US20050102999A1 - Method for aftertreatment of exhaust gases of internal combustion engines and corresponding device - Google Patents

Method for aftertreatment of exhaust gases of internal combustion engines and corresponding device Download PDF

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Publication number
US20050102999A1
US20050102999A1 US10/497,411 US49741104A US2005102999A1 US 20050102999 A1 US20050102999 A1 US 20050102999A1 US 49741104 A US49741104 A US 49741104A US 2005102999 A1 US2005102999 A1 US 2005102999A1
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United States
Prior art keywords
exhaust gas
converter
scr catalytic
catalytic converter
reducing agent
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.)
Abandoned
Application number
US10/497,411
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English (en)
Inventor
Johannes Schaller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHALLER, JOHANNES
Publication of US20050102999A1 publication Critical patent/US20050102999A1/en
Abandoned legal-status Critical Current

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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
    • F01N3/0892—Electric or magnetic treatment, e.g. dissociation of noxious components
    • 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]
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/28—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a plasma reactor
    • 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
    • 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
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • 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 present invention relates to a method for the aftertreatment of exhaust gases of internal combustion engines, in particular for reducing the proportion of NO x in the exhaust gases, NO x being reduced in the presence of O 2 via an SCR (Selective Catalytic Reduction) catalytic converter using a reducing agent. Furthermore, the present invention relates to a device for the aftertreatment of exhaust gases of internal combustion engines, in particular for executing the above-mentioned method.
  • U.S. Pat. No. 5,893,267 discusses an exhaust emission control system in which a plasma reactor is arranged upstream from an SCR catalytic converter. In addition to exhaust gas, fuel is also supplied to the plasma reactor. According to this patent, the plasma oxidizes NO to NO 2 in a first step and breaks down the original hydrocarbons of the fuel into smaller molecules. In a second step, the smaller molecules should significantly increase the activity of the SCR catalytic converter. This should result in a significant synergy effect through the combination of the plasma with the SCR catalytic converter. Compared to using ammonia as a reducing agent, the use of hydrocarbons as a reducing agent is presented in this publication as being more practical, more cost-effective, and environmentally friendlier.
  • This object may be achieved by a method in which fuel as a reducing agent is introduced downstream from the oxidizing converter and upstream from the SCR catalytic converter.
  • this object may be achieved by using a system in which fuel as a reducing agent is supplied via an introduction device.
  • the present invention provides a method and a device for the aftertreatment of exhaust gases of internal combustion engines, in particular for reducing the proportion of NO x in the exhaust gases, the NO x being reduced in the presence of O 2 and a reducing agent.
  • Such methods are referred to by the term SCR (Selective Catalytic Reduction) technology.
  • the method according to the present invention is based on the recognition that in SCR technology, when reducing agents are used which have no high selectivity, NO 2 is reduced while NO is only marginally influenced or not at all. Therefore, according to the present invention, the exhaust gases are pre-conditioned prior to reduction via SCR technology in such a manner that the largest possible proportion of NO x or NO is converted into NO 2 . Subsequent to the conversion of NO into NO 2 , the proportion of NO in the exhaust gases is consequently lower and the proportion of NO 2 is correspondingly higher. Since NO 2 is converted in the subsequent reduction, the proportion of NO x in the exhaust gases is reduced overall due to the prior conversion of NO into NO 2 .
  • Fuel is used as a reducing agent in the present invention.
  • Using fuel provides the advantage that fuel is available in the vehicle for supplying the internal combustion engine.
  • the proportion of NO 2 may be reduced using SCR technology due to the conversion of a large proportion of NO 2 of the exhaust gases.
  • NO x or NO is converted into NO 2 using the oxidizing converter before the exhaust gases are supplied to the SCR catalytic converter.
  • This has the advantage that fuel as a reducing agent having low selectivity may also be used for the aftertreatment of the exhaust gases and, in particular, for reducing the proportion of NO x in the exhaust gases.
  • FIG. 1 shows an exemplary embodiment of the present invention.
  • FIG. 1 shows an exhaust gas tract 10 in which exhaust gases A, coming from the internal combustion engine, are initially supplied to an oxidizing converter 12 .
  • Oxidizing converter 12 is used for converting NO, contained in exhaust gas A, into NO 2 . Due to oxidizing converter 12 , the proportion of NO in exhaust gas A is consequently reduced and the proportion of NO 2 in exhaust gas A is correspondingly increased.
  • An introduction device 14 which introduces reducing agent into exhaust tract 10 in the form of, for example, fuel K, is arranged downstream from oxidizing converter 12 .
  • An SCR catalytic converter 16 which reduces NO x in the presence of O 2 using reducing agent K, is arranged downstream from introduction device 14 .
  • Using fuel provides the advantage that fuel is available in the vehicle.
  • a different reducing agent, ammonia for example, must be stocked up separately as another operating supply item.
  • the proportion of platinum in the SCR catalytic converter should be as low as possible to prevent a conversion of NO x into N 2 O to the greatest possible extent.
US10/497,411 2001-12-03 2002-11-21 Method for aftertreatment of exhaust gases of internal combustion engines and corresponding device Abandoned US20050102999A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10159849.1 2001-12-06
DE10159849A DE10159849A1 (de) 2001-12-06 2001-12-06 Verfahren zur Nachbehandlung von Abgasen von Brennkraftmaschinen und Einrichtung hierfür
PCT/DE2002/004286 WO2003050399A1 (de) 2001-12-06 2002-11-21 Verfahren zur nachbehandlung von abgasen von brennkraftmaschinen und einrichtung hierfür

Publications (1)

Publication Number Publication Date
US20050102999A1 true US20050102999A1 (en) 2005-05-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/497,411 Abandoned US20050102999A1 (en) 2001-12-03 2002-11-21 Method for aftertreatment of exhaust gases of internal combustion engines and corresponding device

Country Status (5)

Country Link
US (1) US20050102999A1 (de)
EP (1) EP1456512A1 (de)
JP (1) JP2005511962A (de)
DE (1) DE10159849A1 (de)
WO (1) WO2003050399A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110146239A1 (en) * 2009-12-21 2011-06-23 Robert Bosch Gmbh Method for monitoring a pollutant conversion capacity in an exhaust gas aftertreatment system

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004056412B4 (de) * 2004-11-23 2016-06-16 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine und Vorrichtung zur Durchführung des Verfahrens
DE102004061247B4 (de) 2004-12-20 2024-03-21 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine und Vorrichtung zur Durchführung des Verfahrens
DE102005001119B4 (de) 2005-01-10 2018-02-15 Robert Bosch Gmbh Verfahren zum Betreiben einer Brennkraftmaschine und Vorrichtung zur Durchführung des Verfahrens
DE102005009464B4 (de) 2005-03-02 2016-07-21 Robert Bosch Gmbh Verfahren zur Diagnose eines Systems zur Dosierung von Reagenzmittel und Druckluft in den Abgasbereich einer Brennkraftmaschine und Vorrichtung zur Durchführung des Verfahrens
DE102006005863B4 (de) 2006-02-09 2015-04-30 Robert Bosch Gmbh Verfahren zur Diagnose einer Abgasbehandlungsvorrichtung und Vorrichtung zur Durchführung des Verfahrens
DE102006016447A1 (de) 2006-04-07 2007-10-11 Robert Bosch Gmbh Verfahren zum Betreiben einer Dosiervorrichtung eines Abgas-Reinigungssystems und Vorrichtung zur Durchführung des Verfahrens
DE102007025621A1 (de) 2007-06-01 2008-12-04 Robert Bosch Gmbh Diagnoseverfahren für eine Reagenzmittel-Dosiereinrichtung und Vorrichtung zur Durchführung des Verfahrens
DE102008002508A1 (de) 2008-06-18 2009-12-24 Robert Bosch Gmbh Verfahren zum Betreiben einer Reagenzmittel-Dosiereinrichtung und Vorrichtung zur Durchführung des Verfahrens

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5893267A (en) * 1996-08-19 1999-04-13 The Regents Of The University Of California Catalytic reduction system for oxygen-rich exhaust
US6182443B1 (en) * 1999-02-09 2001-02-06 Ford Global Technologies, Inc. Method for converting exhaust gases from a diesel engine using nitrogen oxide absorbent
US6247303B1 (en) * 1997-05-16 2001-06-19 Siemens Aktiengesellschaft Method and device for removing oxidic noxious substances in an oxygen-containing exhaust gas and engine which is operated therewith
US6293097B1 (en) * 1999-08-16 2001-09-25 Ford Global Technologies, Inc. On-board reductant delivery system
US6311484B1 (en) * 2000-02-22 2001-11-06 Engelhard Corporation System for reducing NOx transient emission

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10021693C2 (de) * 2000-05-04 2003-08-07 Siemens Ag Verfahren und Vorrichtung zur Abgasreinigung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5893267A (en) * 1996-08-19 1999-04-13 The Regents Of The University Of California Catalytic reduction system for oxygen-rich exhaust
US6247303B1 (en) * 1997-05-16 2001-06-19 Siemens Aktiengesellschaft Method and device for removing oxidic noxious substances in an oxygen-containing exhaust gas and engine which is operated therewith
US6182443B1 (en) * 1999-02-09 2001-02-06 Ford Global Technologies, Inc. Method for converting exhaust gases from a diesel engine using nitrogen oxide absorbent
US6293097B1 (en) * 1999-08-16 2001-09-25 Ford Global Technologies, Inc. On-board reductant delivery system
US6311484B1 (en) * 2000-02-22 2001-11-06 Engelhard Corporation System for reducing NOx transient emission

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110146239A1 (en) * 2009-12-21 2011-06-23 Robert Bosch Gmbh Method for monitoring a pollutant conversion capacity in an exhaust gas aftertreatment system
US9222395B2 (en) 2009-12-21 2015-12-29 Robert Bosch Gmbh Method for monitoring a pollutant conversion capacity in an exhaust gas aftertreatment system

Also Published As

Publication number Publication date
DE10159849A1 (de) 2003-06-26
WO2003050399A1 (de) 2003-06-19
EP1456512A1 (de) 2004-09-15
JP2005511962A (ja) 2005-04-28

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCHALLER, JOHANNES;REEL/FRAME:016076/0678

Effective date: 20040714

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION