KR20180055553A - 배기가스 정화장치 - Google Patents
배기가스 정화장치 Download PDFInfo
- Publication number
- KR20180055553A KR20180055553A KR1020160153507A KR20160153507A KR20180055553A KR 20180055553 A KR20180055553 A KR 20180055553A KR 1020160153507 A KR1020160153507 A KR 1020160153507A KR 20160153507 A KR20160153507 A KR 20160153507A KR 20180055553 A KR20180055553 A KR 20180055553A
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- KR
- South Korea
- Prior art keywords
- exhaust gas
- catalyst
- diesel oxidation
- particulate matter
- lta zeolite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
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- F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
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- F01N2610/00—Adding substances to exhaust gases
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Abstract
Description
도 2는 배기 온도에 따른 NOx 정화 효율을 도시한 그래프이다.
도 3은 본 발명의 실시예에 따라 SCR 작동 여부에 따른 누적 NOx량을 도시한 그래프이다.
도 4는 본 발명의 제2 실시예에 따른 배기가스 정화장치의 구조를 간략히 도시한 도면이다.
도 5는 본 발명의 제3 실시예에 따른 배기가스 정화장치의 구조를 간략히 도시한 도면이다.
도 6은 본 발명의 각 실시예에 따른 PM 재생시 DOC 촉매 온도를 도시한 그래프이다.
Claims (14)
- 엔진의 배기가스를 정화시키도록 구비되는 배기가스 정화장치에 있어서,
상기 엔진에서 배출되는 배기가스가 통과하는 배기라인,
상기 배기라인에 설치되어 배기가스 중 탄화수소(HC)와 일산화탄소(CO)를 정화시키는 디젤산화촉매(Diesel Oxidation Catalyst; DOC),
상기 배기라인 내부에 우레아 수용액을 분사하는 우레아 인젝터(Urea Injector), 그리고
상기 우레아 수용액을 이용하여 상기 디젤산화촉매를 통과한 배기가스의 질소산화물을 저감시키는 선택적환원촉매(Selective Catalyst Reduction; SCR)
를 포함하며,
상기 디젤산화촉매는,
LTA 제올라이트 촉매를 포함하는 배기가스 정화장치. - 제1항에 있어서,
상기 LTA 제올라이트 촉매는,
Pt, Pd, Rh, Fe, Cu, Ag, Mn, Co, 및 Mg 중 적어도 하나를 포함하는 배기가스 정화장치. - 제2항에 있어서,
상기 LTA 제올라이트 촉매가 상기 Pd를 포함하는 경우,
상기 LTA 제올라이트 촉매 전체 중량에 대한 Pd의 함량은 0.1 중량% 내지 3 중량%인 배기가스 정화장치. - 제1항 내지 제3항 중 어느 한 항에 있어서,
상기 디젤산화촉매의 후단에 형성되거나 상기 선택적환원촉매의 전단에 형성되며, 상기 배기가스의 입자상물질을 저감시키는 입자상물질 제거용 필터(Diesel Particulate matter Filter; DPF)를 더 포함하는 배기가스 정화장치. - 제4항에 있어서,
상기 입자상물질 제거용 필터에 일정량의 입자상물질이 포집되면 상기 입자상물질 제거용 필터의 전단의 온도가 일정온도 이상이 되도록 제어하는 배기가스 정화장치. - 제3항에 있어서,
상기 디젤산화촉매는,
상기 선택적환원촉매의 미작동 영역에서 상기 배기가스 중의 NOx를 저장하고, 상기 선택적환원촉매가 활성화된 후에 저장된 상기 NOx를 탈착시키는 배기가스 정화장치. - 제6항에 있어서,
상기 선택적환원촉매의 미작동 영역의 온도는 상기 선택적환원촉매가 활성화된 후의 온도보다 낮은 배기가스 정화장치. - 제3항에 있어서,
상기 디젤산화촉매는,
상기 배기가스에 산소가 많은 조건(Lean condition)에서 발생하는 NOx를 저장하는 배기가스 정화장치. - 엔진의 배기가스를 정화시키도록 구비되는 배기가스 정화장치에 있어서,
상기 엔진에서 배출되는 배기가스가 통과하는 배기라인 상에 설치되며, 디젤산화촉매(Diesel Oxidation Catalyst; DOC)를 포함하는 전단 촉매부, 그리고
상기 전단 촉매부와 연결되며, 선택적환원촉매(Selective Catalyst Reduction; SCR)를 포함하는 후단 촉매부
를 포함하며,
상기 디젤산화촉매는,
LTA 제올라이트 촉매를 포함하는 배기가스 정화장치. - 제9항에 있어서,
상기 전단 촉매부 또는 후단 촉매부는,
상기 배기가스의 입자상물질을 저감시키는 입자상물질 제거용 필터(Diesel Particulate matter Filter; DPF)를 포함하는 배기가스 정화장치. - 제10항에 있어서,
상기 배기라인 내부에 우레아 수용액을 분사하는 우레아 인젝터(Urea Injector), 그리고
상기 우레아 수용액의 분사를 제어하며, 상기 입자상물질 제거용 필터에 일정량의 입자상물질이 포집되면 상기 배기가스의 온도가 일정온도 이상이 되도록 제어하는 제어부
를 더 포함하는 배기가스 정화장치. - 제9항에 있어서,
상기 디젤산화촉매는,
상기 선택적환원촉매의 미작동 영역에서 상기 배기가스 중의 NOx를 저장하고, 상기 선택적환원촉매가 활성화된 후에 상기 디젤산화촉매에 저장된 NOx를 탈착시키는 배기가스 정화장치. - 제9항에 있어서,
상기 LTA 제올라이트 촉매는,
Pt, Pd, Rh, Fe, Cu, Ag, Mn, Co, 및 Mg 중 적어도 하나를 포함하는 배기가스 정화장치. - 제13항에 있어서,
상기 LTA 제올라이트 촉매가 상기 Pd를 포함하는 경우,
상기 LTA 제올라이트 촉매 전체 중량에 대한 Pd의 함량은 0.1 중량% 내지 3 중량%인 배기가스 정화장치.
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US15/799,794 US10413868B2 (en) | 2016-11-17 | 2017-10-31 | Devices for purifying exhaust gas |
EP17201583.6A EP3324013A1 (en) | 2016-11-17 | 2017-11-14 | Device for purifying exhaust gas |
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KR20140002772A (ko) * | 2011-04-08 | 2014-01-08 | 도요타 지도샤(주) | 배기 가스 정화용 산화 촉매 |
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DE102008018519A1 (de) | 2008-04-12 | 2009-10-15 | Man Nutzfahrzeuge Ag | Schwefelresistentes Abgasnachbehandlungssystem zur Oxidation von NO |
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KR20150090176A (ko) | 2012-11-29 | 2015-08-05 | 바스프 에스이 | 팔라듐, 금 및 세리아를 포함하는 디젤 산화 촉매 |
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US9616384B2 (en) * | 2014-06-11 | 2017-04-11 | Basf Se | Base metal catalyst |
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