DE10243488A1 - Purification of exhaust gas from internal combustion engine, especially diesel engine, by oxidizing trapped soot particles with nitrogen dioxide obtained by oxidizing monoxide is followed by reduction of excess dioxide - Google Patents
Purification of exhaust gas from internal combustion engine, especially diesel engine, by oxidizing trapped soot particles with nitrogen dioxide obtained by oxidizing monoxide is followed by reduction of excess dioxide Download PDFInfo
- Publication number
- DE10243488A1 DE10243488A1 DE2002143488 DE10243488A DE10243488A1 DE 10243488 A1 DE10243488 A1 DE 10243488A1 DE 2002143488 DE2002143488 DE 2002143488 DE 10243488 A DE10243488 A DE 10243488A DE 10243488 A1 DE10243488 A1 DE 10243488A1
- Authority
- DE
- Germany
- Prior art keywords
- exhaust gas
- nitrogen dioxide
- soot particles
- gas stream
- contained
- 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.)
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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
- F01N3/02—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
-
- 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
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Entfernen von Rußpartikeln aus dem Abgasstrom einer Brennkraftmaschine,
- – wobei in einem ersten Schritt in dem Abgasstrom enthaltenes Stickstoffmonoxid (NO) zu Stickstoffdioxid (NO2) oxidiert wird, so dass der Abgasstrom anschließend Stickstoffdioxid enthält.
- – wobei in einem weiteren Schritt im Abgasstrom enthaltene Rußpartikel gesammelt werden und
- – wobei das in dem Abgasstrom durch die genannte Oxidation enthaltene Stickstoffdioxid zum Oxidieren der gesammelten Rußpartikel durch Reduzieren des Stickstoffdioxids zu Stickstoffmonoxids eingesetzt und diese Oxidation mit einem Stickstoffdioxid-Überschuss durchgeführt wird.
- - In a first step, nitrogen monoxide (NO) contained in the exhaust gas stream is oxidized to nitrogen dioxide (NO 2 ), so that the exhaust gas stream subsequently contains nitrogen dioxide.
- - Wherein soot particles contained in the exhaust gas stream are collected and
- - The nitrogen dioxide contained in the exhaust gas stream by said oxidation is used to oxidize the soot particles collected by reducing the nitrogen dioxide to nitrogen monoxide and this oxidation is carried out with an excess of nitrogen dioxide.
Ferner betrifft die Erfindung eine passive Abgasreinigungseinrichtung zum Entfernen von Rußpartikeln aus dem Abgasstrom einer Brennkraftmaschine, insbesondere einer Dieselbrennkraftmaschine mit einem in dem Abgasstrang der Brennkraftmaschine angeordneten Oxidationskatalysator zum Oxidieren von im Abgas enthaltenen Stickstoffmonoxid zu Stickstoffdioxid und einem dem Oxidationskatalysator in Strömungsrichtung des Abgases nachgeschalteten Partikelfilter zum Herausfiltern von im Abgas enthaltenen Rußpartikeln.The invention further relates to a passive exhaust gas cleaning device for removing soot particles from the exhaust gas flow of an internal combustion engine, in particular one Diesel engine with one in the exhaust line of the engine arranged oxidation catalyst for oxidizing contained in the exhaust gas Nitrogen monoxide to nitrogen dioxide and one of the oxidation catalyst in the direction of flow of the exhaust gas downstream particle filter for filtering out soot particles contained in the exhaust gas.
Zum Reinigen der Abgase einer Brennkraftmaschine, insbesondere einer Dieselbrennkraftmaschine sind unterschiedliche Verfahren bekannt geworden. Unterschiedliche Verfahren führen auch zu einem unterschiedlichen Reinigungsergebnis. Zu unterscheiden ist bei diesen Verfahren zwischen aktiven Reinigungsverfahren, bei denen eine aktive Prozesssteuerung in Abhängigkeit von bestimmten überwachten Kriterien erfolgt, wobei zusätzlich benötigte Energie kontrolliert eingekoppelt wird, und passiven Systemen, die ohne eine aktive Steuerung betrieben werden. Letztere sind aufgrund der nicht benötigten Steuerglieder und aktive Komponenten, beispielsweise Heizungen oder Brenner, naturgemäß einfacher aufgebaut als aktive Abgasreinigungssysteme. Ein seit vielen Jahren eingesetztes passives Abgasreinigungssystem ist das sogenannten CRT-System (continous regenerating trap) zum Entfernen von Rußpartikeln aus dem Abgasstrom. Bei diesem System wird das im Abgasstrom enthaltene Stickstoffmonoxid (NO) zunächst an einem Oxidationskatalysator zu Stickstoffdioxid (NO2) oxidiert. Dieses NO2 wird erzeugt, um ein Oxidationsmittel bereitzustellen, mit dem Rußpartikel oxidiert und somit verbrannt werden können. Zu diesem Zweck ist dem Oxidationskatalysator zum Erzeugen des für die Rußoxidation benötigten NO2 ein Partikelfilter zum Herausfiltern der Rußpartikel aus dem Abgas-strom in Strömungsrichtung des Abgases dem Oxidationskatalysator nachgeschaltet. Die sich auf der anströmseitigen Oberfläche des Partikelfilters akkumulierenden Rußpartikel werden bei diesem Verfahren kontinuierlich durch das auf die Rußpartikel auftreffende NO2 oxidiert, wobei die kohlenstoffhaltigen Rußpartikel im wesentlichen zu Kohlendioxid und Wasser umgewandelt werden. Bei diesem Oxidationsprozess wird das als Oxidationsmittel eingesetzte NO2 zu NO reduziert. Damit auch bei unterschiedlichen Betriebssituationen in jedem Fall ausreichend NO2 im Abgasstrom zum Bewirken der gewünschten Rußpartikeloxidation vorhanden ist, muss dieses Verfahren mit einem NO2-Überschuss betrieben werden. Dies hat zur Folge, dass zwangsläufig nicht reduziertes NO2 an die Umgebung abgegeben wird. Dies ist unerwünscht, da NO2 giftiger ist als NO. Bereits in geringen Konzentrationen macht sich NO2 durch einen Chlorgeruch bemerkbar. Zwar ist das bei Einsatz eines solchen Systems an die Umgebung abgegebene Abgas rußbefreit bzw. weitestgehend rußbefreit, jedoch wird quasi an stelle des unerwünschten Rußes nunmehr NO2 an die Umgebung abgegeben. CRT-Systeme werden derzeit vor allem zum Reinigen der Abgase von Dieselmotoren von Bussen und Lastkraftwagen eingesetzt. Insbesondere in Ballungszentren wo viele derartige Fahrzeuge bewegt werden und eine Luftzirkulation nur untergeordnet stattfindet, ist der Ausstoß von NO2 unerwünscht.Various methods have become known for cleaning the exhaust gases of an internal combustion engine, in particular a diesel internal combustion engine. Different processes also lead to different cleaning results. A distinction must be made in these processes between active cleaning processes, in which active process control takes place as a function of certain monitored criteria, with the additional energy required being coupled in in a controlled manner, and passive systems which are operated without active control. The latter are of course simpler in structure than active exhaust gas purification systems because of the unnecessary control elements and active components, for example heaters or burners. A passive exhaust gas purification system that has been used for many years is the so-called CRT system (continous regenerating trap) for removing soot particles from the exhaust gas stream. In this system, the nitrogen monoxide (NO) contained in the exhaust gas stream is first oxidized to nitrogen dioxide (NO 2 ) on an oxidation catalyst. This NO 2 is generated to provide an oxidizing agent with which soot particles can be oxidized and thus burned. For this purpose, a particle filter for filtering out the soot particles from the exhaust gas stream in the flow direction of the exhaust gas is connected downstream of the oxidation catalyst to generate the NO 2 required for soot oxidation. In this process, the soot particles accumulating on the upstream surface of the particle filter are continuously oxidized by the NO 2 impinging on the soot particles, the carbon-containing soot particles being essentially converted to carbon dioxide and water. In this oxidation process, the NO 2 used as the oxidizing agent is reduced to NO. To ensure that there is sufficient NO 2 in the exhaust gas flow to effect the desired soot particle oxidation in any case, even in different operating situations, this method must be operated with an excess of NO 2 . The consequence of this is that non-reduced NO 2 is inevitably released into the environment. This is undesirable because NO 2 is more toxic than NO. Even in low concentrations, NO 2 is noticeable through the smell of chlorine. Although the exhaust gas released into the environment when using such a system is soot-free or largely soot-free, however, NO 2 is now quasi released to the environment in place of the unwanted soot. CRT systems are currently mainly used to clean the exhaust gases of diesel engines from buses and trucks. The emission of NO 2 is undesirable, particularly in metropolitan areas where many such vehicles are moved and air circulation takes place only to a minor extent.
Auch aus diesem Grunde sind Systeme
entwickelt worden, mit denen der NOx-Anteil
im Abgas aus diesem entfernt wird. Beschrieben ist ein solches aktives
NOx-Reinigungssystem beispielsweise
Die dem in
Zwar ist mit den beiden beschriebenen aktiven Verfahren neben einer Rußentfernung auch eine Entstickung des Abgases möglich. Dieses ist jedoch nicht in jedem Fall erforderlich. Insbesondere eignen sich diese bekannten aktiven Verfahren nicht zum Nachrüsten von bereits installierten passiven Abgasreinigungssystemen (CRT-Systemen), mit denen lediglich Rußpartikel aus dem Abgasstrom entfernt werden sollen.Although described with the two active processes in addition to soot removal, denitrification of the exhaust gas possible. However, this is not always necessary. In particular these known active methods are not suitable for retrofitting Passive emission control systems (CRT systems) already installed, with which only soot particles are to be removed from the exhaust gas stream.
Ausgehend von diesem diskutierten Stand der Technik liegt der Erfindung daher die Aufgabe zugrunde, ein eingangs genanntes Verfahren sowie eine eingangs genannte passive Abgasreinigungseinrichtung dergestalt weiterzubilden, dass die zu der zuvor beschriebenen passiven Abgasreinigungseinrichtung beschriebenen Nachteile vermieden sind.Based on this discussed State of the art, the invention is therefore based on the object a method mentioned at the beginning and a passive method mentioned at the beginning Exhaust gas purification device in such a way that the to the previously described passive emission control device Disadvantages are avoided.
Die verfahrensbezogene Aufgabe wird erfindungsgemäß dadurch gelöst, dass dem Schritt des Oxidierens der Rußpartikel nachgeschaltet ein Schritt des Reduzierens des im Abgasstrom verbliebenen Stickstoffdioxids zu Stickstoffmonoxid durchgeführt wird.The procedural task is according to the invention solved, that the step of oxidizing the soot particles is followed by a step reducing the nitrogen dioxide remaining in the exhaust gas stream carried out to nitric oxide becomes.
Die vorrichtungsbezogene Aufgabe wird erfindungsgemäß dadurch gelöst, dass in Strömungsrichtung der zum Herausfiltern der Rußpartikel wirksamen Oberfläche des Partikelfilters nachgeschaltet eine katalytische Oberfläche zum Reduzieren von im Abgasstrom enthaltenen Stickstoffdioxid zu Stickstoffmonoxid angeordnet ist.The device-related task according to the invention solved, that in the direction of flow to filter out the soot particles effective surface The particle filter is followed by a catalytic surface for Reduce nitrogen dioxide contained in the exhaust gas stream to nitrogen monoxide is arranged.
Bei dem beanspruchten Verfahren und entsprechend auch bei der beanspruchten Abgasreinigungseinrichtung wird der NO2-Überschuss in Strömungsrichtung des Abgases der wirksamen Filteroberfläche des Partikelfilters nachgeschaltet wieder zu Stickstoffmonoxid (NO) reduziert. Das an die Umgebung abgegebene bzw. ausgestoßene Abgas enthält somit kein NO2 und nur soviel NO, wie durch die Verbrennung des Kraftstoffes verursacht. Als Reduktionsmittel werden zweckmäßigennreise die im Abgasstrom ohnehin enthaltenen und für die gewünschte Reduktion geeigneten Mittel eingesetzt, beispielsweise die im Abgasstrom enthaltenen Kohlenwasserstoffe und/oder das im Abgasstrom enthaltene Kohlenmonoxid. Dabei ist es durchaus möglich, überschüssiges und für die gewünschte NO2-Reduktion nicht benötigte Reduktionsmittel zwischenzuspeichern. Andererseits ist auch eine Zwischenspeicherung von NO2 denkbar, bis entsprechende Reduktionsmittel im Abgas vorhanden sind. Die Reduktion kann beispielsweise an einem eigenen Katalysator erfolgen oder auch an einer entsprechend ausgebildeten und/oder dotierten Oberfläche. Diese Oberfläche kann beispielsweise die abströmseitige Oberfläche des Dieselpartikelfilters sein. Als Reduktionskatalysator kann beispielsweise auch ein Einsatz dienen, der in jede abströmseitig offene Filtertasche des Dieselpartikelfilters aus Sintermetall eingesetzt ist. Ein solcher Einsatz kann gleichzeitig als Abstandhalter zum Offenhalten der abströmseitig offenen Filtertaschen dienen. Für den Fall, dass ein eigener Reduktionskatalysator vorgesehen ist, wobei dieser sich ebenfalls als Einsatz in den abströmseitig offenen Filtertaschen des Dieselpartikelfilters befinden kann, kann dieser beispielsweise aus Metall oder aus einem Keramikwerkstoff bestehen.In the claimed method and correspondingly also in the claimed exhaust gas purification device, the NO 2 excess downstream of the effective filter surface of the particle filter is reduced again to nitrogen monoxide (NO) in the flow direction of the exhaust gas. The exhaust gas released or expelled into the environment therefore contains no NO 2 and only as much NO as is caused by the combustion of the fuel. As reducing agents, the agents contained in the exhaust gas stream and suitable for the desired reduction are expediently used, for example the hydrocarbons contained in the exhaust gas stream and / or the carbon monoxide contained in the exhaust gas stream. It is entirely possible to temporarily store excess reducing agent that is not required for the desired NO 2 reduction. On the other hand, temporary storage of NO 2 is also conceivable until corresponding reducing agents are present in the exhaust gas. The reduction can take place, for example, on a separate catalyst or also on a suitably designed and / or doped surface. This surface can be, for example, the downstream surface of the diesel particle filter. An insert, for example, can also serve as a reduction catalytic converter, which is inserted into each filter pocket of the diesel particle filter made of sintered metal that is open on the outflow side. Such an insert can simultaneously serve as a spacer for keeping the filter pockets open on the outflow side. In the event that a dedicated reduction catalytic converter is provided, which can also be located as an insert in the filter pockets of the diesel particulate filter which are open on the outflow side, the catalytic converter can be made of metal or a ceramic material, for example.
Nachfolgend ist die Erfindung anhand
der beigefügten
- 11
- Abgasreinigungseinrichtungexhaust gas cleaning device
- 22
- Oxidationskatalysatoroxidation catalyst
- 33
- Dieselpartikelfilterdiesel particulate Filter
- 44
- Reduktionskatalysatorreduction catalyst
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002143488 DE10243488A1 (en) | 2002-09-19 | 2002-09-19 | Purification of exhaust gas from internal combustion engine, especially diesel engine, by oxidizing trapped soot particles with nitrogen dioxide obtained by oxidizing monoxide is followed by reduction of excess dioxide |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002143488 DE10243488A1 (en) | 2002-09-19 | 2002-09-19 | Purification of exhaust gas from internal combustion engine, especially diesel engine, by oxidizing trapped soot particles with nitrogen dioxide obtained by oxidizing monoxide is followed by reduction of excess dioxide |
Publications (1)
Publication Number | Publication Date |
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DE10243488A1 true DE10243488A1 (en) | 2004-04-01 |
Family
ID=31969256
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DE2002143488 Withdrawn DE10243488A1 (en) | 2002-09-19 | 2002-09-19 | Purification of exhaust gas from internal combustion engine, especially diesel engine, by oxidizing trapped soot particles with nitrogen dioxide obtained by oxidizing monoxide is followed by reduction of excess dioxide |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1777384A1 (en) * | 2005-10-18 | 2007-04-25 | MAN Nutzfahrzeuge Aktiengesellschaft | Method avoiding unwanted NO2 emissions from internal combustion engines |
WO2008103110A1 (en) * | 2007-02-21 | 2008-08-28 | Volvo Lastvagnar Ab | Exhaust gas after treatment system (eats) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0408772A1 (en) * | 1989-02-07 | 1991-01-23 | Ebara Corporation | Exhaust gas cleaning method |
DE19520604A1 (en) * | 1995-06-06 | 1996-08-01 | Daimler Benz Ag | Exhaust-gas cleaning system with additional burner for diesel engine |
EP0758713A1 (en) * | 1995-08-14 | 1997-02-19 | Toyota Jidosha Kabushiki Kaisha | A method for purifying exhaust gas of a diesel engine |
-
2002
- 2002-09-19 DE DE2002143488 patent/DE10243488A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0408772A1 (en) * | 1989-02-07 | 1991-01-23 | Ebara Corporation | Exhaust gas cleaning method |
DE19520604A1 (en) * | 1995-06-06 | 1996-08-01 | Daimler Benz Ag | Exhaust-gas cleaning system with additional burner for diesel engine |
EP0758713A1 (en) * | 1995-08-14 | 1997-02-19 | Toyota Jidosha Kabushiki Kaisha | A method for purifying exhaust gas of a diesel engine |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1777384A1 (en) * | 2005-10-18 | 2007-04-25 | MAN Nutzfahrzeuge Aktiengesellschaft | Method avoiding unwanted NO2 emissions from internal combustion engines |
WO2008103110A1 (en) * | 2007-02-21 | 2008-08-28 | Volvo Lastvagnar Ab | Exhaust gas after treatment system (eats) |
US8640443B2 (en) | 2007-02-21 | 2014-02-04 | Volvo Lastvagnar Ab | Exhaust gas after treatment system (EATS) |
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