WO2004044395A1 - Device for purifying a motor vehicle exhaust gas - Google Patents

Device for purifying a motor vehicle exhaust gas Download PDF

Info

Publication number
WO2004044395A1
WO2004044395A1 PCT/DE2003/002338 DE0302338W WO2004044395A1 WO 2004044395 A1 WO2004044395 A1 WO 2004044395A1 DE 0302338 W DE0302338 W DE 0302338W WO 2004044395 A1 WO2004044395 A1 WO 2004044395A1
Authority
WO
WIPO (PCT)
Prior art keywords
storage
region
exhaust gas
motor vehicle
filter
Prior art date
Application number
PCT/DE2003/002338
Other languages
German (de)
French (fr)
Inventor
Markus Widenmeyer
Original Assignee
Robert Bosch Gmbh
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
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2004044395A1 publication Critical patent/WO2004044395A1/en

Links

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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/085—Sulfur or sulfur oxides
    • 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
    • F01N3/0222—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 monolithic, e.g. honeycombs
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0231—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 using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
    • 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
    • F01N3/033—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 in combination with other devices
    • F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/14—Combinations of different methods of purification absorption or adsorption, and filtering
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/065—Surface coverings for exhaust purification, e.g. catalytic reaction for reducing soot ignition temperature

Definitions

  • the invention relates to a device for cleaning exhaust gases from a motor vehicle.
  • the reduction of NO x and particle emissions is a problem when the exhaust gas limit values are reached.
  • a denitrification process based on the effect of a NO x storage catalytic converter is being tested.
  • the nitrogen oxides are generally adsorbed and the adsorbed
  • Nitrogen oxides are periodically reductively desorbed from the storage within short fat phases and implemented on the catalyst.
  • the prior art therefore tries to protect the catalyst from sulfur.
  • One possibility is to eliminate sulfur components in the fuel.
  • residual amounts of more than 5 ppm of sulfur remain in the fuel.
  • a known measure provides for so-called SO x traps to be provided in the exhaust tract in order to protect the NO x storage catalytic converter from sulfur. It has been found expedient to provide a spatial separation between the S0 X - to realize trap and the NO x storage, so that the SO x - containing exhaust gas first comes with the SO x trap in contact. It is also known to use a NO x
  • each line contains a NO x store and an upstream SO x store. It is arranged upstream of the NO x storage catalyst during the SO x -Ein Grandeung the SO x storage.
  • Regeneration is achieved in a reverse order using a flap system.
  • N0 X reduction methods may no longer suffice for future exhaust gas regulations.
  • the installation of post-engine NO x and particle reduction devices may be necessary for these vehicles.
  • Several models, for example catalysts or filters, have to be connected in series in the exhaust line, which is costly and space-intensive and can furthermore lead to high pressure losses in the exhaust line.
  • Catalyst device a particle filter and a heat transfer device.
  • a particle filter body which has or carries an area which is designed for SO x storage.
  • SO x traps or SO x stores preferably contain moderately to strongly basic element oxides, for example their hydroxides, carbonates, such as SrO, CaO, Li 2 O, MgO, Ag 2 O or compounds of the later rare earths as well as Sc and Y.
  • moderately to strongly basic element oxides for example their hydroxides, carbonates, such as SrO, CaO, Li 2 O, MgO, Ag 2 O or compounds of the later rare earths as well as Sc and Y.
  • a second region is optionally additionally provided, which serves as a NO x storage catalytic converter.
  • Embodiments are thus SO x traps integrated in a particle filter provided with a NO x storage catalyst function, the NO x and SO x storage being spatially separated from one another.
  • a NO x storage function and an SO x storage function are combined on a particle filter and the NO x storage catalytic converter is protected against sulfur.
  • the first area which is designed for SO x storage, is expediently arranged upstream of the second area, which serves as a NO x storage catalytic converter.
  • the first region preferably also performs a soot oxidation function.
  • the use of silver and other components that are mobile or fluid at temperatures between 200 ° C and 600 ° C is recommended.
  • Precious metals intended for oxidation This causes an effective oxidation of S0 2 and S0 3 and furthermore an oxidation of NO to N0 2 .
  • Precious metals in particular platinum and other redox-active compounds, such as, for example, vanadium oxides, are advantageously provided for this.
  • the downstream SO x storage function can be additionally modified so that it lowers the burn-off temperature of the soot accumulated on the filter or with a lower the burn-off temperature of the soot accumulated on the filter
  • Catalyst formulation is combined.
  • the combination of soot oxidation and SO x storage function can be achieved by successively coating the catalyst components, by mechanical mixing and subsequent coating, by combining the active components on a washcoat, by generating mixed phases, for example by means of the sol-gel process. or by supporting one component on the other so that one component serves as a washcoat.
  • the device according to the invention can be designed, for example, as a wall flow particle filter or as a foam or depth filter or as a combination of these particle filter types his.
  • filters By combining filters with SO x storage, regeneration of filter and SQ ⁇ storage can be carried out synchronously.
  • the SO x storage is realized in a space-saving manner and spatially separated from the NO x storage catalytic converter on a filter medium. Catalytic material can be used efficiently by using it for SO x storage and soot oxidation.
  • regeneration of the SO x storage and regeneration of the NO x storage can be carried out synchronously.
  • the device according to the invention enables an effective combination of a NO x storage catalytic converter and a soot filter function, in which one
  • Figure 1 shows a preferred embodiment of the device according to the invention in a sectional view.
  • the device shown is designed as a wall flow particle filter 10. This comprises a gas inlet channel 12 and a gas outlet channel 14.
  • the structure of the particle filter 10 is defined by a porous wall 16 which effects the filter effect.
  • the porous wall 16 is coated with a first area 18, which performs the SO x storage function and possibly a soot oxidation function.
  • the porous wall 16 is provided with a second region 20, namely a NO x
  • Storage catalyst coating provided or coated.
  • the exhaust gas flows from above into the gas inflow channel 12, penetrates the first area 18, the porous wall 16 and the second area 20 and finally flows out of the gas outflow channel 14 below.
  • a plurality of gas inlet channels 12 or a plurality of gas outlet channels 14 can be arranged in parallel and next to one another alternately, the gas inlet channels on the upstream side of the filter being open and the gas outlet channels on the downstream side of the filter being open.

Abstract

The invention concerns a device (10) for purifying a motor vehicle exhaust gas. The device comprises a filtering body, a first zone (18) for storing SOx.

Description

Vorrichtung zum Reinigen von Abgasen eines KraftfahrzeugsDevice for cleaning exhaust gases from a motor vehicle
Die Erfindung betrifft eine Vorrichtung zum Reinigen von Abgasen eines Kraftfahrzeugs.The invention relates to a device for cleaning exhaust gases from a motor vehicle.
Stand der TechnikState of the art
Insbesondere bei Dieselkraftfahrzeugen stellt bei der Erreichung der Abgasgrenzwerte die Verminderung von NOx- und Partikelemissionen ein Problem dar. Bei Dieselfahrzeugen wird hierzu bspw. ein auf der Wirkung eines NOx-Speicherkatalysator beruhendes Entstickungsverfahren erprobt. Bei diesem werden die Stickoxide allgemein adsorbiert und die adsorbiertenIn diesel vehicles in particular, the reduction of NO x and particle emissions is a problem when the exhaust gas limit values are reached. For diesel vehicles, for example, a denitrification process based on the effect of a NO x storage catalytic converter is being tested. In this, the nitrogen oxides are generally adsorbed and the adsorbed
Stickoxide periodisch aus dem Speicher innerhalb kurzer Fettphasen reduktiv desorbiert und an dem Katalysator umgesetzt .Nitrogen oxides are periodically reductively desorbed from the storage within short fat phases and implemented on the catalyst.
Problematisch bei NOx-Speicherkatalysatoren ist jedoch deren Anfälligkeit für Schwefeloxide. Diese werden an der Speicherkomponente stärker als Stickoxide adsorbiert und blockieren daher den Zugang der Stickoxide zu den Speicherplätzen. Aus diesem Grunde muß ein schwefelvergifteter Katalysator nach bestimmten Zeiträumen von eingelagertem Schwefel befreit werden. Durch einen solchen Entschwefelungsvorgang kann die Entschwefelung ganz oder teilweise erreicht werden. Diese läuft bei Temperaturen von 400 bis 800 °C und einer Luftzahl von λ < 1 in einem Zeitraum von mehreren Sekunden bis mehreren Minuten ab.However, the problem with NO x storage catalysts is their susceptibility to sulfur oxides. These are more strongly adsorbed on the storage component than nitrogen oxides and therefore block the access of the nitrogen oxides to the storage locations. For this reason, a sulfur-poisoned catalyst can be freed of sulfur after certain periods of time. Desulphurization can be achieved in whole or in part by such a desulfurization process. This takes place at temperatures from 400 to 800 ° C and an air ratio of λ <1 in a period of several seconds to several minutes.
Es ist zu beachten, daß hohe Schwefelkonzentrationen im Abgas und hohe Abgastemperaturen das Wachstum vonIt should be noted that high sulfur concentrations in the exhaust gas and high exhaust gas temperatures prevent the growth of
Metallsulfatkristallen aus den Aktivkomponenten (bspw. Ba, Sr) fördern. Dadurch erhöht sich die Gefahr, daß der Katalysator nicht mehr vollständig entschwefelt werden kann. Daher ist es notwendig, höhere Regenerationstemperaturen einzusetzen. Sowohl sehr hohe Entschwefelungstemperaturen als auch eine unvollständige Entschwefelung können aber zu irreversiblen Aktivitätsverlusten des Katalysators führen.Promote metal sulfate crystals from the active components (e.g. Ba, Sr). This increases the risk that the catalyst can no longer be completely desulfurized. It is therefore necessary to use higher regeneration temperatures. However, both very high desulfurization temperatures and incomplete desulfurization can lead to irreversible loss of activity in the catalyst.
Deshalb wird nach dem Stand der Technik versucht, den Katalysator vor Schwefel zu schützen. Eine Möglichkeit besteht darin, Schwefelbestandteile in dem Kraftstoff zu eliminieren. Allerdings bleiben dabei bislang Restmengen an Schwefel von mehr als 5 ppm in dem Kraftstoff vorhanden. Außerdem beginnt derzeit bei Schwefelgehalten desThe prior art therefore tries to protect the catalyst from sulfur. One possibility is to eliminate sulfur components in the fuel. However, residual amounts of more than 5 ppm of sulfur remain in the fuel. In addition, the sulfur content of
Kraftstoffs von weniger als 10 ppm der Beitrag des Motoröls zum Schwefelgehalt des Abgases zu überwiegen.Fuel of less than 10 ppm outweigh the contribution of engine oil to the sulfur content of the exhaust gas.
Eine bekannte Maßnahme sieht vor, sogenannte SOx-Fallen in dem Abgastrakt vorzusehen, um den NOx-Speicherkatalysator vor Schwefel zu schützen. Dabei hat es sich als zweckmäßig herausgestellt, eine räumliche Trennung zwischen der S0X- Falle und dem NOx-Speicher zu realisieren, so daß das SOx- haltige Abgas zuerst mit der SOx-Falle in Kontakt kommt. Weiterhin ist es bekannt, eine einen NOx-A known measure provides for so-called SO x traps to be provided in the exhaust tract in order to protect the NO x storage catalytic converter from sulfur. It has been found expedient to provide a spatial separation between the S0 X - to realize trap and the NO x storage, so that the SO x - containing exhaust gas first comes with the SO x trap in contact. It is also known to use a NO x
Speicherkatalysator enthaltende Schicht mit einer Schicht aus SOx-Speichermaterial zu beschichten. Ebenfalls bekannt ist es, eine SOx-Falle stromaufwärts vor einem NOx-Speicher anzuordnen. Bei einer darauf aufbauenden Konstruktion eines Zweistrangsystems enthält jeder Strang einen NOx-Speicher und einen vorgeschalteten SOx-Speicher . Dabei ist während der SOx-Einspeicherung der SOx-Speicher stromaufwärts vor dem NOx-Speicherkatalysator angeordnet. Bei der SOx-To coat storage catalyst containing layer with a layer of SO x storage material. It is also known to arrange a SO x trap upstream of a NO x storage device. In a construction of a two-line system based on this, each line contains a NO x store and an upstream SO x store. It is arranged upstream of the NO x storage catalyst during the SO x -Einspeicherung the SO x storage. With the SO x -
Regeneration wird über ein Klappensystem eine umgekehrte Reihenfolge verwirklicht.Regeneration is achieved in a reverse order using a flap system.
Für zukünftige Abgasreglementierungen reichen ggf. N0X- Minderungsverfahren nicht mehr aus. Für diese Fahrzeuge kann die Installation von nachmotorischen NOx- und Partikelminderungsvorrichtungen notwendig werden. Dabei müssen mehrere Modelle, bspw. Katalysatoren oder Filter, in dem Abgasstrang hintereinander geschaltet werden, was kosten- und platzintensiv ist und weiterhin zu hohen Druckverlusten in dem Abgasstrang führen kann.N0 X reduction methods may no longer suffice for future exhaust gas regulations. The installation of post-engine NO x and particle reduction devices may be necessary for these vehicles. Several models, for example catalysts or filters, have to be connected in series in the exhaust line, which is costly and space-intensive and can furthermore lead to high pressure losses in the exhaust line.
Es hat sich gezeigt, daß ein Modul, das mehrere Komponenten in sich vereinigt, bspw. Partikel und NOx- Minderungssysteme, den Vorteil hat, Kosten und Raum einzusparen. Gleichzeitig wird hohen Druckverlusten in dem Abgasstrang entgegenwirkt.It has been shown that a module which combines several components, for example particles and NO x reduction systems, has the advantage of saving costs and space. At the same time, high pressure losses in the exhaust system are counteracted.
Es sind bereits derartige Systeme bekannt, die ein Partikelfilter und einen NOx-Sρeicherkatalysator enthalten. Bei diesen ist vorteilhaft, daß simultan eine NOx- Speicherdesulfatierung und eine Partikelfilterregeneration stattfinden können. Aus der Druckschrift DE 198 50 757 AI sind ein Verfahren und eine Vorrichtung zur Desulfatierung einer Katalysatoreinrichtung bekannt. Bei dem vorgestellten Verfahren wird die bei einer Regeneration eines Partikelfilters freiwerdende Wärme zur Regeneration der desaktivierten Katalysatoroberfläche verwendet. Die beschriebene Vorrichtung umfaßt eineSystems of this type are already known which contain a particle filter and an NO x storage catalyst. With these it is advantageous that a NO x storage desulfation and a particle filter regeneration can take place simultaneously. A method and a device for desulfating a catalyst device are known from the publication DE 198 50 757 A1. In the method presented, the heat released during the regeneration of a particle filter is used to regenerate the deactivated catalyst surface. The device described comprises a
Katalysatoreinrichtung, einen Partikelfilter und eine Wärmeübertragungseinrichtung.Catalyst device, a particle filter and a heat transfer device.
Vorteile der ErfindungAdvantages of the invention
Demgegenüber ist bei der erfindungsgemäßen Vorrichtung zum Reinigen von Abgasen eines Kraftfahrzeugs ein Partikelfilterkörper vorgesehen, der einen Bereich aufweist bzw. trägt, der zur SOx-Speicherung ausgelegt ist.In contrast, in the device according to the invention for cleaning exhaust gases from a motor vehicle, a particle filter body is provided which has or carries an area which is designed for SO x storage.
SOx-Fallen bzw. SOx-Speicher enthalten vorzugsweise mittelmäßig bis stark basische Elementoxide, bspw. deren Hydroxide, Carbonate, wie SrO, CaO, Li20, MgO, Ag20 oder Verbindungen der späteren Seltenen Erden sowie Sc und Y.SO x traps or SO x stores preferably contain moderately to strongly basic element oxides, for example their hydroxides, carbonates, such as SrO, CaO, Li 2 O, MgO, Ag 2 O or compounds of the later rare earths as well as Sc and Y.
In Ausgestaltung der erfindungsgemäßen Vorrichtung ist optional zusätzlich ein zweiter Bereich vorgesehen, der als NOx-Speicherkatalysator dient. Bei dieser erweitertenIn an embodiment of the device according to the invention, a second region is optionally additionally provided, which serves as a NO x storage catalytic converter. With this extended
Ausführungsform sind somit SOx-Fallen in einem mit einer NOx-Speicherkatalysatorfunktion versehenen Partikelfilter integriert, wobei der NOx- und der SOx-Speicher räumlich voneinander getrennt vorliegen. Somit ist eine NOx- Speicherfunktion und eine SOx-Speicherfunktion auf einem Partikelfilter kombiniert und der NOx-Speicherkatalysator wird vor Schwefel geschützt. Zweckmäßigerweise ist der erste Bereich, der zur SOx- Speicherung ausgelegt ist, stromaufwärts zu dem zweiten Bereich angeordnet, der als NOx-Speicherkatalysator dient.Embodiments are thus SO x traps integrated in a particle filter provided with a NO x storage catalyst function, the NO x and SO x storage being spatially separated from one another. Thus, a NO x storage function and an SO x storage function are combined on a particle filter and the NO x storage catalytic converter is protected against sulfur. The first area, which is designed for SO x storage, is expediently arranged upstream of the second area, which serves as a NO x storage catalytic converter.
Vorzugsweise führt der erste Bereich zusätzlich eine Rußoxidationsfunktion aus. Hierzu empfiehlt sich die Verwendung von Silber und andere bei Temperaturen zwischen 200 °C und 600 °C mobile oder fluide Komponenten.The first region preferably also performs a soot oxidation function. The use of silver and other components that are mobile or fluid at temperatures between 200 ° C and 600 ° C is recommended.
Vorzugsweise sind in dem ersten Bereich zusätzlichPreferably in the first area are additional
Edelmetalle zur Oxidation vorgesehen. Dies bewirkt eine effektive Oxidation von S02 und S03 und weiterhin eine Oxidation von NO zu N02. Hierfür sind vorteilhafterweise Edelmetalle, insbesondere Platin und andere redoxaktive Verbindungen, wie bspw. Vanadiumoxide, vorgesehen.Precious metals intended for oxidation. This causes an effective oxidation of S0 2 and S0 3 and furthermore an oxidation of NO to N0 2 . Precious metals, in particular platinum and other redox-active compounds, such as, for example, vanadium oxides, are advantageously provided for this.
Die stromwärtsangebrachte SOx-Speicherfunktion kann zusätzlich modifiziert werden, so daß diese die Abbrandtemperatur des auf dem Filter angesammelten Rußes senkt oder mit einer die Abbrandtemperatur des auf dem Filter angesammelten Rußes senkendenThe downstream SO x storage function can be additionally modified so that it lowers the burn-off temperature of the soot accumulated on the filter or with a lower the burn-off temperature of the soot accumulated on the filter
Katalysatorformulierung kombiniert wird. Die Kombination von Rußoxidations- und SOx-Speicher-Funktion kann dabei durch sukzessives Beschichten der Katalysatorkomponenten, durch mechanisches Mischen und anschließende Beschichtung, durch Vereinigung der aktiven Komponenten auf einem Washcoat, durch Erzeugung von Mischphasen, bspw. durch Sol- Gel-Verfahren, oder durch Trägern der einen Komponente auf der anderen, so daß eine Komponente als Washcoat dient, verwirklicht werden.Catalyst formulation is combined. The combination of soot oxidation and SO x storage function can be achieved by successively coating the catalyst components, by mechanical mixing and subsequent coating, by combining the active components on a washcoat, by generating mixed phases, for example by means of the sol-gel process. or by supporting one component on the other so that one component serves as a washcoat.
Die erfindungsgemäße Vorrichtung kann bspw. als Wandfluß- Partikelfilter oder als Schaum- bzw. Tiefenfilter oder als eine Kombination dieser Partikelfiltertypen ausgebildet sein. Durch Kombination von Filter mit SOx-Speicher können Regeneration von Filter und SQχ-Speicher synchron durchgeführt werden. Ferner wird der SOx-Speicher platzsparend und räumlich vom NOx-Speicherkatalysator getrennt auf einem Filtermedium verwirklicht. Katalytisches Material kann effizient verwendet werden, indem es für SOx- Speicherung und Rußoxidation eingesetzt wird.The device according to the invention can be designed, for example, as a wall flow particle filter or as a foam or depth filter or as a combination of these particle filter types his. By combining filters with SO x storage, regeneration of filter and SQχ storage can be carried out synchronously. Furthermore, the SO x storage is realized in a space-saving manner and spatially separated from the NO x storage catalytic converter on a filter medium. Catalytic material can be used efficiently by using it for SO x storage and soot oxidation.
In erweiterter Form können Regeneration des SOx-Speichers und die Regeneration des NOx-Speichers synchron durchgeführt werden.In an expanded form, regeneration of the SO x storage and regeneration of the NO x storage can be carried out synchronously.
Die erfindungsgemäße Vorrichtung ermöglicht eine wirkungsvolle Kombination eines NOx-Speicherkatalysator und einer Rußfilterfunktion, bei der eine dieThe device according to the invention enables an effective combination of a NO x storage catalytic converter and a soot filter function, in which one
Langzeitfunktionsfähigkeit des NOx-Speicherkatalysators verbessernde SOx-Falle integriert ist.Long-term functionality of the NO x storage catalyst-improving SO x trap is integrated.
Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous embodiments of the invention result from the subclaims.
Weitere Vorteile und Ausgestaltungen der Erfindung ergeben sich aus der Beschreibung und der beiliegenden Zeichnung.Further advantages and refinements of the invention result from the description and the attached drawing.
Es versteht sich, daß die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen. ZeichnungIt goes without saying that the features mentioned above and those yet to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own without departing from the scope of the present invention. drawing
Die Erfindung ist anhand eines Ausführungsbeispiels in derThe invention is based on an embodiment in the
Zeichnung schematisch dargestellt und wird im folgenden unter Bezugnahme auf die Zeichnung ausführlich beschrieben.Drawing is shown schematically and is described in detail below with reference to the drawing.
Figur 1 zeigt eine bevorzugte Ausführungsform der erfindungsgemäßen Vorrichtung in einer Schnittansicht.Figure 1 shows a preferred embodiment of the device according to the invention in a sectional view.
Die dargestellte Vorrichtung ist als ein Wandfluß- Partikelfilter 10 ausgebildet. Dieses umfaßt einen Gaszuflußkanal 12 und einen Gasabflußkanal 14. Dabei wird der Aufbau des Partikelfilters 10 durch eine poröse Wand 16 definiert, die die Filterwirkung bewirkt.The device shown is designed as a wall flow particle filter 10. This comprises a gas inlet channel 12 and a gas outlet channel 14. The structure of the particle filter 10 is defined by a porous wall 16 which effects the filter effect.
Im Bereich des Gaszuflußkanals 12 ist die poröse Wand 16 mit einem ersten Bereich 18 beschichtet, der die SOx~ Speicherfunktion und ggf. eine Rußoxidationsfunktion ausführt. In dem Gasabflußkanal 14 ist die poröse Wand 16 mit einem zweiten Bereich 20, nämlich einer NOx-In the area of the gas inflow channel 12, the porous wall 16 is coated with a first area 18, which performs the SO x storage function and possibly a soot oxidation function. In the gas discharge duct 14, the porous wall 16 is provided with a second region 20, namely a NO x
Speicherkatalysatorbeschichtung, versehen bzw. beschichtet.Storage catalyst coating, provided or coated.
Im Betrieb strömt das Abgas von oben in den Gaszuflußkanal 12, durchdringt den ersten Bereich 18, die poröse Wand 16 und den zweiten Bereich 20 und strömt abschließend unten aus dem Gasabflußkanal 14 aus.In operation, the exhaust gas flows from above into the gas inflow channel 12, penetrates the first area 18, the porous wall 16 and the second area 20 and finally flows out of the gas outflow channel 14 below.
Hierbei können mehrere Gaszuflusskanäle 12 bzw. mehrere Gasabflusskanäle 14 parallel und nebeneinander wechselweise angeordnet sind, wobei die Gaszuflusskanäle auf der stromaufwärtigen Seite des Filters offen sind und die Gasabflusskanäle auf der stomabwärtigen Seite des Filters offen sind. Here, a plurality of gas inlet channels 12 or a plurality of gas outlet channels 14 can be arranged in parallel and next to one another alternately, the gas inlet channels on the upstream side of the filter being open and the gas outlet channels on the downstream side of the filter being open.

Claims

Ansprüche Expectations
1. Vorrichtung zum Reinigen von Abgasen eines1. Device for cleaning exhaust gases
Kraftfahrzeugs mit einem Filterkörper, bei dem ein erster Bereich (18) vorgesehen ist, der zur SOx-Speicherung ausgelegt ist.Motor vehicle with a filter body, in which a first area (18) is provided, which is designed for SO x storage.
2. Vorrichtung nach Anspruch 1, bei der zusätzlich ein zweiter Bereich (20) vorgesehen ist, der als NOx- Speicherkatalysator dient.2. Device according to claim 1, in which a second region (20) is additionally provided, which serves as a NO x storage catalytic converter.
3. Vorrichtung nach Anspruch 2, bei der der erste Bereich (18) stromaufwärts zu dem zweiten Bereich (20) angeordnet ist .3. The apparatus of claim 2, wherein the first region (18) is arranged upstream of the second region (20).
4. Vorrichtung nach einem der Ansprüche 1 bis 3, bei der der erste Bereich (18) zusätzlich eine Rußoxidationsfunktion ausführt.4. Device according to one of claims 1 to 3, wherein the first region (18) additionally performs a soot oxidation function.
5. Vorrichtung nach einem der Ansprüche 2 bis 4, die einen Gaszuflußkanal (12) und einen Gasabflußkanal (14) aufweist, wobei in dem Gaszuflußkanal (12) der erste Bereich (18) und in dem Gasabflußkanal (14) der zweite Bereich (20) vorgesehen ist. 5. Device according to one of claims 2 to 4, which has a gas inlet channel (12) and a gas outlet channel (14), wherein in the gas inlet channel (12) the first region (18) and in the gas outlet channel (14) the second region (20th ) is provided.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, bei dem in dem ersten Bereich (18) Edelmetalle zur Oxidation vorgesehen sind.6. Device according to one of claims 1 to 5, in which noble metals are provided for oxidation in the first region (18).
7. Vorrichtung nach einem der Ansprüche 1 bis 6, die als7. Device according to one of claims 1 to 6, which as
Wand-Fluß-Partikelfilter (10) ausgebildet ist.Wall-flow particle filter (10) is formed.
8. Vorrichtung nach einem der Ansprüche 1 bis 6, die als Tiefenfilter ausgebildet ist. 8. Device according to one of claims 1 to 6, which is designed as a depth filter.
PCT/DE2003/002338 2002-11-13 2003-07-11 Device for purifying a motor vehicle exhaust gas WO2004044395A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002152733 DE10252733A1 (en) 2002-11-13 2002-11-13 Device for purifying vehicle exhaust gases used in diesel engines comprises a filter body having a region for sulfur oxides storage
DE10252733.4 2002-11-13

Publications (1)

Publication Number Publication Date
WO2004044395A1 true WO2004044395A1 (en) 2004-05-27

Family

ID=32185578

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/002338 WO2004044395A1 (en) 2002-11-13 2003-07-11 Device for purifying a motor vehicle exhaust gas

Country Status (2)

Country Link
DE (1) DE10252733A1 (en)
WO (1) WO2004044395A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005029799A1 (en) * 2005-06-27 2007-01-11 Volkswagen Ag Cleaner for motor vehicle internal combustion engine has particle filter and more remote nitrogen oxide storage catalyst of lower functional thermal capability
DE102017103341A1 (en) * 2017-02-17 2018-08-23 Umicore Ag & Co. Kg RUSSIAN PARTICLE FILTER WITH MEMORY CELLS FOR CATALYST

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989003720A1 (en) * 1987-10-23 1989-05-05 Massachusetts Institute Of Technology Methods and devices for gas cleaning
FR2819549A1 (en) * 2001-01-12 2002-07-19 Renault I.C. engine exhaust gas treatment system has particle filter in main exhaust pipe downstream of sulfur oxide trap
GB2375058A (en) * 2001-03-29 2002-11-06 Daimler Chrysler Ag Exhaust gas particle filter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989003720A1 (en) * 1987-10-23 1989-05-05 Massachusetts Institute Of Technology Methods and devices for gas cleaning
FR2819549A1 (en) * 2001-01-12 2002-07-19 Renault I.C. engine exhaust gas treatment system has particle filter in main exhaust pipe downstream of sulfur oxide trap
GB2375058A (en) * 2001-03-29 2002-11-06 Daimler Chrysler Ag Exhaust gas particle filter

Also Published As

Publication number Publication date
DE10252733A1 (en) 2004-05-27

Similar Documents

Publication Publication Date Title
DE60020070T2 (en) CATALYTIC HATCH FILTER WITH POROUS WALLS
EP1961933B1 (en) Catalytically activated diesel particulate filter with ammoniac blocking action
DE102011050788A1 (en) Exhaust gas aftertreatment device and method for a gasoline engine
EP2322773B1 (en) Method for cleaning combustion engine exhaust gases
EP3498993A1 (en) Combination of a zeolite based scr with a manganese-based scr in bypass
EP2597279B1 (en) Method and device for cleaning diesel engine exhaust gases
EP3357558B1 (en) Catalyst for cleaning diesel engine exhaust gases
DE19923781A1 (en) Method and device for removing soot from the exhaust gas of a diesel engine
DE102016119586A1 (en) DIAGNOSIS OXIDATION CATALYST DEVICE WITH HYDROCARBON STORAGE
EP2674584B2 (en) Use of an oxidation catalyst for preventing the contamination of an SCR catalyst with platinum
EP2826971A1 (en) Method for reducing nitrogen oxides in diesel engine exhaust gases and exhaust gas treatment system for carrying out the method
DE102009014458A1 (en) Exhaust gas purification device
DE102010021589A1 (en) aftertreatment system
EP2931405A1 (en) CATALYST SYSTEM FOR TREATING NOx- AND PARTICLE-CONTAINING DIESEL EXHAUST GAS
WO2000070202A1 (en) Method for reducing harmful components in the exhaust gas of an internal combustion engine, especially a diesel-internal combustion engine
DE102015212788A1 (en) Catalytically active particle filter
EP1433519B1 (en) Method for producing a particle filter with NOx storage function
DE102016123565A1 (en) DOUBLE-LAYER CATALYST
DE60212245T3 (en) Method and device for removing soot particles from the exhaust gas of a diesel engine
EP3490693B1 (en) Catalyst for reducing nitrogen oxides
DE102012209852A1 (en) Exhaust gas purification system for arrangement in exhaust section of exhaust gas system of diesel internal combustion engine in motor vehicle, has input-oxidation catalyzer for oxidation of hydrocarbons and carbon monoxide
WO2004044395A1 (en) Device for purifying a motor vehicle exhaust gas
WO2009000667A2 (en) Catalyst element, catalyst for the after-treatment of the exhaust gas of an internal combustion engine, and method for producing said catalyst element
AT504391B1 (en) COMBINED EXHAUST GAS CLEANING SYSTEM
DE102009022914B4 (en) Exhaust gas purification device for internal combustion engine

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP