WO2008022751A2 - procédé de gestion d'une installation d'épuration des gaz d'échappement d'un moteur à essence fonctionnant en conditions pauvres - Google Patents

procédé de gestion d'une installation d'épuration des gaz d'échappement d'un moteur à essence fonctionnant en conditions pauvres Download PDF

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Publication number
WO2008022751A2
WO2008022751A2 PCT/EP2007/007290 EP2007007290W WO2008022751A2 WO 2008022751 A2 WO2008022751 A2 WO 2008022751A2 EP 2007007290 W EP2007007290 W EP 2007007290W WO 2008022751 A2 WO2008022751 A2 WO 2008022751A2
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
lean
engine
catalyst
nitrogen oxide
Prior art date
Application number
PCT/EP2007/007290
Other languages
German (de)
English (en)
Other versions
WO2008022751A3 (fr
Inventor
Susanne Philipp
Torsten Franke
Stephan Eckhoff
Wilfried Mueller
Thomas Kreuzer
Hubert Bichler
Rainer Zimmer
Christof Schoen
Original Assignee
Umicore Ag & Co. Kg
Bayerische Motoren Werke Ag
Daimlerchrisler Ag
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 Umicore Ag & Co. Kg, Bayerische Motoren Werke Ag, Daimlerchrisler Ag filed Critical Umicore Ag & Co. Kg
Publication of WO2008022751A2 publication Critical patent/WO2008022751A2/fr
Publication of WO2008022751A3 publication Critical patent/WO2008022751A3/fr

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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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • F01N3/08—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
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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

Definitions

  • the invention relates to a method for operating an exhaust gas purification system on a lean-burn gasoline engine, which first contains a nitrogen oxide storage catalyst and then an SCR catalyst in the flow direction of the exhaust gas, wherein the exhaust gas contains nitrogen oxides, which are converted by the operation of the emission control system to harmless compounds should.
  • Exhaust gas purification systems which contain a nitrogen oxide storage catalyst and an SCR catalyst in the flow direction of the exhaust gas, are known.
  • a nitrogen oxide storage catalyst and an SCR catalyst in the flow direction of the exhaust gas
  • Such a plant is described for example in US 6,182,443 for the treatment of the exhaust gas of a diesel engine.
  • the diesel engine is operated with a constantly lean air / fuel mixture.
  • the nitrogen oxides contained in the diesel exhaust are absorbed by the nitrogen oxide storage catalyst.
  • the stored nitrogen oxides are thermally desorbed and reduced to nitrogen in the following SCR catalyst.
  • ammonia or urea is added to the exhaust gas before the SCR catalyst when the SCR catalyst has reached its light-off temperature.
  • the published patent application US 2006/0010857 A1 likewise discloses an exhaust gas purification system for a diesel engine comprising a nitrogen oxide storage catalytic converter and a downstream SCR catalytic converter.
  • the diesel engine is operated with a constantly lean air / fuel mixture.
  • a reducing agent is supplied to the exhaust gas upstream of the storage catalytic converter.
  • ammonia is generated by the storage catalytic converter. This is stored by the SCR catalyst and used in a period that follows directly on the regeneration of the storage catalyst for the reduction of nitrogen oxides, which are not absorbed by the nitrogen oxide storage catalyst.
  • the publication US 2005/0129601 Al also describes an exhaust gas purification plant, which in the flow direction of the exhaust gas, a nitrogen oxide storage lysator and an SCR catalyst.
  • the exhaust gas is periodically emaciated and enriched.
  • the nitrogen oxides contained in the exhaust gas are stored by the storage catalytic converter.
  • the nitrogen oxides stored by the storage catalyst are reduced to ammonia.
  • the mixture of ammonia and unreacted nitrogen oxides is converted to nitrogen and water on the SCR catalyst.
  • DE 100 11 612 A1 describes an exhaust gas purification system for an internal combustion engine, which likewise consists of a nitrogen oxide storage catalytic converter and an SCR catalytic converter.
  • the engine is alternately operated with lean and rich air / fuel mixture in order to be able to convert the nitrogen oxides contained in the exhaust gas to the nitrogen oxide storage catalytic converter.
  • the engine is operated with a stoichiometric air / fuel mixture and at full load the engine is supplied with a rich air / fuel mixture.
  • JP 2002-188429 also describes an exhaust gas purification system for a lean-burn engine comprising a nitrogen oxide storage catalyst and an SCR catalyst. The addition of reductant before the nitrogen oxide storage catalyst is stopped when the amount of reductant exceeds a threshold and is then fed to the SCR catalyst.
  • JP 2003-286827 describes another exhaust gas purification system comprising a nitrogen oxide storage catalytic converter and an SCR catalytic converter. The nitrogen oxide storage catalyst absorbs the nitrogen oxides contained in the exhaust gas below a predetermined temperature and desorbs them above this temperature. The desorbed nitrogen oxides are converted by the downstream SCR catalyst.
  • Another exhaust gas purification system for a lean-burn engine is described in JP 2004-218575. It also contains a nitrogen oxide storage catalyst and an SCR catalyst. In contrast to the systems described so far, the SCR catalytic converter is connected upstream of the nitrogen oxide storage catalytic converter.
  • the known methods for removing the nitrogen oxides by means of a nitrogen oxide storage catalytic converter and a downstream SCR catalytic converter are not suitable for effectively cleaning the exhaust gas from lean-burn gasoline engines over wide ranges of the possible operating states.
  • conventional gasoline lean-burn gasoline engines with stratified gasoline direct injection from a certain vehicle speed can no longer be operated with lean air / fuel mixture and must be switched to stoichiometric operation
  • the modern gasoline lean-burn engines with spray-guided gasoline direct injection capable, even at significant to work at higher speeds with lean mixture preparation.
  • the engine generates exhaust gas at high temperatures above, for example, 500 ° C and with high exhaust gas mass flows.
  • Nitrogen storage catalysts typically have a temperature window for optimum operation between about 200 and 450 ° C. Above 450 ° C, nitrogen oxide storage catalysts are no longer able to store the nitrogen oxides. Therefore, for example, the nitrogen oxide storage catalyst in US 2005/0129601 A1 can no longer form ammonia at temperatures above 450 ° C. in the rich periods for the selective reduction of the nitrogen oxides on the downstream SCR catalyst.
  • the object of the present invention is therefore to provide a method for operating an exhaust gas purification system comprising a nitrogen oxide storage catalytic converter and an SCR catalytic converter, which over a wide range of operating conditions, especially those with high exhaust gas temperatures and high NOx mass flows, the nitrogen oxides in the exhaust of modern Can effectively convert gasoline lean-burn engines into harmless products.
  • This object is achieved by a method for operating an exhaust-gas purification system on a lean-burn engine of a vehicle which first contains a nitrogen oxide storage catalytic converter and then an SCR catalytic converter in the flow direction of the exhaust gas, the exhaust gas having an exhaust gas temperature which is dependent on the instantaneous operating state of the engine and including nitrogen oxides as pollutants.
  • the method is characterized in that
  • the engine is operated with a constantly lean air / fuel mixture when the operating condition of the engine produces an exhaust gas temperature above the predetermined temperature, and during this operating condition prior to the SCR catalyst, the exhaust gas is ammonia directly or in the form of an ammonia-decomposable one Connection is supplied.
  • the lean-burn engine is operated at low exhaust gas temperatures with alternately lean and rich air / fuel mixture.
  • the nitrogen oxides contained in the exhaust gas are stored by the storage catalytic converter. If the storage capacity of the storage catalytic converter is exhausted, it is regenerated by switching the engine to rich operation. In this case, a portion of the stored nitrogen oxides is reduced to ammonia in this temperature range, which is cached by the downstream SCR catalyst.
  • the stored ammonia serves to reduce nitrogen oxides which are not absorbed by the storage catalytic converter.
  • This mode of operation of the exhaust gas purification system is advantageous only in the lower temperature range.
  • the storage capacity of the storage catalyst is reduced and only small amounts of ammonia are formed.
  • Above about 450 to 500 ° C there is no significant storage of nitrogen oxides more, so that no sufficient amounts of ammonia are formed.
  • a stoichiometric or substoichiometric air / fuel mixture is converted in order to ensure a further effective NOx aftertreatment.
  • the advantage of saving fuel is no longer given. Therefore, according to the invention, at operating conditions of the engine with higher exhaust gas temperatures, the engine is constantly operated with a lean air / fuel mixture.
  • Ammonia or a decomposable to ammonia compound is injected into the exhaust gas, whereby the nitrogen oxides are continuously converted to nitrogen. It is also advantageous in this case that the nitrogen dioxide formed on the nitrogen oxide storage catalyst of nitrogen monoxide improves the nitrogen oxide conversion on the SCR catalyst in this temperature range.
  • the optimum temperature for switching from one operating mode to the other depends on the type of engine and the respective operating conditions as well as the degree of aging of the NOx storage catalytic converter and is usually between 300 and 500 ° C
  • the method is particularly suitable for lean burn engines with spray-guided gasoline direct injection, which can be operated even at high load conditions with a lean air / Krafitstoff mixture.
  • the method has several advantages over the prior art methods.
  • In the lower temperature range it is possible by the ammonia formed on the storage catalyst during the regeneration to achieve an additional nitrogen oxide reduction on the SCR catalyst.
  • the emission of ammonia is avoided by absorption on the SCR catalyst.
  • the reductant metering e.g., urea as a compound decomposable to ammonia
  • the SCR catalyst may not yet be used, thereby reducing urea consumption. Only from about 350 ° C, it is necessary to meter reducing agent.
  • the downstream SCR catalytic converter contributes to nitrogen oxide reduction.
  • the SCR catalyst can be used solely for nitrogen oxide reduction. Furthermore, there are situations in which desulfurization of the nitrogen oxide storage catalyst is not possible because the high temperatures required for desulfurization can not be achieved. as when operating the vehicle in city traffic or in a traffic jam. Again, then the SCR catalyst can be used alone for nitrogen oxide reduction.
  • the SCR system with reductant dosing may continue to be used for NOx reduction.
  • Exhaust gas purification systems with NOx storage catalytic converter and downstream SCR catalyst may also contain before the NOx storage catalyst, a three-way catalyst, an oxidation catalyst or another, optionally high temperature stable NOx storage catalyst.
  • a supplemental catalyst can improve hydrocarbon conversion and further increase nitrogen oxide conversion rates.
  • Nitrogen storage catalysts contain as storage material for the nitrogen oxides basic compounds of alkali or alkaline earth metals and at least one noble metal from the group platinum, palladium and rhodium.
  • SCR catalysts may be based on zeolites exchanged with noble metals or subgroup metals.
  • SCR catalysts are known which contain a mixture of the solid acids vanadium oxide, tungsten oxide and molybdenum oxide.
  • the method is particularly suitable for emission control systems from a near-engine nitrogen oxide storage catalyst and an arranged in the underbody area of the vehicle SCR catalyst.
  • Near-engine means here that the distance of the catalyst to the exhaust manifold is less than 0.8 m and the underfloor position is characterized by a distance from the catalyst to the exhaust manifold of more than 1, 0 m.
  • the alternating operation with lean and rich air / fuel mixture leads here already shortly after the cold start and also during operating phases of the engine with low exhaust gas temperatures to good nitrogen oxide sales. Operating phases with low exhaust gas temperatures occur, for example, in idling mode at low speed / load collectivities of the engine, or generally when using large displacement engines, and especially diesel engines.
  • the nitrogen oxides are stored by the near-engine nitrogen oxide storage catalyst only to a small extent. He then acts essentially as an oxidation catalyst.
  • the nitrogen oxides contained in the exhaust gas are converted in the SCR catalyst in the underfloor region in these operating conditions. For this purpose, ammonia or a decomposable to ammonia compound is supplied to the exhaust gas before entering the SCR catalyst.
  • a close-coupled nitrogen oxide storage catalyst can be much easier desulfurize than in appropriate underbody position, since heating the catalyst to the desulfurization temperature of about 550 to 800 ° C in the engine near much easier and is associated with lower fuel consumption ,
  • FIG. 1 emission control system for carrying out the method
  • Figure 1 shows the structure of the exhaust gas purification system as it can be used for the inventive method.
  • the exhaust gas coming from the lean-burn engine is first led through a nitrogen oxide storage catalytic converter (NSC). Downstream of the nitrogen oxide storage catalytic converter, the SCR catalytic converter (SCR) is inserted into the exhaust gas line. Between the nitrogen oxide storage catalytic converter and the SCR catalytic converter, a device for injecting, for example, urea into the exhaust gas flow is provided.
  • NSC nitrogen oxide storage catalytic converter
  • SCR SCR catalytic converter
  • FIG. 2 shows four nitrogen oxide conversion curves for three different exhaust gas purification systems as a function of the exhaust gas temperature for different modes of operation.
  • the four different sales curves are designated as follows: NSC: Nitrogen oxide conversion of a NOx storage catalyst during rich / lean operation over the entire temperature range of the diagram
  • SCR Nitrogen oxide conversion of an SCR catalyst at constant lean operation over the entire temperature range with external addition of ammonia as reducing agent
  • Nitrogen oxide conversion of an exhaust gas purification system from NOx storage catalyst and SCR catalyst when operating by the novel process rich / lean operation below 350 ° C and constant lean operation with NH 3 - addition above 350 ° C.
  • the turnover curve denoted by “NSC” shows a bad NOx conversion in the high temperature range
  • the sales curve denoted by “SCR” has a very good NOx conversion in the high temperature range, but has disadvantages in the low temperature range.
  • the "NSC + SCR (without NH 3)" with designated sales curve for the emission control system of the nitrogen oxide storage catalyst and SCR catalyst exhibits at rich / lean operation without addition of NH 3 good low-temperature activity.
  • the high-temperature activity is insufficient.
  • NOx After-treatment in diesel exhaust gas such a system is sufficient in most cases, especially with an upstream diesel oxidation catalyst, since hardly any temperatures in the subfloor are reached above 450-500 ° C.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Selon l'invention, pour éliminer les oxydes d'azote présents dans les gaz d'échappement d'un moteur travaillant en conditions pauvres, on connaît la technique qui consiste à utiliser une installation d'épuration des gaz d'échappement constituée d'un catalyseur-accumulateur d'oxydes d'azote et d'un catalyseur SCR et de faire travailler le moteur en alternance avec des mélanges pauvres et des mélanges riches d'air et de carburant. L'ammoniac nécessaire pour la réaction SCR y est formé pendant la régénération du catalyseur-accumulateur d'oxydes d'azote. Un désavantage en est qu'à haute température, on ne forme plus suffisamment d'ammoniac lors de la régénération. L'invention concerne donc, lorsque la température des gaz d'échappement est supérieure à environ 350 °C, l'injection d'ammoniac en amont du catalyseur SCR. Lorsque la température des gaz d'échappement est inférieure à 350 °C, on interrompt l'injection d'ammoniac. Le procédé convient particulièrement bien pour des moteurs travaillant en conditions pauvres et dotés d'une injection directe d'essence en jet, mais qui peuvent aussi travailler sous forte charge avec un mélange pauvre d'air et de carburant.
PCT/EP2007/007290 2006-08-19 2007-08-17 procédé de gestion d'une installation d'épuration des gaz d'échappement d'un moteur à essence fonctionnant en conditions pauvres WO2008022751A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06017313 2006-08-19
EP06017313.5 2006-08-19

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WO2008022751A3 WO2008022751A3 (fr) 2008-04-17

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001724A1 (de) 2008-05-13 2009-11-19 Robert Bosch Gmbh Verfahren und Vorrichtung zur Abgasoptimierung einer Brennkraftmaschine
DE102008047722A1 (de) 2008-09-18 2010-03-25 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Betreiben einer Abgasreinigungsanlage
FR2941874A1 (fr) * 2009-02-06 2010-08-13 Inst Francais Du Petrole Procede de traitement en depollution des oxydes d'azote contenus dans des gaz d'echappement d'un moteur a combustion interne
WO2012029051A1 (fr) 2010-09-02 2012-03-08 Basf Se Catalyseur pour moteur à essence à mélange pauvre, à formation de nh3 améliorée
WO2012029050A1 (fr) 2010-09-02 2012-03-08 Basf Se Catalyseur pour moteurs à essence à mélange pauvre, à oxydation de no améliorée
US8950174B2 (en) 2010-09-02 2015-02-10 Basf Se Catalysts for gasoline lean burn engines with improved NH3-formation activity
FR3020830A1 (fr) * 2014-05-06 2015-11-13 Peugeot Citroen Automobiles Sa Vehicule automobile a systeme de depollution ameliore
FR3020831A1 (fr) * 2014-05-06 2015-11-13 Peugeot Citroen Automobiles Sa Vehicule automobile a fonction de depollution a basses temperatures
US9242242B2 (en) 2010-09-02 2016-01-26 Basf Se Catalyst for gasoline lean burn engines with improved NO oxidation activity
FR3025725A1 (fr) * 2014-09-15 2016-03-18 Peugeot Citroen Automobiles Sa Procede de depollution des oxydes d'azote

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10011612A1 (de) * 1999-03-11 2000-10-26 Toyota Motor Co Ltd Emissionsregelvorrichtung für einen Verbrennungsmotor
DE10113947A1 (de) * 2001-03-22 2002-09-26 Daimler Chrysler Ag Verfahren zur Verringerung des Stickoxidgehalts im Abgas einer im Mager-Fett-Wechsel betreibbaren Brennkraftmaschine
DE10152187A1 (de) * 2001-10-23 2003-04-30 Daimler Chrysler Ag Abgasreinigungsanlage mit Stickoxid-Speicherkatalysator und SCR-Katalysator und Verfahren zur Verminderung des Stickoxidgehalts im Abgas von Brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10011612A1 (de) * 1999-03-11 2000-10-26 Toyota Motor Co Ltd Emissionsregelvorrichtung für einen Verbrennungsmotor
DE10113947A1 (de) * 2001-03-22 2002-09-26 Daimler Chrysler Ag Verfahren zur Verringerung des Stickoxidgehalts im Abgas einer im Mager-Fett-Wechsel betreibbaren Brennkraftmaschine
DE10152187A1 (de) * 2001-10-23 2003-04-30 Daimler Chrysler Ag Abgasreinigungsanlage mit Stickoxid-Speicherkatalysator und SCR-Katalysator und Verfahren zur Verminderung des Stickoxidgehalts im Abgas von Brennkraftmaschinen

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001724A1 (de) 2008-05-13 2009-11-19 Robert Bosch Gmbh Verfahren und Vorrichtung zur Abgasoptimierung einer Brennkraftmaschine
DE102008001724B4 (de) 2008-05-13 2021-10-07 Robert Bosch Gmbh Verfahren und Vorrichtung zur Abgasoptimierung einer Brennkraftmaschine
DE102008047722A1 (de) 2008-09-18 2010-03-25 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Betreiben einer Abgasreinigungsanlage
FR2941874A1 (fr) * 2009-02-06 2010-08-13 Inst Francais Du Petrole Procede de traitement en depollution des oxydes d'azote contenus dans des gaz d'echappement d'un moteur a combustion interne
WO2012029051A1 (fr) 2010-09-02 2012-03-08 Basf Se Catalyseur pour moteur à essence à mélange pauvre, à formation de nh3 améliorée
WO2012029050A1 (fr) 2010-09-02 2012-03-08 Basf Se Catalyseur pour moteurs à essence à mélange pauvre, à oxydation de no améliorée
US8950174B2 (en) 2010-09-02 2015-02-10 Basf Se Catalysts for gasoline lean burn engines with improved NH3-formation activity
US9242242B2 (en) 2010-09-02 2016-01-26 Basf Se Catalyst for gasoline lean burn engines with improved NO oxidation activity
FR3020830A1 (fr) * 2014-05-06 2015-11-13 Peugeot Citroen Automobiles Sa Vehicule automobile a systeme de depollution ameliore
FR3020831A1 (fr) * 2014-05-06 2015-11-13 Peugeot Citroen Automobiles Sa Vehicule automobile a fonction de depollution a basses temperatures
FR3025725A1 (fr) * 2014-09-15 2016-03-18 Peugeot Citroen Automobiles Sa Procede de depollution des oxydes d'azote
WO2016042224A1 (fr) * 2014-09-15 2016-03-24 Peugeot Citroen Automobiles Sa Procédé de dépollution des oxydes d'azote

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