FR2170614A5 - Purificn of exhaust gases - with controlled air supply and metal oxide/noble metal catalysts - Google Patents
Purificn of exhaust gases - with controlled air supply and metal oxide/noble metal catalystsInfo
- Publication number
- FR2170614A5 FR2170614A5 FR7246734A FR7246734A FR2170614A5 FR 2170614 A5 FR2170614 A5 FR 2170614A5 FR 7246734 A FR7246734 A FR 7246734A FR 7246734 A FR7246734 A FR 7246734A FR 2170614 A5 FR2170614 A5 FR 2170614A5
- Authority
- FR
- France
- Prior art keywords
- exhaust gases
- purificn
- metal oxide
- air supply
- noble metal
- 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
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
-
- 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)
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Catalysts (AREA)
Abstract
In a process for purifying exhaust gases (esp. from petrol engines) by conversion of CO, hydrocarbons and nitrogen oxides into harmless cpds. using a catalyst, the excess O2 content of the mixt. of exhaust gas and air passing through the catalyst bed is adjusted to a value 1.5-2 time the theoretical O2 content. The catalyst pref. comprises at least one 4th-period transition metal oxide and at least one Gp. VIII noble metal. The use of the above O2 excess increases the nitrogen oxide conversion while only slightly decreasing the conversion of CO and hydrocarbons.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP47002226A JPS4871388A (en) | 1971-12-28 | 1971-12-28 | |
JP47005882A JPS4875456A (en) | 1972-01-14 | 1972-01-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2170614A5 true FR2170614A5 (en) | 1973-09-14 |
Family
ID=26335567
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7246734A Expired FR2170614A5 (en) | 1971-12-28 | 1972-12-28 | Purificn of exhaust gases - with controlled air supply and metal oxide/noble metal catalysts |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2263387A1 (en) |
FR (1) | FR2170614A5 (en) |
IT (1) | IT976205B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4297328A (en) * | 1979-09-28 | 1981-10-27 | Union Carbide Corporation | Three-way catalytic process for gaseous streams |
DE3405100A1 (en) * | 1984-02-14 | 1985-08-14 | Drägerwerk AG, 2400 Lübeck | PT CATALYST ON A CARRIER AS AN AIR PURIFIER |
-
1972
- 1972-12-23 DE DE2263387A patent/DE2263387A1/en active Pending
- 1972-12-28 FR FR7246734A patent/FR2170614A5/en not_active Expired
- 1972-12-28 IT IT7271109A patent/IT976205B/en active
Also Published As
Publication number | Publication date |
---|---|
DE2263387A1 (en) | 1973-07-26 |
IT976205B (en) | 1974-08-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |