KR910002507A - Catalysts for the purification of exhaust gases from internal combustion engines and gas turbines operating above stoichiometric ratios - Google Patents

Catalysts for the purification of exhaust gases from internal combustion engines and gas turbines operating above stoichiometric ratios Download PDF

Info

Publication number
KR910002507A
KR910002507A KR1019900011521A KR900011521A KR910002507A KR 910002507 A KR910002507 A KR 910002507A KR 1019900011521 A KR1019900011521 A KR 1019900011521A KR 900011521 A KR900011521 A KR 900011521A KR 910002507 A KR910002507 A KR 910002507A
Authority
KR
South Korea
Prior art keywords
catalyst
oxide
component
iron
internal combustion
Prior art date
Application number
KR1019900011521A
Other languages
Korean (ko)
Inventor
블룸리히 스테판
브란트 라인홀트
엥글러 베른트
혼넨 볼프강
코베르스타인 에드가
Original Assignee
볼프강 메르크, 로렌쯔 크로이쯔 비흘러
데구사 아크티엔게젤샤프트
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 볼프강 메르크, 로렌쯔 크로이쯔 비흘러, 데구사 아크티엔게젤샤프트 filed Critical 볼프강 메르크, 로렌쯔 크로이쯔 비흘러
Publication of KR910002507A publication Critical patent/KR910002507A/en

Links

Classifications

    • 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
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/847—Vanadium, niobium or tantalum or polonium
    • B01J23/8472—Vanadium
    • 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
    • B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8603—Removing sulfur compounds
    • B01D53/8609—Sulfur oxides
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8628—Processes characterised by a specific catalyst
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/864—Removing carbon monoxide or hydrocarbons
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8643—Removing mixtures of carbon monoxide or hydrocarbons and nitrogen oxides
    • 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
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals
    • B01J23/8933—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/8946—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali or alkaline earth metals
    • 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
    • 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
    • B01J29/18—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the mordenite type
    • 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
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths

Landscapes

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

Abstract

내용 없음No content

Description

화학량론적 비 이상에서 작동된 내연기관 및 가스 터어빈으로부터 발생한 배기가스의 정화용 촉매Catalysts for the purification of exhaust gases from internal combustion engines and gas turbines operating above stoichiometric ratios

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 작동시간에 따른 오염물의 전환 그래프이다.1 is a graph of conversion of contaminants with time of operation.

Claims (8)

필요한 경우 암모니아-분해 화합물로부터 암모니아 가스에 의한 질산화물의 선별적 환원을 위한 촉매를 함유하는 전면부위 및 산화 촉매를 함유하는 뒷전 부위를 갖는 벌집형의 원-피이스 배기가스 정화 촉매를 포함함을 특징으로하는, 화학량론적 비 이상에서 작동되는 내연기관 및 가스 터어빈으로부터 더욱 특히 발생한 배기 가스를 정화하는 촉매.A honeycomb one-phase exhaust gas purification catalyst having a front portion containing a catalyst for selective reduction of nitric oxide by ammonia gas from an ammonia-decomposing compound and a trailing portion containing an oxidation catalyst, if necessary. A catalyst for purifying exhaust gases more particularly generated from internal combustion engines and gas turbines operating above stoichiometric ratios. 제1항에 있어서, 환원 촉매가 A:B:C:D=1:0.01 내기 10:0 내지 0.2:0 내지 0.15의 원자비로The method of claim 1, wherein the reduction catalyst is A: B: C: D = 1: 0.01 bet 10: 0 to 0.2: 0 to 0.15 in an atomic ratio (A) 산화물 형태의 티타늄, (B) (B,1) 산화물 및/또는 설페이트 형태의 철 및 바나듐 및/또는 (B,2) 산화물 형태의 몰리브덴, 텅스텐, 니오븀, 구리 또는 크로뮴 그룹 중 적어도 하나 이상의 금속, (C) 산화물 형태의 주석 및/또는 (D) 산화물 형태의 베릴륨, 마그네슘, 아연, 붕소, 알루미늄, 이트륨, 회토류원소, 실리콘, 안티몬, 창연(bismuth) 및 망간의 그룹중에서 선택된 금속의 개시 혼합물을 포함하는 고체 촉매임을 특징으로 하는 촉매.At least one of (A) titanium in oxide form, (B) iron and vanadium in (B, 1) oxide and / or sulfate form and / or molybdenum, tungsten, niobium, copper or chromium group in (B, 2) oxide form The metals selected from the group consisting of beryllium, magnesium, zinc, boron, aluminum, yttrium, rare earth elements, silicon, antimony, bismuth and manganese in the form of (C) oxide and / or (D) oxide A catalyst characterized in that it is a solid catalyst comprising the starting mixture of. 제1항에 있어서, 환원촉매가 성분(A) 대 (B)의 금속의 원자비가 1:0.01 내지 1로서 성분 A)의 티타늄 이산화물, 성분 B1의 텅스텐 산화물 및 성분 B2의 바나듐, 철, 니오븀, 구리, 크로뮴 및/또는 몰리브덴 산화물을 포함함을 특징으로하는 고체 촉매로서, 성분 A)는 TiCl4의 화염 가수분해에 의해 수득될 수 있는 미세하게 분할된 산화물로서 주로 예추석(anatase)X-선구조를 갖고, BET표면적이 50±15㎡/g이며, 밀도 3.8g/㎥, 평균 1차 입자크기 30nm, 4％ 수성 분산액중 측정시 pH 3-4, 등전점 pH6.6이며, 1000℃에서 2시간동안 하소시킨 후 촉매의 TiO2함량이 99.5wt％, AI2O3함량이 0.3wt％, SiO2함량 0.2wt％, Fe2O3함량 0.01wt％ 및 HCL 함량 0.3wt％이고 105℃에서 2시간 건조시킨 후 중량 손실이 1.5wt％이고 1000℃에서 2시간 하소시킨후 중량 손실이 2wt％임을 특징으로 하는 촉매.The method according to claim 1, wherein the reduction catalyst is a titanium ratio of component (A) to component (A) to (B) of 1: 0.01 to 1, titanium dioxide of component A), tungsten oxide of component B 1 and vanadium of component B 2 , iron, As a solid catalyst characterized by containing niobium, copper, chromium and / or molybdenum oxides, component A) is a finely divided oxide which can be obtained by flame hydrolysis of TiCl 4 , mainly anatase X -BET structure, BET surface area is 50 ± 15m2 / g, density 3.8g / m3, average primary particle size 30nm, pH 3-4, isoelectric point pH6.6 when measured in 4% aqueous dispersion, 1000 ℃ After calcining for 2 hours at 99.5wt% TiO 2 content, 0.3wt% AI 2 O 3 content, 0.2wt% SiO 2 content, 0.01wt% Fe 2 O 3 content and 0.3wt% HCL A catalyst characterized in that the weight loss is 1.5wt% after drying at 2 캜 for 2 hours and the weight loss is 2wt% after calcining at 1000 캜 for 2 hours. 제1항에 있어서, 성분 A) 대 B)의 원자비가 1:0.001 내지 1, 바람직하게는 1:0.002 내지 0.4이고 성분 A) 가 BET 표면적 40 내지 500, 바람직하게는 50 내지 300, 보다 특정하게는 60 내지 150㎡/g인 반응성 고 표면적 티타늄 산화물 형태 및 완전히 또는 주로 아나타스(anatase)변형 형태로 전재하는 (A) 티타늄 산화물, (B1)텅스텐, 실리콘, 붕소, 알루미늄, 인, 지르코늄, 바륨, 이트륨, 란타늄 또는 세륨 중 적어도 하나 이상의 산화물 및 (B2) 바나듐, 니오븀, 몰리브덴, 철 구리 또는 크로뮴 중 적어도 하나 이상의 산화물을 함유하는 환원촉매인 촉매.The process according to claim 1, wherein the atomic ratio of component A) to B) is from 1: 0.001 to 1, preferably from 1: 0.002 to 0.4 and component A) has a BET surface area of 40 to 500, preferably 50 to 300, more particularly. Is (A) titanium oxide, (B 1 ) tungsten, silicon, boron, aluminum, phosphorus, zirconium, A catalyst which is a reducing catalyst containing at least one oxide of barium, yttrium, lanthanum or cerium and at least one oxide of (B 2 ) vanadium, niobium, molybdenum, iron copper or chromium. 제1항에 있어서, 환원 촉매가, 구리 및/또는 철 및, 임의로 세륨 또는 몰리브덴을 함유하는, 임의적으로 모오데나이트 유형의 내산성 제올라이트 충만형 촉매임을 특징으로하는 촉매.The catalyst according to claim 1, wherein the reduction catalyst is an acid resistant zeolite-filled catalyst, optionally of the mordenite type, containing copper and / or iron and, optionally, cerium or molybdenum. 제1항 내지 5항 중 어느 한 항에 있어서, 산화촉매가 제2항 내지 5항 중 어느 한 항에 따른 고체 압출물의 형태의 환원 촉매의 뒷전부위에 적용되는 피복물로서, 피복물이 20 내지 50％, 보다 특정하게는 촉매 총용적의 25 내지 35％로 구성됨을 특징으로 하는 촉매.The coating according to any one of claims 1 to 5, wherein the oxidation catalyst is applied to the rear of the reduction catalyst in the form of a solid extrudate according to any one of claims 2 to 5, wherein the coating is 20 to 50%. More particularly 25 to 35% of the total volume of the catalyst. 제1항 내지 6항 중 어느 한 항에 있어서, 산화촉매가 70중량％의 CeO2및 0 내지 20중량％의 ZrO2및 임의로 담체로서 휘토금속 산화물을 함유한 전이계열의 산화철, 알칼리토금속 산화물 및/또는 알루미늄 산화물 및 담체에 적용된 활성상 및 0.01 내지 3중량％의 백금, 팔라듐 및/또는 로듐을 함유하며, 존재하는 경우, 백금 및/또는 팔라듐 대 로듐의 중량비가 2:1 내지 30:1인 촉매.The transition catalyst according to any one of claims 1 to 6, wherein the oxidation catalyst contains 70 wt% CeO 2 and 0 to 20 wt% ZrO 2 and optionally a series of iron oxides, alkaline earth metal oxides and And / or the active phase applied to the aluminum oxide and the carrier and from 0.01 to 3% by weight of platinum, palladium and / or rhodium and, where present, have a weight ratio of platinum and / or palladium to rhodium of 2: 1 to 30: 1. catalyst. 특정하게는 화학량론적 비 이상에서 작동되는 내연기관 및 가스 터어빈으로부터 폐기가스를 오염물로부터 질산화물, 탄화수소, 일산화탄소, 질소제거로부터의 암모니아 드리프트 및 임의로 이산화황을 촉매적으로 정화하기 위한 촉매의 용도.Use of a catalyst for catalytically purifying ammonia drift from nitrogen oxides, hydrocarbons, carbon monoxide, nitrogen removal and optionally sulfur dioxide from contaminants from internal combustion engines and gas turbines operating specifically above stoichiometric ratios. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019900011521A 1989-07-28 1990-07-28 Catalysts for the purification of exhaust gases from internal combustion engines and gas turbines operating above stoichiometric ratios KR910002507A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3924983 1989-07-28
DEP39249832 1989-07-28
DEP3929297.5 1989-09-04
DE3929297A DE3929297C2 (en) 1989-07-28 1989-09-04 Catalyst for the purification of exhaust gases from superstoichiometrically operated internal combustion engines and gas turbines

Publications (1)

Publication Number Publication Date
KR910002507A true KR910002507A (en) 1991-02-25

Family

ID=6386019

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019900011521A KR910002507A (en) 1989-07-28 1990-07-28 Catalysts for the purification of exhaust gases from internal combustion engines and gas turbines operating above stoichiometric ratios

Country Status (3)

Country Link
KR (1) KR910002507A (en)
DD (1) DD296617A5 (en)
DE (2) DE3929297C2 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2108140C1 (en) * 1996-06-24 1998-04-10 Александр Юрьевич Логинов Method of treating exhaust gases
DE10323607B4 (en) * 2003-05-20 2019-05-09 Robert Bosch Gmbh Device for cleaning exhaust gases of an internal combustion engine
US20100166628A1 (en) 2006-02-15 2010-07-01 Nicola Soeger Catalyst for reducing nitrogen-containing pollutants from the exhaust gases of diesel engines
EP1961933B1 (en) * 2007-02-23 2010-04-14 Umicore AG & Co. KG Catalytically activated diesel particulate filter with ammoniac blocking action
DE102008035268A1 (en) 2008-07-29 2010-03-25 Mykhaylo Koltun Fluids and gases catalytic processing method for e.g. liquid fuel jet engines, involves additionally implementing reduction- and/or oxidation agents in chemical process for achieving and maintaining efficiency of catalytic converter
DE202008010122U1 (en) 2008-07-29 2009-05-14 Koltun, Mykhaylo Device for carrying out the exhaust gas purification method (gasoline engine)
DE102008035270B4 (en) 2008-07-29 2023-08-03 Mykhaylo Koltun Process and device for processing exhaust gases (gasoline engine)
DE202008010121U1 (en) 2008-07-29 2009-05-14 Koltun, Mykhaylo Device for carrying out the exhaust gas purification method (diesel engine)
DE102008035271B4 (en) 2008-07-29 2023-06-29 Genady Maslov Method and device for processing exhaust gases (diesel engine)
DE202008010119U1 (en) 2008-07-29 2009-05-07 Koltun, Mykhaylo Device for cleaning exhaust gases of turbojet engines
DE102008055890A1 (en) * 2008-11-05 2010-05-12 Süd-Chemie AG Particulate reduction with combined SCR and NH3 slip catalyst
DE102015014312A1 (en) * 2015-11-05 2017-05-11 Tropinon Enterprises Ltd. Method for reducing the NOx emission in the exhaust system of a vehicle with an internal combustion engine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085193A (en) * 1973-12-12 1978-04-18 Mitsubishi Petrochemical Co. Ltd. Catalytic process for reducing nitrogen oxides to nitrogen
GB1586530A (en) * 1977-05-31 1981-03-18 Caterpillar Tractor Co Two-stage catalysts of engine exhaust
US4325924A (en) * 1977-10-25 1982-04-20 Electric Power Research Institute, Inc. Urea reduction of NOx in fuel rich combustion effluents
DE2907106C2 (en) * 1979-02-23 1985-12-19 Degussa Ag, 6000 Frankfurt Catalytic converter and its use for cleaning exhaust gases from internal combustion engines
DE3601378A1 (en) * 1986-01-18 1987-07-23 Degussa METHOD FOR PURIFYING OXIDES OF NITROGEN AND EXHAUST GASES CONTAINING SULFUR FROM COMBUSTION PLANTS
FR2622126B1 (en) * 1987-10-21 1991-06-14 Procatalyse Ste Fse Produits C CATALYST FOR THE TREATMENT OF EXHAUST GASES FROM INTERNAL COMBUSTION ENGINES AND MANUFACTURING METHOD THEREOF
DE3740289A1 (en) * 1987-11-27 1989-06-08 Degussa CATALYST FOR THE SELECTIVE REDUCTION OF NITROGEN OXIDES WITH AMMONIA

Also Published As

Publication number Publication date
DD296617A5 (en) 1991-12-12
DE59004874D1 (en) 1994-04-14
DE3929297C2 (en) 1996-03-14
DE3929297A1 (en) 1991-01-31

Similar Documents

Publication Publication Date Title
US5120695A (en) Catalyst for purifying exhaust gases from internal combustion engines and gas turbines operated at above the stoichiometric ratio
KR0136893B1 (en) Selective catalytic reduction of nitrogen oxide
US5804152A (en) Method for purifying exhaust gases
US4814153A (en) Method of cleaning exhaust gases
MXPA03010426A (en) Catalyst for purification of diesel engine exhaust gas.
KR20000011064A (en) Composition having cerium oxide and zirconium oxide as substrate, producing method thereof and its use as catalyst
JP3594432B2 (en) Catalyst, method for producing the same and use thereof
CA2032799A1 (en) Catalyst for and method of purifying oxygen-excess exhaust gas
KR910002507A (en) Catalysts for the purification of exhaust gases from internal combustion engines and gas turbines operating above stoichiometric ratios
JP2000507877A (en) Method for treating exhaust gas from an internal combustion engine operated with a sulfur-containing fuel
EP0781592B1 (en) Exhaust gas purification method by reduction of nitrogen oxides
US6119451A (en) Nitrogen oxide removal using diesel fuel and a catalyst
JP2006326437A (en) Catalyst for catalytic reduction of nitrogen oxide
US20060034740A1 (en) Catalyst composition for use in a lean NOx trap and method of using
ZA200200420B (en) Thermally stable support material and method for making the same.
EP0530734A1 (en) Catalyst for purifying exhaust gases of diesel engine
JPH0884911A (en) Catalyst for decomposing nitrogen oxide and method for purifying diesel engine exhaust using the same
EP0711198A1 (en) Base metal catalyst and two-stage process for the purification of vehicle exhaust gases
KR950007944A (en) Catalyst component for exhaust gas purification, its manufacturing method and method for producing catalyst member for exhaust gas purification
CA2278360A1 (en) Reduction of nitrogen oxide
JP2002361090A (en) Catalyst for cleaning exhaust gas
JP2619470B2 (en) Catalyst for simultaneous removal of nitrogen oxides and carbon monoxide
JP3131630B2 (en) Method for oxidizing and removing carbon fine particles in diesel engine exhaust gas and catalyst used therefor
JP2506588B2 (en) Nitrogen oxide removal method
JPH1066867A (en) Catalyst for cleaning exhaust gas and method for cleaning exhaust gas by the catalyst

Legal Events

Date Code Title Description
WITN Application deemed withdrawn, e.g. because no request for examination was filed or no examination fee was paid