KR101974704B1 - 선택적 암모니아 산화를 위한 이원기능 촉매 - Google Patents
선택적 암모니아 산화를 위한 이원기능 촉매 Download PDFInfo
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Abstract
Description
도 2는 두 가지 촉매에 대한 정상상태 NH3 산화 프로필을 보여준다: 속이 채워진 기호 = 0.57% Pt/Al2O3, 촉매 담지량 0.5 g/in3, Pt 담지량 5 g/ft3; 속이 빈 기호 = 0.57% Pt/Al2O3, 촉매 담지량 0.5 g/in3, Pt 담지량 5 g/ft3 + 2.5 g/in3 철-교환 베타 제올라이트 (Fe = Fe2O3로 측정하여 1.1%, SAR = 30). NH3 = 500 ppm, NO = 0, O2 = 10% (대기로서), H2O = 5%, 나머지 = N2, GHSV = 100,000/hr. 실선은 데이터 점들 간의 선형 보간이다.
도 3은 일시적 NH3 산화 평가를 위한 펄스 램프 NH3 라이트오프 (lightoff) 실험에 대한 NH3 유입구 농도 프로필 및 반응기 온도 프로필을 보여준다. 가스 조성: O2 = 10%, H2O = 5%, CO2 = 5%, 나머지 = N2, GHSV = 100,000/hr.
도 4는 펄스 램프 라이트오프 시험으로 평가한 대표적인 이원기능 암모니아 산화 촉매에 대한 순간 배출물 프로필을 보여준다. 촉매 = 1.8 중량% Pt/Al2O3, 1.0 g/in3, Pt 담지량 = 30 g/ft3 + 0.5 g/in3 베타 제올라이트.
도 5는 펄스 램프 라이트오프 시험으로 평가한 대표적인 이원기능 암모니아 산화 촉매에 대한 순간 배출물 프로필을 보여준다. 촉매 = 1.8 중량% Pt/Al2O3, 1.0 g/in3, Pt 담지량 = 30 g/ft3 + 0.5 g/in3 베타 제올라이트.
도 6은 펄스 램프 라이트오프 시험으로 평가한, 촉매 내에 상이한 수준의 철-교환된 베타 제올라이트를 갖는 일련의 이원기능 암모니아 산화 촉매의 NOx (= NO + NO2)에 대한 선택성을 보여준다. 실선은 데이터에 대한 선형 최소자승선이다.
도 7은 일련의 이원기능 암모니아 산화 촉매에 대하여 펄스 램프 라이트오프 시험으로 평가한, 암모니아의 부분 전환율을 촉매 내 철-교환 베타 제올라이트 양의 함수로서 보여준다. 실선은 데이터에 대한 선형 최소자승선이다.
도 8은 두 가지 촉매에 대한 정상상태 NH3 산화 프로필을 보여준다: 속이 채워진 기호 = 0.57% Pt/Al2O3, 촉매 담지량 0.5 g/in3, Pt 담지량 5 g/ft3; 속이 빈 기호 = 0.57% Pt/Al2O3, 촉매 담지량 0.5 g/in3, Pt 담지량 5 g/ft3 + 구리-교환 차바자이트, 촉매 담지량 = 2.5 g/in3 (구리 = CuO로 측정하여 2.5%, SAR = 30). NH3 = 500 ppm, NO = 0, O2 = 10% (대기로서), H2O = 5%, 나머지 = N2, GHSV = 100,000/hr. 실선은 데이터 점들 간의 선형 보간이다.
Claims (25)
- 차량의 엔진 배기 스트림을 적어도 하나의 NOx 저감 촉매 조성물에 통과시키는 단계; 및
NOx 저감 촉매 조성물에서 나오는 배기 스트림을 암모니아를 산화시키는 데 효과적인 이원기능 산화 촉매 조성물에 통과시키는 단계
를 포함하며, 상기 이원기능 산화 촉매 조성물은 암모니아 산화 촉진용 제1의 촉매와 N2 선택성 향상용 제2의 촉매를 포함하고,
상기 제1의 촉매는 알루미나, 실리카, 지르코니아, 티타니아, 세리아 및, 이들의 물리적 혼합물 또는 화학적 조합물 또는 원자 도핑된 조합물로부터 선택되는 내화성 금속 산화물 상에 지지된 백금으로 구성되고, 상기 제2의 촉매는 구리가 지지된 차바자이트(chabazite) (CuCHA)인 것인,
디젤 또는 린번 차량의 배기 가스 스트림 중에 생성되는 배출물을 처리하는 방법. - 제1항에 있어서, NOx 저감 촉매 조성물이 SCR 촉매 또는 LNT 촉매를 포함하는 것인 방법.
- 제1항에 있어서, NOx 저감 촉매 조성물과 산화 촉매 조성물이 별개의 기재 상에 부착되는 것인 방법.
- 제1항에 있어서, NOx 저감 촉매 조성물과 산화 촉매가 동일한 기재 상에 부착되는 것인 방법.
- 제1항에 있어서, 내화성 금속 산화물이 알루미나인 것인 방법.
- 제1항에 있어서, 백금이 전체 촉매 부피를 기준으로 0.1 g/ft3 내지 10 g/ft3 범위 내의 양으로 존재하는 것인 방법.
- 제1항에 있어서, CuCHA의 구리가 차바자이트 상에 차바자이트 중량의 0.1% 내지 5%의 양으로 존재하는 것인 방법.
- 제1항에 있어서, 내화성 금속 산화물 지지체의 총 담지량이 전체 촉매 부피를 기준으로 0.01 g/in3 내지 2.0 g/in3인 방법.
- 제1항에 있어서, 차바자이트 내에서 실리카 대 알루미나의 몰비가 2 내지 250인 방법.
- 제1항에 있어서, 기재 상 차바자이트의 총 담지량이 전체 촉매 부피를 기준으로 0.1 g/in3 내지 4.0 g/in3인 방법.
- 알루미나, 실리카, 지르코니아, 티타니아, 세리아 및, 이들의 물리적 혼합물 또는 화학적 조합물 또는 원자 도핑된 조합물로부터 선택되는 내화성 금속 산화물 상에 지지된 백금으로 구성되는 것인, 암모니아 산화 촉진용 제1의 촉매; 및
구리가 지지된 차바자이트 (CuCHA)인, N2 선택성 향상용 제2의 촉매
를 포함하는, 암모니아를 산화시키는 데 효과적인 이원기능 촉매 조성물. - 제11항에 있어서, 내화성 금속 산화물이 알루미나인 것인 이원기능 촉매 조성물.
- 제11항에 있어서, 백금이 전체 촉매 부피를 기준으로 0.1 g/ft3 내지 10 g/ft3 범위 내의 양으로 존재하는 것인 이원기능 촉매 조성물.
- 제11항에 있어서, CuCHA의 구리가 차바자이트 상에 차바자이트 중량의 0.1% 내지 5%의 양으로 존재하는 것인 이원기능 촉매 조성물.
- 제11항에 있어서, 내화성 금속 산화물 지지체의 총 담지량이 전체 촉매 부피를 기준으로 0.01 g/in3 내지 2.0 g/in3인 이원기능 촉매 조성물.
- 제11항에 있어서, 차바자이트 내 실리카 대 알루미나의 몰비가 4 내지 250인 이원기능 촉매 조성물.
- 제11항에 있어서, 기재 상 차바자이트의 총 담지량이 전체 촉매 부피를 기준으로 0.1 g/in3 내지 4.0 g/in3인 이원기능 촉매 조성물.
- NOx를 감소시키는 데 효과적인 하나 이상의 상류 NOx 저감 촉매 조성물; 및
암모니아를 제거하는 데 효과적인 하류 이원기능 산화 촉매 조성물
을 포함하며, 상기 이원기능 산화 촉매 조성물은 암모니아 산화 촉진용 제1의 촉매와 N2 선택성 향상용 제2의 촉매를 포함하고,
상기 제1의 촉매는 알루미나, 실리카, 지르코니아, 티타니아, 세리아 및, 이들의 물리적 혼합물 또는 화학적 조합물 또는 원자 도핑된 조합물로부터 선택되는 내화성 금속 산화물 상에 지지된 백금으로 구성되고, 상기 제2의 촉매는 구리가 지지된 차바자이트 (CuCHA)인 것인,
NOx를 함유한 배기 스트림을 위한 처리 시스템. - 제18항에 있어서, NOx 저감 촉매 조성물이 SCR 촉매 또는 LNT 촉매를 포함하는 것인 처리 시스템.
- 제18항에 있어서, NOx 저감 촉매 조성물과 이원기능 산화 촉매 조성물이 별개의 기재 상에 부착되는 것인 처리 시스템.
- 제18항에 있어서, NOx 저감 촉매 조성물과 이원기능 산화 촉매 조성물이 동일한 기재 상에 부착되는 것인 처리 시스템.
- 제18항에 있어서, 배기 스트림 중으로 암모니아 또는 암모니아 전구체를 계량 투입하는 계량 시스템을 포함하는 처리 시스템.
- 제1항에 있어서, 이원기능 산화 촉매 조성물이 250℃ 내지 400℃에서 60%를 넘는 N2 선택성을 보이는 것인 방법.
- 제11항에 있어서, 250℃ 내지 400℃에서 60%를 넘는 N2 선택성을 보이는 이원기능 촉매 조성물.
- 제18항에 있어서, 이원기능 산화 촉매 조성물이 250℃ 내지 400℃에서 60%를 넘는 N2 선택성을 보이는 것인 처리 시스템.
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CN101711185A (zh) | 2010-05-19 |
PL2117702T3 (pl) | 2021-05-04 |
CA2679599C (en) | 2016-01-05 |
CN105251359A (zh) | 2016-01-20 |
JP2010519039A (ja) | 2010-06-03 |
KR20160079935A (ko) | 2016-07-06 |
MX2009009097A (es) | 2009-09-18 |
EP2117702A2 (en) | 2009-11-18 |
US20080292519A1 (en) | 2008-11-27 |
JP6125552B2 (ja) | 2017-05-10 |
MY151931A (en) | 2014-07-31 |
RU2009135861A (ru) | 2011-04-10 |
WO2008106523A3 (en) | 2008-12-04 |
JP5761917B2 (ja) | 2015-08-12 |
BRPI0807379A2 (pt) | 2014-05-06 |
US7722845B2 (en) | 2010-05-25 |
KR20170089936A (ko) | 2017-08-04 |
BRPI0807379B1 (pt) | 2017-12-26 |
CA2679599A1 (en) | 2008-09-04 |
JP2015166083A (ja) | 2015-09-24 |
EP3778009A1 (en) | 2021-02-17 |
KR20090114480A (ko) | 2009-11-03 |
WO2008106523A2 (en) | 2008-09-04 |
KR20150065907A (ko) | 2015-06-15 |
EP2117702B1 (en) | 2020-11-11 |
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