FR2913455A3 - Exhaust gas treating device for e.g. oil engine of motor vehicle, has walls made of porous material that ensures condensation of molecules contained in gas for retaining molecules in condensed form, in walls, during passing of gas - Google Patents

Exhaust gas treating device for e.g. oil engine of motor vehicle, has walls made of porous material that ensures condensation of molecules contained in gas for retaining molecules in condensed form, in walls, during passing of gas Download PDF

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Publication number
FR2913455A3
FR2913455A3 FR0753682A FR0753682A FR2913455A3 FR 2913455 A3 FR2913455 A3 FR 2913455A3 FR 0753682 A FR0753682 A FR 0753682A FR 0753682 A FR0753682 A FR 0753682A FR 2913455 A3 FR2913455 A3 FR 2913455A3
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Prior art keywords
walls
gas
treatment device
molecules
exhaust gas
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FR0753682A
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French (fr)
Inventor
Marc Guyon
Erwan Radenac
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Renault SAS
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Renault SAS
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Priority to FR0753682A priority Critical patent/FR2913455A3/en
Publication of FR2913455A3 publication Critical patent/FR2913455A3/en
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Classifications

    • 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
    • F01N3/005—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for draining or otherwise eliminating condensates or moisture accumulating in the apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
    • B01D46/2429—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material of the honeycomb walls or cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/003—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
    • B01D46/24492—Pore diameter
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0226—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being fibrous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/30—Porosity of filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/30—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for treatment of exhaust gases from IC Engines
    • 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
    • F01N2330/06—Ceramic, e.g. monoliths
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/12—Hydrocarbons
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/22—Water or humidity
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Catalysts (AREA)

Abstract

The device (1) has porous walls (3) made of porous material e.g. carbide, silicon nitride, mullite and cordierite, that ensures condensation of water and hydrocarbonated molecules contained in exhaust gas that is traversed via the material, for retaining the molecules in condensed form, in the walls, during passing of gas. The walls define a stack of parallel drain pipes (2) that is alternatively closed and opened at their exhaust gas inlet and outlet ends (2a, 2b).

Description

- 1 - DISPOSITIF DE TRAITEMENT DES GAZ D'ECHAPPEMENT La présente invention- 1 - DEVICE FOR TREATING EXHAUST GAS The present invention

se rapporte au domaine du traitement des gaz d'échappement, notamment de moteurs 5 à combustion. Elle trouve une application privilégiée, mais non exclusive, sur les lignes d'échappement de véhicules équipés de moteurs thermiques, Diesel ou non. Les gaz d'échappement renferment un grand nombre 10 de molécules, parmi lesquelles des composés inertes, tels que l'azote, l'oxygène, ou l'eau sous forme de vapeur, du dioxyde de carbone, et des polluants , tels que les oxydes d'azote, des particules , du monoxyde de carbone, et des hydrocarbures. 15 Les hydrocarbures, issus de la combustion incomplète du carburant, se répartissent en deux familles principales : une première famille exclusivement composée de carbone et d'oxygène (CxHy), et une deuxième famille de la forme (CxHyOz), contenant 20 en plus, des atomes d'oxygène. Les hydrocarbures sont normalement traités par un catalyseur d'oxydation, disposé à cette fin, dans la ligne d'échappement. Toutefois, certaines catégories de molécules, en particulier à chaîne carbonée courte 25 (conventionnellement nombre d'atomes de carbone inférieur à quatre), sont peu ou mal traitées par les catalyseurs d'oxydation usuels à basse température, c'est-à-dire lors du démarrage du véhicule, en particulier en hiver. 30 En l'absence de mesures particulières, on retrouve donc à l'échappement certains hydrocarbures, notamment des hydrocarbures à chaîne carbonée courte, oxygénés ou non, et de la vapeur d'eau. - 2 - Les hydrocarbures oxygénés génèrent des odeurs désagréables, et sont toxiques. Le mélange des hydrocarbures non oxygénés et de la vapeur d'eau, génère des fumées blanches, caractéristiques.  relates to the field of exhaust gas treatment, including combustion engines. It finds a preferred application, but not exclusive, on the exhaust lines of vehicles equipped with thermal engines, diesel or not. The exhaust gases contain a large number of molecules, including inert compounds, such as nitrogen, oxygen, or water vapor, carbon dioxide, and pollutants, such as nitrogen oxides, particulates, carbon monoxide, and hydrocarbons. The hydrocarbons, resulting from the incomplete combustion of the fuel, are divided into two main families: a first family exclusively composed of carbon and oxygen (CxHy), and a second family of the form (CxHyOz), containing in addition, oxygen atoms. The hydrocarbons are normally treated with an oxidation catalyst, arranged for this purpose, in the exhaust line. However, certain classes of molecules, in particular with a short carbon chain (conventionally fewer than four carbon atoms), are poorly or poorly treated by conventional oxidation catalysts at low temperature, that is to say when starting the vehicle, especially in winter. In the absence of any particular measures, the exhaust therefore contains certain hydrocarbons, in particular hydrocarbons with a short carbon chain, oxygenated or not, and water vapor. - 2 - Oxygenated hydrocarbons generate unpleasant odors, and are toxic. The mixture of non-oxygenated hydrocarbons and water vapor generates characteristic white smoke.

L'émission des hydrocarbures en sortie du moteur, peut être limitée par des réglages moteur appropriés. Toutefois, de tels réglages sont vite pénalisants pour les performances du moteur, et limitent les marges de réglage d'autres paramètres. On a ainsi constaté que des réglages privilégiant la diminution des hydrocarbures rejetés par le moteur, conduisaient à une augmentation du bruit de combustion perçu dans l'habitacle, à une augmentation de la consommation de carburant, ou à l'accentuation des émissions d'autres types de polluants, tels que les oxydes d'azote. Par la publication WO2004065529, on connaît l'utilisation d'un oxyde de Cérium en tant qu'additif pour carburant. Selon cette publication, le Cérium agit alors comme catalyseur, pour éliminer les émissions de gaz toxiques et réduire les émissions de particules par les automobiles. Une telle mesure permet de réduire les émissions de fumées. Toutefois, elle présente l'inconvénient de faire appel à un agent actif spécifique, qui doit être dosé, pour maîtriser les réactions souhaitées. La présente invention vise à réduire les émissions de fumées blanches d'un véhicule, sans ajout d'agent chimique. Dans ce but, elle propose que les gaz d'échappement traversent un matériau poreux favorisant la condensation de certains composants du gaz, de manière à retenir ces composants sous forme condensée, au passage des gaz.  The emission of hydrocarbons at the output of the engine can be limited by appropriate engine settings. However, such adjustments are quickly detrimental to the performance of the engine, and limit the adjustment margins of other parameters. It has thus been found that adjustments favoring the reduction of hydrocarbons discharged by the engine, lead to an increase in the perceived combustion noise in the passenger compartment, to an increase in fuel consumption, or to the increase in emissions of others. types of pollutants, such as nitrogen oxides. Publication WO2004065529 discloses the use of a cerium oxide as a fuel additive. According to this publication, cerium acts as a catalyst, to eliminate emissions of toxic gases and reduce particulate emissions by automobiles. Such a measure makes it possible to reduce smoke emissions. However, it has the disadvantage of using a specific active agent, which must be measured, to control the desired reactions. The present invention aims to reduce the emissions of white smoke from a vehicle, without adding a chemical agent. For this purpose, it proposes that the exhaust gases pass through a porous material promoting the condensation of certain components of the gas, so as to retain these components in condensed form, as the gases pass.

Conformément a l'invention, les pores du matériau sont dimensionnés pour favoriser la condensation des molécules d'eau et/ou de molécules hydrocarbonées contenues dans les gaz d'échappement.  According to the invention, the pores of the material are sized to promote the condensation of water molecules and / or hydrocarbon molecules contained in the exhaust gas.

De préférence, les gaz traversent des parois poreuses s'étendent sensiblement dans la direction principale d'écoulement des gaz. La présente invention sera mieux comprise à la lecture de la description suivante, d'un mode de réalisation non limitatif de celle-ci, en se reportant aux dessins annexés, sur lesquels : - les figures 1, 2 et 3, illustrent trois variantes de réalisation de celle-ci. Le dispositif de traitement des gaz d'échappement 1 illustré par la figure 1 se présente sous la forme d'un empilement de canaux d'écoulement parallèles 2, fermés alternativement à leurs extrémités d'entrée 2a, et de sortie 2b, des gaz. Les canaux 2 sont délimités par des parois parallèles 3 en matériau poreux. Le matériau poreux est choisi pour que les gaz d'échappement le traversent tout en favorisant au passage la condensation de certains composants, de manière à les retenir sous forme condensée dans les parois 3.  Preferably, the gases passing through porous walls extend substantially in the main flow direction of the gases. The present invention will be better understood on reading the following description of a nonlimiting embodiment thereof, with reference to the accompanying drawings, in which: FIGS. 1, 2 and 3 illustrate three variants of FIG. realization of it. The exhaust gas treatment device 1 illustrated in Figure 1 is in the form of a stack of parallel flow channels 2, closed alternately at their inlet ends 2a, and outlet 2b, gases. The channels 2 are delimited by parallel walls 3 of porous material. The porous material is chosen so that the exhaust gases pass through it while promoting the condensation of certain components in passing, so as to retain them in condensed form in the walls 3.

Le dispositif 1 est disposé, de préférence, mais non impérativement, en arrière des autres unités de traitement (catalyseur d'oxydation, filtre à particules, système de traitement des oxydes d'azote, etc.) d'une ligne d'échappement 4, dans le sens d'écoulement des gaz. Il vise à épurer ces derniers de certains composants toxiques, non traités par les autres unités de traitement de la ligne d'échappement. A cette fin, le matériau poreux constituant les parois 3, peut être - 4 - par exemple un carbure ou un nitrure de silicium, une Mullite, une Cordiérite, ou tout autre matériau, notamment les matériaux de la famille des céramiques, favorisant la condensation de certains composants du gaz, de manière à les retenir sous forme condensée, dans les parois. L'objectif recherché est d'épurer les gaz d'échappement des fumées blanches toxiques composées principalement de vapeur d'eau et d'hydrocarbures. Les pores du matériau sont dimensionnés pour favoriser la condensation des molécules d'eau et/ou de petites molécules hydrocarbonées contenues dans les gaz d'échappement. Ces molécules vont donc rester stockées dans les parois, sans toutefois empêcher le passage des autres composants. La taille des pores doit donc être appropriée. On a ainsi constaté qu'avec les matériaux cités, l'optimum de taille pour favoriser la condensation de ces molécules, est compris entre 5 et 35 microns.  The device 1 is preferably, but not necessarily, placed behind the other treatment units (oxidation catalyst, particulate filter, nitrogen oxide treatment system, etc.) of an exhaust line 4. , in the direction of gas flow. It aims to purify the latter of certain toxic components, not treated by the other units of treatment of the exhaust line. For this purpose, the porous material constituting the walls 3 may be, for example, a silicon carbide or nitride, a Mullite, a Cordierite, or any other material, in particular the materials of the ceramic family, favoring condensation. certain components of the gas, so as to retain them in condensed form in the walls. The objective is to purify the exhaust gases of toxic white fumes composed mainly of water vapor and hydrocarbons. The pores of the material are sized to promote the condensation of water molecules and / or small hydrocarbon molecules contained in the exhaust gas. These molecules will therefore remain stored in the walls, without however preventing the passage of the other components. The pore size must be appropriate. It has thus been found that with the cited materials, the optimum size for promoting the condensation of these molecules is between 5 and 35 microns.

Toutefois, il est possible de s'écarter de cette plage de valeurs, sans sortir du cadre de l'invention, si la nature du matériau utilisé le justifie. A titre d'exemple, avec une densité de cellules de 20 à 63 cellules par inch au carré, on a réalisé un dispositif particulièrement performant, avec une porosité comprise entre 22 et 78%. Comme indiqué sur les schémas, les gaz traversent les parois poreuses 3 s'étendant de préférence sensiblement dans la direction principale d'écoulement des gaz. Les parois définissent un empilement de canaux d'écoulement parallèles 2. En respectant ce principe, un grand nombre d'architectures sont réalisables. Les canaux peuvent par exemple être - 5 - fermés alternativement à leurs extrémités d'entrée 2a et de sortie 2b des gaz, comme sur la figure 1. Ils peuvent également être ouverts à leurs deux extrémités, comme sur la figure 2, ou être alternativement fermés et ouverts à leurs extrémités d'entrée des gaz, conformément à la figure 3. D'autres variantes de ces dispositions sont également réalisables, sans sortir du cadre de l'invention. En conclusion, il faut rappeler que l'épuration des gaz d'échappement obtenue grâce à l'invention est réalisée par une action strictement physique (phénomène de condensation), sans intervention d'agents chimiques. En particulier, elle ne nécessite aucun dosage d'additif.15  However, it is possible to deviate from this range of values, without departing from the scope of the invention, if the nature of the material used justifies it. By way of example, with a cell density of 20 to 63 cells per square inch, a particularly powerful device has been realized, with a porosity of between 22 and 78%. As shown in the drawings, the gases pass through the porous walls 3 preferably extending substantially in the main flow direction of the gases. The walls define a stack of parallel flow channels 2. By respecting this principle, a large number of architectures are feasible. The channels may for example be closed alternately at their inlet ends 2a and at the outlet 2b of the gases, as in FIG. 1. They may also be open at their two ends, as in FIG. 2, or alternatively closed and open at their gas inlet ends, in accordance with Figure 3. Other variations of these provisions are also feasible, without departing from the scope of the invention. In conclusion, it should be remembered that the purification of the exhaust gas obtained by virtue of the invention is achieved by a strictly physical action (condensation phenomenon), without the intervention of chemical agents. In particular, it does not require any additive dosage.

Claims (10)

REVENDICATIONS 1. Dispositif de traitement des gaz d'échappement (1), d'un moteur à combustion, caractérisé en ce que les gaz d'échappement traversent un matériau poreux favorisant la condensation de certains composants du gaz de manière à retenir ces composants sous forme condensée au passage des gaz.  An exhaust gas treatment device (1) for a combustion engine, characterized in that the exhaust gases pass through a porous material which promotes the condensation of certain components of the gas so as to retain these components in the form of condensed to the passage of gases. 2. Dispositif de traitement (1) selon la revendication 1, caractérisé en ce que les pores du matériau sont dimensionnés pour favoriser la condensation des molécules d'eau et/ou de molécules hydrocarbonées contenues dans lez gaz d'échappement.  2. Treatment device (1) according to claim 1, characterized in that the pores of the material are sized to promote the condensation of water molecules and / or hydrocarbon molecules contained in the exhaust gas. 3. Dispositif d'échappement (1) selon la revendication 1 ou 2, caractérisé en ce que les gaz traversent des parois poreuses (3) s'étendant sensiblement dans la direction principale d'écoulement des gaz.  3. Exhaust device (1) according to claim 1 or 2, characterized in that the gases pass through porous walls (3) extending substantially in the main direction of gas flow. 4. Dispositif de traitement (1) selon la revendication 1, 2 ou 3, caractérisé en ce que le matériau poreux est un carbure ou un nitrure de silicium.  4. Treatment device (1) according to claim 1, 2 or 3, characterized in that the porous material is a silicon carbide or nitride. 5. Dispositif de traitement (1) selon la revendication 1, 2 ou 3, caractérisé en ce que le 25 matériau est une Mullite ou une Cordiérite.  5. Treatment device (1) according to claim 1, 2 or 3, characterized in that the material is a Mullite or a Cordierite. 6. Dispositif de traitement (1) selon l'une des revendications précédentes, caractérisé en ce que la taille des pores est comprise entre 5 et 35 microns.  6. Treatment device (1) according to one of the preceding claims, characterized in that the pore size is between 5 and 35 microns. 7. Dispositif de traitement (1) selon l'une des 30 revendications 3 à 6, caractérisé en ce que les parois définissent un empilement de canaux d'écoulement (2) parallèles ouverts à leurs deux extrémités (2a, 2b).- 7 -  7. Treatment device (1) according to one of claims 3 to 6, characterized in that the walls define a stack of parallel flow channels (2) open at both ends (2a, 2b). - 8. Dispositif de traitement (1) selon l'une des revendications 3 à 7, caractérisé en ce que les parois (3) définissent un empilement de canaux d'écoulement parallèles (2) alternativement fermés et ouverts à leurs extrémités d'entrée (2a) des gaz.  8. Treatment device (1) according to one of claims 3 to 7, characterized in that the walls (3) define a stack of parallel flow channels (2) alternately closed and open at their inlet ends ( 2a) gases. 9. Dispositif de traitement (1) selon l'une des revendications 3 à 7, caractérisé en ce que les parois (2) définissent un empilement de canaux d'écoulement parallèles (2) fermés alternativement à leurs extrémités d'entrée (2a) et de sortie (2b) des gaz.  9. Treatment device (1) according to one of claims 3 to 7, characterized in that the walls (2) define a stack of parallel flow channels (2) alternately closed at their inlet ends (2a). and outputting (2b) gases. 10. Dispositif de traitement (1) selon l'une des revendications précédentes, caractérisé en ce qu'il est disposé en arrière des autres unités de traitement d'une ligne d'échappement (4), dans le sens d'écoulement des gaz.  10. Treatment device (1) according to one of the preceding claims, characterized in that it is arranged behind the other treatment units of an exhaust line (4), in the direction of gas flow .
FR0753682A 2007-03-07 2007-03-07 Exhaust gas treating device for e.g. oil engine of motor vehicle, has walls made of porous material that ensures condensation of molecules contained in gas for retaining molecules in condensed form, in walls, during passing of gas Withdrawn FR2913455A3 (en)

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FR0753682A FR2913455A3 (en) 2007-03-07 2007-03-07 Exhaust gas treating device for e.g. oil engine of motor vehicle, has walls made of porous material that ensures condensation of molecules contained in gas for retaining molecules in condensed form, in walls, during passing of gas

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Publication number Priority date Publication date Assignee Title
DE102012106303A1 (en) * 2012-07-13 2014-01-16 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Gas exhaust system, useful for internal combustion engine of motor vehicle, comprises sensor to detect temperature, gas concentration, air-fuel ratio and oxygen concentration of exhaust gas, and protective elements placed in exhaust line

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US20050031514A1 (en) * 2003-08-05 2005-02-10 Engelhard Corporation Catalyzed SCR filter and emission treatment system
US20050042567A1 (en) * 2003-08-06 2005-02-24 Denso Corporation Catalytic reaction heater

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Publication number Priority date Publication date Assignee Title
US5396764A (en) * 1994-02-14 1995-03-14 Ford Motor Company Spark ignition engine exhaust system
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