JP5826285B2 - NOx吸収触媒 - Google Patents
NOx吸収触媒 Download PDFInfo
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Description
NO+1/2O2→NO2 (1);及び
BaO+NO2+1/2O2→Ba(NO3)2 (2)であり、
反応式(1)では、一酸化窒素は白金の活性酸化部位と反応してNO2を生成する。反応式(2)では、NO2が貯蔵物質により無機硝酸塩として吸着される。
Ba(NO3)2→BaO+2NO+3/2O2 又はBa(NO3)2→BaO+2NO2+1/2O2(3);及び
NO+CO→1/2N2+CO2 (4);
(他の反応式として、Ba(NO3)2+8H2→BaO+2NH3+5H2O、次いでNH3+NOx→N2+yH2O又は2NH3+2O2+CO→N2+3H2O+CO2などが挙げられる)。
比較基体1A:1平方インチあたりのセル数(cpsi)400個のフロースルーコージェライト基体モノリスを(1)94g/ft3のPt及び19g/ft3のPd、2g/in3のセリウム分散アルミナ、1g/in3の粒子状セリア及び400g/ft3のBa;及び(2)希土類元素でドープされた0.5g/in3 85wt.%のジルコニアに支持された10g/ft3のRhを含むNOx吸収触媒の配合物でコートする。NOx吸収触媒を国際出願第99/47260号に開示の方法を用いて新しい基体モノリスにコートし、次いで100℃で30分強制空気乾燥した後500℃で2時間焼成する。
Claims (11)
- 複数のウォッシュコート層でコートされ、耐熱支持物質に支持された窒素酸化物貯蔵成分、少なくとも1つの貴金属及び分散した希土類酸化物を含む第1成分と、窒素酸化物貯蔵物質を有さないバルクの還元可能な酸化物に支持された貴金属を含む第2成分とを含む基体モノリスを有するNOx吸収触媒であって、第2成分中に存在する貴金属はPt、Pd又はPtとPd両方の組合せを含み、バルクの還元可能な酸化物はマンガン、鉄、コバルト、銅、すず又はセリウムのうち少なくとも1つを含む酸化物、複合酸化物又は混合酸化物であり、下層が前記第1成分を含み、前記下層を覆う層が耐熱支持物質に支持されたロジウムを含む第3成分を含み、及び、モレキュラーシーブを含む層が前記下層と前記第3成分を含む層の間に配置されるか又はモレキュラーシーブを含む層が前記第3成分を含む層を覆う、NOx吸収触媒。
- 第2成分が第1成分を含む前記下層とは別の層にある、請求項1に記載のNOx吸収触媒。
- 第1成分を含む前記下層が、バルクの還元可能な酸化物に支持された貴金属を含む第4成分を含み、第2成分中に存在する貴金属が、Pt、Pd又はPtとPd両方の組合せを含む、請求項2に記載のNOx吸収触媒。
- ドープされるバルクの還元可能な酸化物の総重量に基づき、0.5から80wt%のジルコニウム、ケイ素、スカンジウム、イットリウム、ランタン及び希土類金属又はこれらの混合物からなる群より選択される元素の少なくとも1つの酸化物がバルクの還元可能な酸化物にドープされる、請求項1に記載のNOx吸収触媒。
- 第1成分中の耐熱支持物質が、アルミナ、マグネシア、非晶質シリカ−アルミナ、チタニア、ジルコニア、モレキュラーシーブ又はこれらの任意の2つ以上の混合物、複合酸化物又は混合酸化物である、請求項1に記載のNOx吸収触媒。
- 耐熱支持体が均質なアルミン酸マグネシウムである、請求項5に記載のNOx吸収触媒。
- 第1成分中の分散した希土類酸化物が、セリウム、プラセオジム、ネオジウム、ランタン、サマリウム及びこれらの混合物からなる群より選択される元素の酸化物を含む、請求項1に記載のNOx吸収触媒。
- 窒素酸化物貯蔵成分が、アルカリ土類金属、アルカリ金属、希土類金属及びこれらの任意の2つ以上の組合せからなる群より選択される、請求項1に記載のNOx吸収触媒。
- モレキュラーシーブが、シリコアルミノホスフェート(SAPO)又はアルミノケイ酸塩ゼオライトである、請求項1に記載のNOx吸収触媒。
- 外層が第2成分を含む、請求項1に記載のNOx吸収触媒。
- リーンバーン内燃エンジンからの排気ガスを処理する方法であって、該方法が、一酸化窒素を含むリーン排気ガスを請求項1のNOx吸収触媒と接触させるステップと、NOx吸収触媒を濃縮された排気ガスと断続的に接触させるステップを有する、方法。
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Application Number | Priority Date | Filing Date | Title |
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GB1021649.7 | 2010-12-21 | ||
GBGB1021649.7A GB201021649D0 (en) | 2010-12-21 | 2010-12-21 | NOx Absorber catalyst |
PCT/GB2011/052539 WO2012085564A1 (en) | 2010-12-21 | 2011-12-21 | NOx ABSORBER CATALYST |
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JP2014501613A JP2014501613A (ja) | 2014-01-23 |
JP2014501613A5 JP2014501613A5 (ja) | 2015-02-19 |
JP5826285B2 true JP5826285B2 (ja) | 2015-12-02 |
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JP2013545498A Active JP5826285B2 (ja) | 2010-12-21 | 2011-12-21 | NOx吸収触媒 |
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US (1) | US9114385B2 (ja) |
EP (1) | EP2665545A1 (ja) |
JP (1) | JP5826285B2 (ja) |
KR (1) | KR101953402B1 (ja) |
GB (1) | GB201021649D0 (ja) |
WO (1) | WO2012085564A1 (ja) |
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US9662638B2 (en) | 2013-01-08 | 2017-05-30 | Umicore Ag & Co. Kg | Catalyst for reducing nitrogen oxides |
EP2769760A1 (de) * | 2013-02-21 | 2014-08-27 | Umicore AG & Co. KG | Katalysator zur Reduktion von Stickoxiden |
WO2015005342A1 (ja) * | 2013-07-08 | 2015-01-15 | ユミコア日本触媒株式会社 | 窒素酸化物除去用触媒 |
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JP2014501613A (ja) | 2014-01-23 |
KR20140015295A (ko) | 2014-02-06 |
GB201021649D0 (en) | 2011-02-02 |
US20130336865A1 (en) | 2013-12-19 |
WO2012085564A1 (en) | 2012-06-28 |
KR101953402B1 (ko) | 2019-02-28 |
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