GB1431377A - Catalytic process - Google Patents

Catalytic process

Info

Publication number
GB1431377A
GB1431377A GB1758272A GB1758272A GB1431377A GB 1431377 A GB1431377 A GB 1431377A GB 1758272 A GB1758272 A GB 1758272A GB 1758272 A GB1758272 A GB 1758272A GB 1431377 A GB1431377 A GB 1431377A
Authority
GB
United Kingdom
Prior art keywords
gas
exhaust gas
engine
ratio
fuel
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
GB1758272A
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 US00171589A priority Critical patent/US3756740A/en
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB1758272A priority patent/GB1431377A/en
Priority to IT2307973A priority patent/IT988627B/en
Priority to FR7313677A priority patent/FR2181336A5/fr
Priority to JP7342769A priority patent/JPS4947243A/ja
Priority to DE19732319527 priority patent/DE2319527A1/en
Publication of GB1431377A publication Critical patent/GB1431377A/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
    • B01D53/9459—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
    • B01D53/92—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
    • B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
    • 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

Abstract

1431377 Gas separation IMPERIAL CHEMICAL INDUSTRIES Ltd 5 April 1973 [17 April 1972] 17582/72 Heading C1A [Also in Division B1] A process for treating I.C. engine exhaust gas containing nitrogen oxides and oxidizing and reducing compounds comprises providing for the reducing power of the gas to be at a level corresponding to an overall ratio of 0À95 to 1À0, the overall ratio being defined as the total weight of air supplied to the engine and to the exhaust gas before treatment divided by the total weight of fuel supplied to the engine and exhaust gas, and passing the gas over a catalyst containing rhodium. Where no air or fuel is added to the exhaust gas the overall ratio is the air/fuel ratio of the mixture provided at the engine inlet. The preferred ratio is 0À97 to 0À99. The reducing power of the gas is expressed as CO + H 2 -20 2 in volumes per cent, the preferred value is less than 1À3, e.g. 0À1 to 1À0. The catalyst comprises a refractory support, e.g. magnesia, alumina, silica, titania, zirconia, hafnia, thoria or chromia, or mixtures or compounds of these with each other or with oxides of calcium, strontium or barium. The surface area of the support is 0À02 to 30 sq. m./gm. and it is formed as discrete particles. The rhodium content is 0À001 to 5% by wt. preferably 0À005 to 5%. Other platinum group metals may also be present. The operating temperature is 200- 800‹ C., preferably 450-650‹ C. The space velocity is 20,000 to 200,000 especially 100,000/ hr. at full throttle.
GB1758272A 1971-08-11 1972-04-17 Catalytic process Expired GB1431377A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00171589A US3756740A (en) 1971-08-11 1971-08-13 Turbine stage
GB1758272A GB1431377A (en) 1972-04-17 1972-04-17 Catalytic process
IT2307973A IT988627B (en) 1972-04-17 1973-04-16 CATALYTIC PROCESS FOR THE ELIMINATION OF NITROGEN OXIDES FROM EXHAUST GAS OF INTERNAL COMBUSTION ENGINES
FR7313677A FR2181336A5 (en) 1972-04-17 1973-04-16
JP7342769A JPS4947243A (en) 1972-04-17 1973-04-17
DE19732319527 DE2319527A1 (en) 1972-04-17 1973-04-17 METHOD OF TREATMENT OF EXHAUST GAS FROM COMBUSTION ENGINES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1758272A GB1431377A (en) 1972-04-17 1972-04-17 Catalytic process

Publications (1)

Publication Number Publication Date
GB1431377A true GB1431377A (en) 1976-04-07

Family

ID=10097697

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1758272A Expired GB1431377A (en) 1971-08-11 1972-04-17 Catalytic process

Country Status (5)

Country Link
JP (1) JPS4947243A (en)
DE (1) DE2319527A1 (en)
FR (1) FR2181336A5 (en)
GB (1) GB1431377A (en)
IT (1) IT988627B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071600A (en) 1976-12-06 1978-01-31 General Motors Corporation Process for improved 3-way emission control

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1383896A (en) * 1972-06-14 1974-02-12 Grace W R & Co Process of removing noxious components from exhaust gases with the aid of a catalyst
JPS51101780A (en) * 1975-03-06 1976-09-08 Nissan Motor
JPS5432167A (en) * 1977-08-15 1979-03-09 Osaka Sanso Kougiyou Kk Gas purification

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071600A (en) 1976-12-06 1978-01-31 General Motors Corporation Process for improved 3-way emission control

Also Published As

Publication number Publication date
IT988627B (en) 1975-04-30
FR2181336A5 (en) 1973-11-30
JPS4947243A (en) 1974-05-07
DE2319527A1 (en) 1973-10-31

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees