WO2003033119A1 - Method for catalytic reduction of nitrogen oxides and catalyst for use therein - Google Patents

Method for catalytic reduction of nitrogen oxides and catalyst for use therein Download PDF

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Publication number
WO2003033119A1
WO2003033119A1 PCT/JP2002/010500 JP0210500W WO03033119A1 WO 2003033119 A1 WO2003033119 A1 WO 2003033119A1 JP 0210500 W JP0210500 W JP 0210500W WO 03033119 A1 WO03033119 A1 WO 03033119A1
Authority
WO
WIPO (PCT)
Prior art keywords
catalyst
catalyst component
nitrogen oxides
catalytic reduction
oxides
Prior art date
Application number
PCT/JP2002/010500
Other languages
French (fr)
Japanese (ja)
Inventor
Tadao Nakatsuji
Original Assignee
Valtion Teknillinen Tutkimuskeskus
Isuzu Motors Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valtion Teknillinen Tutkimuskeskus, Isuzu Motors Limited filed Critical Valtion Teknillinen Tutkimuskeskus
Publication of WO2003033119A1 publication Critical patent/WO2003033119A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • 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
    • B01D53/9409—Nitrogen oxides
    • B01D53/9413—Processes characterised by a specific catalyst
    • B01D53/9422—Processes characterised by a specific catalyst for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
    • B01J23/63—Platinum group metals with rare earths or actinides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/024—Multiple impregnation or coating
    • B01J37/0244—Coatings comprising several layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1021—Platinum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1023—Palladium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1025—Rhodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/206—Rare earth metals

Abstract

A method for catalytic reduction of nitrogen oxides, wherein a fuel is fed under a periodic rich/lean condition and burned, and an exhaust gas generated is contacted with a catalyst structure to catalytically reduce nitrogen oxides in the exhaust gas, characterized in that the catalyst structure comprises an inert substrate and, formed thereon, (A) a surface catalyst layer having a surface catalyst component such as ceria, (B) an intermediate catalyst layer having an intermediate catalyst component comprising a first catalyst component such as ceria and a second catalyst component comprising at least one selected from among rhodium, palladium and oxides thereof, and (C) an inner catalyst layer having an inner catalyst component comprising a carrier and at least one catalyst component selected from platinum, rhodium, palladium and oxides thereof.
PCT/JP2002/010500 2001-10-15 2002-10-10 Method for catalytic reduction of nitrogen oxides and catalyst for use therein WO2003033119A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001316344A JP3721112B2 (en) 2001-10-15 2001-10-15 Method for catalytic reduction of nitrogen oxides and catalyst therefor
JP2001-316344 2001-10-15

Publications (1)

Publication Number Publication Date
WO2003033119A1 true WO2003033119A1 (en) 2003-04-24

Family

ID=19134370

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/010500 WO2003033119A1 (en) 2001-10-15 2002-10-10 Method for catalytic reduction of nitrogen oxides and catalyst for use therein

Country Status (2)

Country Link
JP (1) JP3721112B2 (en)
WO (1) WO2003033119A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1911517A1 (en) * 2005-08-01 2008-04-16 Cataler Corporation Exhaust gas purifying catalyst
EP2047904A4 (en) * 2006-07-25 2009-09-02 Toyota Motor Co Ltd Catalyst for exhaust gas purification

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4513453B2 (en) * 2004-08-02 2010-07-28 マツダ株式会社 Exhaust gas purification catalyst

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01199646A (en) * 1987-10-21 1989-08-11 Soc Fr Prod Catalyse (Procatalyse) Catalyst for treating exhaust gas of internal combustion engine and its production
JPH06262088A (en) * 1993-03-11 1994-09-20 Nissan Motor Co Ltd Catalyst for exhaust gas purification
WO1995035152A1 (en) * 1994-06-17 1995-12-28 Engelhard Corporation Layered catalyst composite
JPH08141405A (en) * 1994-11-18 1996-06-04 Mazda Motor Corp Catalyst for purification of exhaust gas from internal-combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01199646A (en) * 1987-10-21 1989-08-11 Soc Fr Prod Catalyse (Procatalyse) Catalyst for treating exhaust gas of internal combustion engine and its production
JPH06262088A (en) * 1993-03-11 1994-09-20 Nissan Motor Co Ltd Catalyst for exhaust gas purification
WO1995035152A1 (en) * 1994-06-17 1995-12-28 Engelhard Corporation Layered catalyst composite
JPH08141405A (en) * 1994-11-18 1996-06-04 Mazda Motor Corp Catalyst for purification of exhaust gas from internal-combustion engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1911517A1 (en) * 2005-08-01 2008-04-16 Cataler Corporation Exhaust gas purifying catalyst
EP1911517A4 (en) * 2005-08-01 2009-02-11 Cataler Corp Exhaust gas purifying catalyst
US7998896B2 (en) 2005-08-01 2011-08-16 Cataler Corporation Exhaust gas purifying catalyst
EP2047904A4 (en) * 2006-07-25 2009-09-02 Toyota Motor Co Ltd Catalyst for exhaust gas purification

Also Published As

Publication number Publication date
JP3721112B2 (en) 2005-11-30
JP2003117353A (en) 2003-04-22

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