응의 촉매로 사용되는 구리가 이온 교환된 제올라이트 촉매와 관련한 최근 연구개발 동향을 소개하고자 한다.
Three way catalyst has been used extensively for the exhaust gas treatment for the internal combustion gasoline engine. While, numerous research efforts have been directed to develop various technologies for the abatement of exhaust gas from diesel engine. Diesel engin operating under lean condition produces large amount of NOx and the corresponding catalytic technology employing vanadium supported titania using ammonia has been commercialized for heavy duty vehicle. Recently, the Cu catalyst supported on zeolite has been investigated for NOx abatement using ammonia because of its critical importance for ultra low emission vehicle. The current review shows the recent trend in research and development for zeolite based copper catalysts, which are mainly used as catalysts for selective catalytic reduction using ammonia, are one of the aftertreatment technologies for effectively removing nitrogen oxides from diesel exhaust.
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