EP1229219A2 - Dispositif de purification des gaz d'échappement d'un moteur à combustion et procédé de fabrication - Google Patents

Dispositif de purification des gaz d'échappement d'un moteur à combustion et procédé de fabrication Download PDF

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Publication number
EP1229219A2
EP1229219A2 EP02001466A EP02001466A EP1229219A2 EP 1229219 A2 EP1229219 A2 EP 1229219A2 EP 02001466 A EP02001466 A EP 02001466A EP 02001466 A EP02001466 A EP 02001466A EP 1229219 A2 EP1229219 A2 EP 1229219A2
Authority
EP
European Patent Office
Prior art keywords
honeycomb body
washcoat
coating
longitudinal axis
liquid
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.)
Ceased
Application number
EP02001466A
Other languages
German (de)
English (en)
Other versions
EP1229219A3 (fr
Inventor
Ekkehard Dr. Pott
Michael Dr. Zillmer
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.)
Volkswagen AG
Original Assignee
Volkswagen 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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP1229219A2 publication Critical patent/EP1229219A2/fr
Publication of EP1229219A3 publication Critical patent/EP1229219A3/fr
Ceased 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
    • F01N3/10—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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds

Definitions

  • the invention relates to a device for cleaning exhaust gases Internal combustion engine according to the preamble of claim 1 and method for Manufacture of such a device according to the preambles of claims 3 and 5.
  • Modern motor vehicles generally have at least two catalytic converters, a so-called pre-catalytic converter being generally arranged directly behind the exhaust manifold. These pre-catalysts generally serve as NO x storage catalysts.
  • Such catalysts have a honeycomb body as a support structure (matrix), which carries the catalytically active layer.
  • This active layer consists of a washcoat layer, to which certain precious metals are applied.
  • the application of the Washcoats on the honeycomb body are usually done by dipping the Honeycomb body in the washcoat or by flooding the honeycomb body with the pasty washcoat.
  • This effect is particularly pronounced for gasoline engine exhaust with a high full-load residual oxygen content, because in addition to the thermal stress in the first zone of the Catalyst because of the good heat and mass transfer of the turbulent exhaust gas a disproportionately high catalytic conversion of pollutants and thus still higher energy input takes place in this catalyst zone.
  • At least one is located in the region of the end of the honeycomb body near the motor coating-free zone provided.
  • This coating-free zone means that Load on the catalyst with regard to the heat input, which is from the Heat transfer from the hot exhaust gas, and that which comes from the catalytic conversion results, at least partially decoupled.
  • the depth of the uncoated channel is reduced to the Reynolds number Matched full load. Ideally, it only becomes after the transition from turbulent to laminar Flow allows a coating within the respective channel.
  • Another object of the invention is a method for producing such To provide device.
  • the honeycomb body is immersed in coated liquid washcoat, the honeycomb body (10) not completely in the Washcoat (40) is immersed. This leaves part of the honeycomb body without Washcoat coating containing precious metals. This then forms the coating-free one Zone.
  • At least two diving operations are carried out, with the two dives the axis of the honeycomb body each different Liquid washcoat surface. This allows the shape of the coating-free zone can be defined more precisely.
  • the honeycomb body which is a plurality of each other has separate channels that extend parallel to a longitudinal axis, also coated by dipping in liquid washcoat. Part of the upper end face of the honeycomb body covered with a cover member, so that due to the air in the channels underneath the washcoat only up to a certain amount or not at all in these channels.
  • a multi-stage process is carried out, with which a more precise Definition of the coating-free zones can be achieved.
  • This method can include a variety of steps, so that any Number of coating-free zones can be generated, which in turn can have different shapes from one another.
  • FIGS. 2a and 2b The problem occurring in the prior art is shown in FIGS. 2a and 2b.
  • the four exhaust gas supply lines 31, 32, 33 and 34 combine in the collecting space 20. Exhaust pipes and plenum together form the so-called manifold. in the The example shown here forms the one flowing out of the fourth exhaust gas supply line 34 Exhaust a shot channel, so that in the subsequent catalytic converter a zone Z with high local pollution arises.
  • the problems outlined above occur.
  • the solution according to the invention is shown in FIG.
  • the honeycomb body 10 consists of a variety channels 12 parallel to one another, which are separated by channel walls 14.
  • the Channel walls 14, which are in the region of the coating-free zone 18, have the Height H no coating on.
  • the exhaust gas only flows up to this height through the channels without performing a catalytic reaction. This is true Transfer heat from the exhaust gas to the honeycomb body, but no additional Heat of reaction generated. Only below the height H does this close again coated zone 16 so that the catalytic conversion of the Exhaust gas takes place.
  • the height H should be such that it matches the route corresponds to what the exhaust gas needs to go from turbulent to laminar To flow over.
  • the catalyst which is to be produced is schematic in FIGS. 3a and 3b shown.
  • the honeycomb body is immersed in the liquid washcoat 40 parallel to its longitudinal axis AA to a first depth t 1 .
  • the longitudinal axis AA is perpendicular to the surface of the washcoat bath.
  • the axis AA can be tilted relative to the surface of the washcoat. This ensures that only the zone in the upper left corner of the honeycomb body remains uncoated.
  • Two dipping processes can also be carried out, the axis AA being perpendicular and once inclined with respect to the surface of the liquid washcoat 40.
  • This procedure is basically suitable for the production of catalysts, whose uncoated zones are said to have complex shapes.
  • An example of this is in the figures 4a and 4b.
  • This method can only be used if the honeycomb body has 10 channels 12 has that are completely separated from each other. However, this is usually the case.
  • the honeycomb body 10 is immersed in the washcoat to a first depth t 1 .
  • This cover element 51 must close the channels 12 lying beneath it in an essentially airtight and liquid-tight manner.
  • the honeycomb body 10 is now completely in the liquid Washcoat dipped.
  • the channels 12 that are not from the first Cover element 51 are covered, completely flooded. Because of the air column, which is in the covered channels, the washcoat cannot or only in these channels penetrate to a certain height. This forms below the Cover element 51 from a coating-free zone 18.
  • the cover member 51 can have any shape.
  • This embodiment is an extension of the second method example, which is expanded in that there are two separate coating-free zones 18 are generated.
  • the honeycomb body 10 is immersed in the washcoat 40 to a first depth t 1 .
  • a first area of the upper end face 10A of the honeycomb body 10 is then covered with the first cover element 51.
  • the honeycomb body 10 is lowered into the washcoat to a second depth t 2 .
  • a further part of the surface of the upper end face 10A is covered with a second cover element 52, whereupon the honeycomb body 10 is completely immersed in the washcoat.
  • FIGS. 5a and 5b two separate coating-free zones 18 with different shapes and heights have been created.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Catalysts (AREA)
  • Exhaust Gas After Treatment (AREA)
EP02001466A 2001-02-02 2002-01-22 Dispositif de purification des gaz d'échappement d'un moteur à combustion et procédé de fabrication Ceased EP1229219A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10104751A DE10104751A1 (de) 2001-02-02 2001-02-02 Vorrichtung zum Reinigen von Abgasen eines Verbrennungsmotors und Verfahren zu seiner Herstellung
DE10104751 2001-02-02

Publications (2)

Publication Number Publication Date
EP1229219A2 true EP1229219A2 (fr) 2002-08-07
EP1229219A3 EP1229219A3 (fr) 2003-05-14

Family

ID=7672651

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02001466A Ceased EP1229219A3 (fr) 2001-02-02 2002-01-22 Dispositif de purification des gaz d'échappement d'un moteur à combustion et procédé de fabrication

Country Status (2)

Country Link
EP (1) EP1229219A3 (fr)
DE (1) DE10104751A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007073807A3 (fr) * 2005-12-24 2007-08-23 Umicore Ag & Co Kg Procede de revetement catalytique de corps alveolaires ceramiques
DE102007026442A1 (de) 2007-06-06 2008-12-11 Robert Bosch Gmbh Verfahren und Vorrichtung zur Beschichtung von keramischen Körpern in der Abgastechnik mit radialer ungleichmäßiger Verteilung der Beschichtung
DE102007002903B4 (de) * 2007-01-19 2009-06-04 Süd-Chemie AG Verfahren zum Beschichten eines Katalysatorträgers
FR2941999A1 (fr) * 2009-02-12 2010-08-13 Peugeot Citroen Automobiles Sa Catalyseur pour le traitement des gaz d'echappement d'un moteur a combustion et procede d'obtention d'un tel catalyseur
DE102011018259A1 (de) * 2011-04-20 2012-10-25 Süd-Chemie AG Verfahren zur Beschichtung eines Substrates

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1541820A3 (fr) * 2003-12-11 2005-06-22 Volkswagen Aktiengesellschaft Moteur à combustion interne avec un dispositif de purification des gaz d'échappement et procédé d'opération d'un moteur à combustion interne

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4550034A (en) * 1984-04-05 1985-10-29 Engelhard Corporation Method of impregnating ceramic monolithic structures with predetermined amounts of catalyst
JPS62117633A (ja) * 1985-11-15 1987-05-29 Toyota Motor Corp モノリス触媒の製造方法
JPS637847A (ja) * 1986-06-30 1988-01-13 Toyota Motor Corp 排気ガス浄化用モノリス触媒の製造方法
DE3643785A1 (de) * 1986-12-20 1988-06-30 Opel Adam Ag Verfahren zum entgiften von verbrennungsmotor-abgasen und abgaskatalysator-vorrichtung
DE4431134C2 (de) * 1994-09-01 1997-03-06 Himmelsbach Johann Vorrichtung zur Verbesserung der Temperaturbeständigkeit von Katalysatoren für Verbrennungskraftmaschinen
US5953832A (en) * 1998-04-28 1999-09-21 Engelhard Corporation Method for drying a coated substrate
IN195165B (fr) * 1996-06-21 2005-01-28 Engelhard Corp
JP3867439B2 (ja) * 1998-06-03 2007-01-10 株式会社デンソー ハニカム構造体及びその製造方法
FR2787866B1 (fr) * 1998-12-23 2001-06-08 Applic Gaz Sa Structure de combustion catalytique, bruleur catalytique la comportant et appareil de chauffage comprenant celui-ci
DE19912846A1 (de) * 1999-03-22 2000-09-28 Emitec Emissionstechnologie Katalysatorkörper mit anströmseitig verringerter Wanddicke
JP2001000867A (ja) * 1999-06-22 2001-01-09 Nichias Corp 排ガス用触媒構造体

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007073807A3 (fr) * 2005-12-24 2007-08-23 Umicore Ag & Co Kg Procede de revetement catalytique de corps alveolaires ceramiques
CN101370583B (zh) * 2005-12-24 2010-06-16 乌米科雷股份两合公司 陶瓷蜂窝体的催化涂覆方法
US8278236B2 (en) 2005-12-24 2012-10-02 Umicore Ag & Co. Kg Method for catalytically coating ceramic honeycomb bodies
US9278347B2 (en) 2005-12-24 2016-03-08 Umicore Ag & Co. Kg Catalytically coated ceramic honeycomb bodies
DE102007002903B4 (de) * 2007-01-19 2009-06-04 Süd-Chemie AG Verfahren zum Beschichten eines Katalysatorträgers
DE102007026442A1 (de) 2007-06-06 2008-12-11 Robert Bosch Gmbh Verfahren und Vorrichtung zur Beschichtung von keramischen Körpern in der Abgastechnik mit radialer ungleichmäßiger Verteilung der Beschichtung
FR2941999A1 (fr) * 2009-02-12 2010-08-13 Peugeot Citroen Automobiles Sa Catalyseur pour le traitement des gaz d'echappement d'un moteur a combustion et procede d'obtention d'un tel catalyseur
WO2010092273A1 (fr) * 2009-02-12 2010-08-19 Peugeot Citroën Automobiles SA Catalyseur pour le traitement des gaz d'echappement d'un moteur a combustion et procede d'obtention d'un tel catalyseur
CN102317590A (zh) * 2009-02-12 2012-01-11 标致·雪铁龙汽车公司 内燃机废气处理用的催化器和制取这样一种催化器的方法
CN102317590B (zh) * 2009-02-12 2013-10-16 标致·雪铁龙汽车公司 内燃机废气处理用的催化器和制取这样一种催化器的方法
DE102011018259A1 (de) * 2011-04-20 2012-10-25 Süd-Chemie AG Verfahren zur Beschichtung eines Substrates

Also Published As

Publication number Publication date
DE10104751A1 (de) 2002-08-08
EP1229219A3 (fr) 2003-05-14

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