JP5592653B2 - 低熱容量のフィルター基材上のscr - Google Patents
低熱容量のフィルター基材上のscr Download PDFInfo
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- JP5592653B2 JP5592653B2 JP2009551820A JP2009551820A JP5592653B2 JP 5592653 B2 JP5592653 B2 JP 5592653B2 JP 2009551820 A JP2009551820 A JP 2009551820A JP 2009551820 A JP2009551820 A JP 2009551820A JP 5592653 B2 JP5592653 B2 JP 5592653B2
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Images
Classifications
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
- B01J29/723—CHA-type, e.g. Chabazite, LZ-218
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D39/00—Filtering material for liquid or gaseous fluids
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/8621—Removing nitrogen compounds
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- B01D53/8628—Processes characterised by a specific catalyst
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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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
- B01D53/9404—Removing only nitrogen compounds
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- B01D53/9413—Processes characterised by a specific catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
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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
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- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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Description
4NO + 4NH3 + O2 → 4N2 + 6H2O
2NO2 + 4NH3 + O2 → 3N2 + 6H2O
NO + NO2 + NH3 → 2N2 + 3H2O
F=γρcosθ
式中、F=濡れ力;γ=液体の表面張力;ρ=液滴周囲長。
本出願は、銅CHAゼオライト触媒という名称の2007年2月27日出願の米国仮出願特許60/891,835の35U.S.C.§119(e)による優先権を主張するもので、これを本出願に組み込むものとする。
Claims (17)
- 複数の不織無機繊維を含む繊維マトリックス壁面流型フィルターと該繊維マトリックス壁面流型フィルター上のチャバザイトモレキュラーシーブSCR触媒とからなり、前記繊維マトリックス壁面流型フィルターの空隙率が50%以上70%以下であることを特徴とする選択的接触還元(SCR)フィルター。
- 前記繊維マトリックス壁面流型フィルターがハニカム構造を有する請求項1のフィルター。
- 前記繊維マトリックス壁面流型フィルターが、アルミナ繊維、シリカ繊維、ムライト繊維、炭化ケイ素繊維、アルミノケイ酸塩繊維、ホウケイ酸アルミニウム繊維、またはこれらの組み合わせのうちの少なくとも一つの繊維を含む請求項1のフィルター。
- 前記繊維マトリックス壁面流型フィルターの200から800℃での熱膨張率が1×10-6/℃以上6×10-6/℃以下である請求項1のフィルター。
- 前記チャバザイトモレキュラーシーブSCR触媒が疎水性チャバザイトモレキュラーシーブを含む請求項1のフィルター。
- 前記チャバザイトモレキュラーシーブSCR触媒が金属交換チャバザイトモレキュラーシーブを含む請求項1のフィルター。
- 前記チャバザイトモレキュラーシーブSCR触媒が、Cu交換チャバザイトモレキュラーシーブ、Fe交換チャバザイトモレキュラーシーブまたはこれらの組合せを含む請求項1のフィルター。
- アンモニアまたはアンモニア前駆体を排気流中に注入する注入装置と注入装置と連通しその下流にあるSCRフィルターとを含み、該SCRフィルターが、繊維マトリックス壁面流型フィルターと該繊維マトリックス壁面流型フィルター上のチャバザイトモレキュラーシーブSCR触媒を有し、該繊維マトリックス壁面流型フィルターが複数の不織無機繊維を含み、前記繊維マトリックス壁面流型フィルターの空隙率が50%以上70%以下であることを特徴とするNOxと粒子状物質を含む排気流を処理するための排気処理システム。
- 前記繊維マトリックス壁面流型フィルターが、アルミナ繊維、シリカ繊維、ムライト繊維、炭化ケイ素繊維、アルミノケイ酸塩繊維、ホウケイ酸アルミニウム繊維、またはこれらの組み合わせのうちの少なくとも一つの繊維を含む請求項8の排出物処理システム。
- 前記繊維マトリックス壁面流型フィルターの200から800℃での熱膨張率が1×10-6/℃以上6×10-6/℃以下である請求項8の排出物処理システム。
- 前記チャバザイトモレキュラーシーブSCR触媒が疎水性チャバザイトモレキュラーシーブを含む請求項8の排出物処理システム。
- 前記チャバザイトモレキュラーシーブSCR触媒が金属交換チャバザイトモレキュラーシーブを含む請求項8の排出物処理システム。
- 前記チャバザイトモレキュラーシーブSCR触媒が、Cu交換チャバザイトモレキュラーシーブ、Fe交換チャバザイトモレキュラーシーブまたはこれらの組合せを含む請求項8の排出物処理システム。
- アンモニアまたはアンモニア前駆体をディーゼルエンジン排気中に注入する工程、該排気を繊維マトリックス壁面流型フィルターと該繊維マトリックス壁面流型フィルター上のチャバザイトモレキュラーシーブSCR触媒を有するSCRフィルターに通す工程を含み、該繊維マトリックス壁面流型フィルターが複数の不織無機繊維を含み、前記繊維マトリックス壁面流型フィルターの空隙率が50%以上70%以下であることを特徴とするディーゼルエンジン排気中のNOxと粒子状物質を低減する方法。
- さらに、アンモニアまたはアンモニア前駆体を排気中に注入する前に、上記の排気を酸化触媒に通す請求項14の方法。
- 前記繊維マトリックス壁面流型フィルターが、アルミナ繊維、シリカ繊維、ムライト繊維、炭化ケイ素繊維、アルミノケイ酸塩繊維、ホウケイ酸アルミニウム繊維、またはこれらの組み合わせのうちの少なくとも一つの繊維を含む請求項14の方法。
- 前記繊維マトリックス壁面流型フィルターの200から800℃での熱膨張率が1×10-6/℃以上6×10-6/℃以下である請求項14の方法。
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