CA1317231C - Process for the production of a catalytic converter for exhaust-gas cleaning and catalytic converter produced according to this - Google Patents
Process for the production of a catalytic converter for exhaust-gas cleaning and catalytic converter produced according to thisInfo
- Publication number
- CA1317231C CA1317231C CA000586695A CA586695A CA1317231C CA 1317231 C CA1317231 C CA 1317231C CA 000586695 A CA000586695 A CA 000586695A CA 586695 A CA586695 A CA 586695A CA 1317231 C CA1317231 C CA 1317231C
- Authority
- CA
- Canada
- Prior art keywords
- catalytic converter
- exhaust
- production
- metal
- catalytic
- 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 - Fee Related
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 7
- 230000003197 catalytic effect Effects 0.000 title abstract description 44
- 238000000034 method Methods 0.000 title abstract description 9
- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 23
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 17
- 238000002485 combustion reaction Methods 0.000 claims abstract description 5
- 239000003054 catalyst Substances 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims description 2
- 238000000465 moulding Methods 0.000 abstract description 3
- 239000000919 ceramic Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 108091028109 FinP Proteins 0.000 description 1
- 102220565460 Killer cell immunoglobulin-like receptor 2DL2_A15Q_mutation Human genes 0.000 description 1
- 241001296096 Probles Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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]
- B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
-
- B01J35/56—
-
- 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
-
- 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
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
-
- 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
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/14—Sintered material
-
- 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
Abstract
A B S T R A C T
Process for the Production of a Catalytic Converter for Exhaust-Gas Cleaning and Catalytic Converter Pro-duced according to this In a process for the production of a catalytic converter for the cleaning of exhaust gases of internal-combustion engines by means of a catalytic converter body through which flow the exhaust gases, the catalytic converter body (10) is compression-molded from metal wire pieces or metal chips and sintered after molding.
Process for the Production of a Catalytic Converter for Exhaust-Gas Cleaning and Catalytic Converter Pro-duced according to this In a process for the production of a catalytic converter for the cleaning of exhaust gases of internal-combustion engines by means of a catalytic converter body through which flow the exhaust gases, the catalytic converter body (10) is compression-molded from metal wire pieces or metal chips and sintered after molding.
Description
-` 13~723~
PROCESS FOR THE PRODUCTION OF A CATALYTIC CONVERTER FOR
ACCORDING TO THIS
The invention relates to a process for the production of a catalytic converter (also named as catalyst) for the cleaning of the exhaust gases of internal-combustion engines by a catalytic converter body through which flow the exhaust gases, and a catalytic converter body produced according to this.
Catalytic converters are being increasingly used in automobile engine technology to convert noxious exhaust-gas components into harmless ones, with the intention being particularly to reduce the emission of carbon monoxide, hydrocarbons and nitrogen oxides.
:
The principal components of a catalytic exhaust-gas cleaning unit are the catalytic converter carrier, or catalytic converter body, its precious-metal coating and a housing surrounding the catalytic converter body.
.
'~
g :. . .
~31723~
Generally used as a carrier for the catalytic converter is a honeycomb-like-structured ceramic cyl.inder with a circular or oval cross-section. This type has until now been the one which has met with the greatest success as compared to other carrier structures, such as, for example, granulate or profiles and wound sheet-metal strips. The honeycomb character is created by a plurality of finP
channels which run through ~he catalytic converter body in the direction of flow of the exhaust gases. On the catalytic converter body is mounted the actual catalytic converter, for which predominantly platinum, rhodium and palladium are used.
What is problematic, in particular with the use of a catalytic converter body of ceramic, is its fracture-resistant mounting, due to the brittle ceramic material.
In connection w1th the thin-walled honeycomb pattern the catalytic converter body is extremely sensitive to vi-brations, impact and other mechanical influence.s. A15Q
to be ta]cen into account are the exhaust-gas impulses and the high exhaust-gas temperatures, which may reach up to approx. 900 degrees C.
To avoid the rislc of fracture due to external influences or proper motions of the ceramic body, said body is held ~31723~
in a highly heat-resistant wire shrouding, it having to be ensured by so-called bypass seals that exhaust gases do not ~low past the ceramic bloc]s through the wire reti-culation.
The ceramic body and the wire reticulation are in general surrounded by a ca-talytic converter housing which has the additional task of protecting the sensitive cerami¢ body against rapid changes in temperature, e.g., due to splash water and mechanical impacts.
Due to the costly production method and the necessary secure packaging of the catalytic converter body such a catalytic converter is relatively costly and expensive.
The present invention is therefore based on the tas~ of creating a catalytic converter which eliminates the aforementioned disadvantages, in particular which pos-sesses a good or even more improved catalytic effect with a simple structure.
This proble~ is solved according to the invention in that the catalytic converter body is compression-molded from metal wire pieces or metal chips and sintered after molding.
~L3~723~
- 3a -In accordance with a particular embodiment of the invention, there is provided a catalyst for cleaning exhaust gases from combustion Pngines, comprising a catalyst body consisting of compression moulded and then sintered metal wire pieces or metal chips and traversed by the exhaust gases, characterized in that the catalyst body is formed by a plurality of moulded segments of different densities arranged one behind the other.
B
~3~7~3~
The production of diverse molded parts in powder metal-lurgy from metal powder is common knowledge. The powders used are compression-molded in cold or hot condition and subsequently sintered. By sintering is meant a heating in reducing atmosphere to temperatures which lie in the level of 2/3 to 4/5 of the melting poin-t of the metal powder used. In this process the metal sufaces bake together, with a simultaneous consolidation o~ the powder mixture.
Characteristics of a sintered body are its porosity and a small expansion.
Surprisingly, it has now been found that in a molding and sintering of metal wire pieces and/or metal chips, parts with very low density instead of powder can be produced with a high material strength. In particular it has been found that such sintered parts possess a high absorption power for in~iltrations or for a ~low-through. In addition, they exhibit, compared to the known materials, a signifi-cantly higher flowability around the surface. In an inven-tive way it has now been determined that such a body can surprisingly and-very advantageously be used as a cata~-lytic converter body. In the process the body may, after sintering, have to be solely coated in the well-known way with the actuaI catalytic material. If necessar~, an inter-mediate layer (wash-coat) can in the usual way be applied to enlarge the effective surface, after which the body can be covered with the precious metals, such as platinum and rhodium.
5- 13~723~
It is, however, conceivable to produce the sintered body itself from a material which exhibits catalytic properties.
In this case the subsequen-t coa-ting with a catalytic ma-terial can be omitted.
It has now been found that with the process according to the invention a catalytic converter with very good cata-lytic effect is created.
With the catalytic converter body according to the inven-tion, a further disadvantage with the known catalytic converters is also largely reduced. As is generally known, due to the installation of a catalytic converter and the ensuing flow resistance a reduction in the power of the internal-combustion engine must be accepted, which applies parti-cularly to full-load operation.
The catalytic converter body according to the invention produces a lower flow resistance, which thus exerts a positive influence on the power of the com~ s~ion engine.
In the process, the flow resistance can also be controlled or further reduced by a splitting of the catalytic conver-ter body into a plurality of molded segments arranged one after the other.
As is generally know, the flow resistance increases over the length of the catalytic converter body. If,one now - 6 - ~3~7~
uses, in a ~urther embodiment according to the invention, a plurality of molded segments arranged one after the other and contacting one another, with their density decreasing in the direction of flow of the exhaust gas, the flow resistance can be reduced even more intensely.
By the production process according to the invention, such molded segments of differing density, which are then combined accordingly, can be produced without any problems.
Since the catalytic converter body according to the in-vention is not susceptible to fracture, the catalytic converter itself can be made simpler in structure. Thus no flexible mounting is necessary and, as the case may be, even a protective tube or a housing can be eliminated.
As sizes for the metal wire pieces or the metal chips, diameters or widths of approx. 0.1 - 5 mm and lengths of 0.5 - 30 mm are possible. Here, however, the length or width is generally always distinctly greater than the diameter.
As materials for the metal wire pieces the most varied substances are possible, with care solely having to be taken that these are resistant to the high temperatures to be expected. Thus, for example, ferritic and austenitic steel, special alloys and the like are conceivable.
13~3~
In the following, a catalytic converter body according to the invention is shown with regard to its principles with reference to the drawing.
The catalytic converter body is produced in the known way by compression-molding and subse~uently sintered, with the shape being selected so that a cylindrical form is created for the catalytic converter body 10.
To reduce the flow resistance the catalytic converter body 10 is formed from a plurality of cylinder segments 1-4 arranged one after the other. The individual molded segments are pressed close to one another and their den-sity ~ decreases in the direction of through-~low from 1 ~4' As basic material-metal chips can be used instead of short metal wire pieces. These are obtained, for example, by punching, turning, planing or milling in widths of 1-5 mm and lengths of 1-20mm, prePerably of 2~3mm and 5-10mm. Here, the width may also change over the length according to the form of cutting operation.
PROCESS FOR THE PRODUCTION OF A CATALYTIC CONVERTER FOR
ACCORDING TO THIS
The invention relates to a process for the production of a catalytic converter (also named as catalyst) for the cleaning of the exhaust gases of internal-combustion engines by a catalytic converter body through which flow the exhaust gases, and a catalytic converter body produced according to this.
Catalytic converters are being increasingly used in automobile engine technology to convert noxious exhaust-gas components into harmless ones, with the intention being particularly to reduce the emission of carbon monoxide, hydrocarbons and nitrogen oxides.
:
The principal components of a catalytic exhaust-gas cleaning unit are the catalytic converter carrier, or catalytic converter body, its precious-metal coating and a housing surrounding the catalytic converter body.
.
'~
g :. . .
~31723~
Generally used as a carrier for the catalytic converter is a honeycomb-like-structured ceramic cyl.inder with a circular or oval cross-section. This type has until now been the one which has met with the greatest success as compared to other carrier structures, such as, for example, granulate or profiles and wound sheet-metal strips. The honeycomb character is created by a plurality of finP
channels which run through ~he catalytic converter body in the direction of flow of the exhaust gases. On the catalytic converter body is mounted the actual catalytic converter, for which predominantly platinum, rhodium and palladium are used.
What is problematic, in particular with the use of a catalytic converter body of ceramic, is its fracture-resistant mounting, due to the brittle ceramic material.
In connection w1th the thin-walled honeycomb pattern the catalytic converter body is extremely sensitive to vi-brations, impact and other mechanical influence.s. A15Q
to be ta]cen into account are the exhaust-gas impulses and the high exhaust-gas temperatures, which may reach up to approx. 900 degrees C.
To avoid the rislc of fracture due to external influences or proper motions of the ceramic body, said body is held ~31723~
in a highly heat-resistant wire shrouding, it having to be ensured by so-called bypass seals that exhaust gases do not ~low past the ceramic bloc]s through the wire reti-culation.
The ceramic body and the wire reticulation are in general surrounded by a ca-talytic converter housing which has the additional task of protecting the sensitive cerami¢ body against rapid changes in temperature, e.g., due to splash water and mechanical impacts.
Due to the costly production method and the necessary secure packaging of the catalytic converter body such a catalytic converter is relatively costly and expensive.
The present invention is therefore based on the tas~ of creating a catalytic converter which eliminates the aforementioned disadvantages, in particular which pos-sesses a good or even more improved catalytic effect with a simple structure.
This proble~ is solved according to the invention in that the catalytic converter body is compression-molded from metal wire pieces or metal chips and sintered after molding.
~L3~723~
- 3a -In accordance with a particular embodiment of the invention, there is provided a catalyst for cleaning exhaust gases from combustion Pngines, comprising a catalyst body consisting of compression moulded and then sintered metal wire pieces or metal chips and traversed by the exhaust gases, characterized in that the catalyst body is formed by a plurality of moulded segments of different densities arranged one behind the other.
B
~3~7~3~
The production of diverse molded parts in powder metal-lurgy from metal powder is common knowledge. The powders used are compression-molded in cold or hot condition and subsequently sintered. By sintering is meant a heating in reducing atmosphere to temperatures which lie in the level of 2/3 to 4/5 of the melting poin-t of the metal powder used. In this process the metal sufaces bake together, with a simultaneous consolidation o~ the powder mixture.
Characteristics of a sintered body are its porosity and a small expansion.
Surprisingly, it has now been found that in a molding and sintering of metal wire pieces and/or metal chips, parts with very low density instead of powder can be produced with a high material strength. In particular it has been found that such sintered parts possess a high absorption power for in~iltrations or for a ~low-through. In addition, they exhibit, compared to the known materials, a signifi-cantly higher flowability around the surface. In an inven-tive way it has now been determined that such a body can surprisingly and-very advantageously be used as a cata~-lytic converter body. In the process the body may, after sintering, have to be solely coated in the well-known way with the actuaI catalytic material. If necessar~, an inter-mediate layer (wash-coat) can in the usual way be applied to enlarge the effective surface, after which the body can be covered with the precious metals, such as platinum and rhodium.
5- 13~723~
It is, however, conceivable to produce the sintered body itself from a material which exhibits catalytic properties.
In this case the subsequen-t coa-ting with a catalytic ma-terial can be omitted.
It has now been found that with the process according to the invention a catalytic converter with very good cata-lytic effect is created.
With the catalytic converter body according to the inven-tion, a further disadvantage with the known catalytic converters is also largely reduced. As is generally known, due to the installation of a catalytic converter and the ensuing flow resistance a reduction in the power of the internal-combustion engine must be accepted, which applies parti-cularly to full-load operation.
The catalytic converter body according to the invention produces a lower flow resistance, which thus exerts a positive influence on the power of the com~ s~ion engine.
In the process, the flow resistance can also be controlled or further reduced by a splitting of the catalytic conver-ter body into a plurality of molded segments arranged one after the other.
As is generally know, the flow resistance increases over the length of the catalytic converter body. If,one now - 6 - ~3~7~
uses, in a ~urther embodiment according to the invention, a plurality of molded segments arranged one after the other and contacting one another, with their density decreasing in the direction of flow of the exhaust gas, the flow resistance can be reduced even more intensely.
By the production process according to the invention, such molded segments of differing density, which are then combined accordingly, can be produced without any problems.
Since the catalytic converter body according to the in-vention is not susceptible to fracture, the catalytic converter itself can be made simpler in structure. Thus no flexible mounting is necessary and, as the case may be, even a protective tube or a housing can be eliminated.
As sizes for the metal wire pieces or the metal chips, diameters or widths of approx. 0.1 - 5 mm and lengths of 0.5 - 30 mm are possible. Here, however, the length or width is generally always distinctly greater than the diameter.
As materials for the metal wire pieces the most varied substances are possible, with care solely having to be taken that these are resistant to the high temperatures to be expected. Thus, for example, ferritic and austenitic steel, special alloys and the like are conceivable.
13~3~
In the following, a catalytic converter body according to the invention is shown with regard to its principles with reference to the drawing.
The catalytic converter body is produced in the known way by compression-molding and subse~uently sintered, with the shape being selected so that a cylindrical form is created for the catalytic converter body 10.
To reduce the flow resistance the catalytic converter body 10 is formed from a plurality of cylinder segments 1-4 arranged one after the other. The individual molded segments are pressed close to one another and their den-sity ~ decreases in the direction of through-~low from 1 ~4' As basic material-metal chips can be used instead of short metal wire pieces. These are obtained, for example, by punching, turning, planing or milling in widths of 1-5 mm and lengths of 1-20mm, prePerably of 2~3mm and 5-10mm. Here, the width may also change over the length according to the form of cutting operation.
Claims (4)
1. Catalyst for cleaning exhaust gases from combustion engines, comprising a catalyst body (lo) consisting of compression moulded and then sintered metal wire pieces or metal chips and traversed by the exhaust gases, characterised in that the catalyst body (10) is formed by a plurality of moulded segments (1-4) of different densities arranged one behind the other.
2. Catalyst according to claim 1, characterised in that the density of the moulded segments (1-4) decreases in the flow direction of the exhaust gas.
3. Catalyst according to claim 1 or claim 2, characterised in that the metal wire pieces or metal chips have diameters or widths of 0.1 - 5 mm and lengths of 0.5 - 30 mm.
4. Catalyst according to claim 3, characterised in that the metal wire pieces or metal chips have diameters or widths of 1 - 3 mm and lengths of 2 - 10 mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3743503.5 | 1987-12-22 | ||
| DE19873743503 DE3743503A1 (en) | 1987-12-22 | 1987-12-22 | METHOD FOR PRODUCING A CATALYST FOR EXHAUST GAS PURIFICATION AND A CATALYST PRODUCED THEREFORE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1317231C true CA1317231C (en) | 1993-05-04 |
Family
ID=6343245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000586695A Expired - Fee Related CA1317231C (en) | 1987-12-22 | 1988-12-21 | Process for the production of a catalytic converter for exhaust-gas cleaning and catalytic converter produced according to this |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0321761B1 (en) |
| JP (1) | JPH01203042A (en) |
| KR (1) | KR950013323B1 (en) |
| AT (1) | ATE83392T1 (en) |
| CA (1) | CA1317231C (en) |
| DE (2) | DE3743503A1 (en) |
| ES (1) | ES2036659T3 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4024942A1 (en) * | 1990-08-06 | 1992-02-13 | Emitec Emissionstechnologie | MONOLITHIC METAL HONEYCOMB WITH VARIOUS CHANNEL NUMBER |
| DE19815004C1 (en) * | 1997-09-12 | 1999-03-25 | Inst Umwelttechnologie Und Umw | Catalytic purification of flue gases |
| KR20020043091A (en) * | 2000-12-01 | 2002-06-08 | 이계안 | Closed Coupled Converter structure using metal catalystic |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2555038A1 (en) * | 1975-12-06 | 1977-06-23 | Bremshey Ag | IC vehicle engine exhaust purifier - has twin catalysts respectively of noble and non noble metal |
| JPS5490665A (en) * | 1977-11-18 | 1979-07-18 | Texaco Development Corp | Exhaust system smoke filter and its formation method |
-
1987
- 1987-12-22 DE DE19873743503 patent/DE3743503A1/en not_active Withdrawn
-
1988
- 1988-12-03 AT AT88120226T patent/ATE83392T1/en not_active IP Right Cessation
- 1988-12-03 DE DE8888120226T patent/DE3876767D1/en not_active Expired - Fee Related
- 1988-12-03 ES ES198888120226T patent/ES2036659T3/en not_active Expired - Lifetime
- 1988-12-03 EP EP88120226A patent/EP0321761B1/en not_active Expired - Lifetime
- 1988-12-19 KR KR88016947A patent/KR950013323B1/en active IP Right Grant
- 1988-12-20 JP JP63319666A patent/JPH01203042A/en active Pending
- 1988-12-21 CA CA000586695A patent/CA1317231C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR890010399A (en) | 1989-08-08 |
| EP0321761A1 (en) | 1989-06-28 |
| KR950013323B1 (en) | 1995-11-02 |
| EP0321761B1 (en) | 1992-12-16 |
| ATE83392T1 (en) | 1993-01-15 |
| DE3743503A1 (en) | 1989-07-06 |
| DE3876767T (en) | 1993-01-28 |
| ES2036659T3 (en) | 1993-06-01 |
| JPH01203042A (en) | 1989-08-15 |
| DE3876767D1 (en) | 1993-01-28 |
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