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WO2003057365A1 - Process for catalytic reduction of nitrogen oxides and catalyst therefor - Google Patents

Process for catalytic reduction of nitrogen oxides and catalyst therefor Download PDF

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Publication number
WO2003057365A1
WO2003057365A1 PCT/JP2002/013718 JP0213718W WO03057365A1 WO 2003057365 A1 WO2003057365 A1 WO 2003057365A1 JP 0213718 W JP0213718 W JP 0213718W WO 03057365 A1 WO03057365 A1 WO 03057365A1
Authority
WO
WIPO (PCT)
Prior art keywords
oxides
catalytic reduction
adsorbent
nitrogen oxides
rhodium
Prior art date
Application number
PCT/JP2002/013718
Other languages
French (fr)
Japanese (ja)
Inventor
Tadao Nakatsuji
Original Assignee
Valtion Teknillinen Tutkimuskeskus
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 filed Critical Valtion Teknillinen Tutkimuskeskus
Priority to AU2002359924A priority Critical patent/AU2002359924A1/en
Publication of WO2003057365A1 publication Critical patent/WO2003057365A1/en

Links

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
    • B01D2255/1025—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
    • B01D2255/202—Alkali metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/204—Alkaline earth metals
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/40—Mixed oxides
    • B01D2255/402—Perovskites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/902—Multilayered catalyst
    • B01D2255/9022—Two layers
    • 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
    • B01J23/58—Platinum group metals with alkali- or alkaline earth metals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

A catalyst structure for the catalytic reduction of nitrogen oxides contained in an exhaust gas generated by the combustion of a fuel fed under a periodic rich/lean condition, which comprises on an inert substrate (A) a surface catalyst layer containing as the surface catalyst component (a) ceria, (b) praseodymium oxide, or (c) at least one member selected from among mixtures of oxides of at least two elements selected from among cerium, zirconium, praseodymium, neodymium, terbium, samarium, gadolinium, and lanthanum, and double oxides of at least two elements selected from among the same, and (B) an inner catalyst layer containing as the inner catalyst component (a) at least one member selected from among platinum, rhodium, platinum oxides, rhodium oxides and palladium oxides, (b) an NOx absorbent/adsorbent, and (c) a carrier. The above NOx absorbent/adsorbent is an alkali metal compound, an alkaline earth metal compound, a double oxide having magneto-plumbite structure, or a double oxide having perovskite structure.
PCT/JP2002/013718 2001-12-28 2002-12-26 Process for catalytic reduction of nitrogen oxides and catalyst therefor WO2003057365A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002359924A AU2002359924A1 (en) 2001-12-28 2002-12-26 Process for catalytic reduction of nitrogen oxides and catalyst therefor

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2001401946 2001-12-28
JP2001-401946 2001-12-28
JP2002030173 2002-02-06
JP2002-030173 2002-02-06

Publications (1)

Publication Number Publication Date
WO2003057365A1 true WO2003057365A1 (en) 2003-07-17

Family

ID=26625421

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/013718 WO2003057365A1 (en) 2001-12-28 2002-12-26 Process for catalytic reduction of nitrogen oxides and catalyst therefor

Country Status (2)

Country Link
AU (1) AU2002359924A1 (en)
WO (1) WO2003057365A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023276793A1 (en) * 2021-06-28 2023-01-05 エヌ・イーケムキャット株式会社 Oxidation catalyst for exhaust gas purification

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5849660A (en) * 1995-02-24 1998-12-15 Mazda Motor Corporation Catalyst for purifying exhaust gas
JPH1170332A (en) * 1997-06-20 1999-03-16 Degussa Ag Internal combustion engine exhaust gas purifying catalyst and its manufacture
US6090744A (en) * 1996-03-28 2000-07-18 Mazda Motor Corporation Catalyst for cleaning exhaust gas
US6143691A (en) * 1995-12-27 2000-11-07 Ict Co., Ltd Purifying catalyst for exhaust gas from internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5849660A (en) * 1995-02-24 1998-12-15 Mazda Motor Corporation Catalyst for purifying exhaust gas
US6143691A (en) * 1995-12-27 2000-11-07 Ict Co., Ltd Purifying catalyst for exhaust gas from internal combustion engine
US6090744A (en) * 1996-03-28 2000-07-18 Mazda Motor Corporation Catalyst for cleaning exhaust gas
JPH1170332A (en) * 1997-06-20 1999-03-16 Degussa Ag Internal combustion engine exhaust gas purifying catalyst and its manufacture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023276793A1 (en) * 2021-06-28 2023-01-05 エヌ・イーケムキャット株式会社 Oxidation catalyst for exhaust gas purification

Also Published As

Publication number Publication date
AU2002359924A1 (en) 2003-07-24

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