GB1425481A - Process for reducing nitrogen oxide emission from automobile exhausts - Google Patents

Process for reducing nitrogen oxide emission from automobile exhausts

Info

Publication number
GB1425481A
GB1425481A GB1390273A GB1390273A GB1425481A GB 1425481 A GB1425481 A GB 1425481A GB 1390273 A GB1390273 A GB 1390273A GB 1390273 A GB1390273 A GB 1390273A GB 1425481 A GB1425481 A GB 1425481A
Authority
GB
United Kingdom
Prior art keywords
exhaust gases
oxygen
catalyst
air
jet
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB1390273A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Monsanto Co
Original Assignee
Monsanto Co
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
Priority to US315066A priority Critical patent/US3886260A/en
Priority claimed from US315066A external-priority patent/US3886260A/en
Application filed by Monsanto Co filed Critical Monsanto Co
Priority to GB1390273A priority patent/GB1425481A/en
Priority to FR7344633A priority patent/FR2328369A5/en
Priority to JP48139554A priority patent/JPS49135022A/ja
Priority to DE2362048A priority patent/DE2362048A1/en
Publication of GB1425481A publication Critical patent/GB1425481A/en
Expired legal-status Critical Current

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
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] 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
    • B01D53/92—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
    • 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
    • B01D53/9431—Processes characterised by a specific device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/34—Arrangements for supply of additional air using air conduits or jet air pumps, e.g. near the engine exhaust port
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/202—Hydrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/204—Carbon monoxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/208—Hydrocarbons
    • 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
    • B01D2255/207—Transition metals
    • B01D2255/20753—Nickel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

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

Abstract

1425481 Treating exhaust gases MONSANTO CO 22 March 1973 13902/73 Heading C1A Nitrogen oxides are removed from automobile exhaust gases which also contain oxygen, carbon monoxide, hydrogen and hydrocarbons by contacting the gases at elevated temperatures with a catalyst containing rhodium on a support in an amount of less than 0À05% by weight under conditions which on the average are reducing but where sufficient oxygen is present to keep the ammonia production to no more than 100 p.p.m. but insufficient to prevent at least 90% reduction of the nitrogen oxides. The catalyst suitably contains 0À005 to 0À005% rhodium and may also contain nickel, platinum and halide ions. The support is preferably on a transition alumina and may be in the form of an alumina-coated ceramic. The process is preferably operated at above 600‹ C. and the average amount of oxygen is preferably no greater than 2% by volume. The process is suitable for engines operating with a rich air to fuel ratio. Supplementary air is added to the exhaust gases prior to contact with the catalyst to obtain the required oxygen content, e.g. by impinging a jet of air upon a jet of exhaust gases.
GB1390273A 1971-09-25 1973-03-22 Process for reducing nitrogen oxide emission from automobile exhausts Expired GB1425481A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US315066A US3886260A (en) 1971-09-25 1972-12-14 Process for reducing nitrogen oxides
GB1390273A GB1425481A (en) 1972-12-14 1973-03-22 Process for reducing nitrogen oxide emission from automobile exhausts
FR7344633A FR2328369A5 (en) 1972-12-14 1973-12-13 PROCESS FOR THE REDUCTION OF NITROGEN OXIDES IN AUTOMOTIVE EXHAUSTS, USING RHODIUM-BASED CATALYSTS
JP48139554A JPS49135022A (en) 1972-12-14 1973-12-13
DE2362048A DE2362048A1 (en) 1972-12-14 1973-12-13 PROCESS AND CATALYST FOR REDUCING NITROGEN OXIDES

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US315066A US3886260A (en) 1971-09-25 1972-12-14 Process for reducing nitrogen oxides
GB1390273A GB1425481A (en) 1972-12-14 1973-03-22 Process for reducing nitrogen oxide emission from automobile exhausts
US36841273A 1973-06-08 1973-06-08

Publications (1)

Publication Number Publication Date
GB1425481A true GB1425481A (en) 1976-02-18

Family

ID=27257056

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1390273A Expired GB1425481A (en) 1971-09-25 1973-03-22 Process for reducing nitrogen oxide emission from automobile exhausts

Country Status (4)

Country Link
JP (1) JPS49135022A (en)
DE (1) DE2362048A1 (en)
FR (1) FR2328369A5 (en)
GB (1) GB1425481A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005099873A1 (en) * 2004-04-16 2005-10-27 Hte Aktiengesellschaft The High Throughput Experimentation Company Process for the removal of harmful substances from exhaust gases of combustion engines and catalyst for carrying out said process

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6174504B1 (en) * 1996-04-01 2001-01-16 Asec Manufacturing Methods of control of nitrogen oxide and hydrocarbon emissions from small engines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005099873A1 (en) * 2004-04-16 2005-10-27 Hte Aktiengesellschaft The High Throughput Experimentation Company Process for the removal of harmful substances from exhaust gases of combustion engines and catalyst for carrying out said process
US8087235B2 (en) 2004-04-16 2012-01-03 Hte Aktiengesellschaft The High Throughput Experimentation Company Process for the removal of harmful substances from exhaust gases of combustion engines and catalyst for carrying out said process

Also Published As

Publication number Publication date
FR2328369A5 (en) 1977-05-13
JPS49135022A (en) 1974-12-26
DE2362048A1 (en) 1974-06-27

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed