EP4013955A1 - Electrically heatable catalytic converter - Google Patents

Electrically heatable catalytic converter

Info

Publication number
EP4013955A1
EP4013955A1 EP20754216.8A EP20754216A EP4013955A1 EP 4013955 A1 EP4013955 A1 EP 4013955A1 EP 20754216 A EP20754216 A EP 20754216A EP 4013955 A1 EP4013955 A1 EP 4013955A1
Authority
EP
European Patent Office
Prior art keywords
jacket tube
electrode
electrically heatable
layer
electrically
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.)
Withdrawn
Application number
EP20754216.8A
Other languages
German (de)
French (fr)
Inventor
Sven Schepers
Peter Hirth
Thomas HÄRIG
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.)
Vitesco Technologies GmbH
Original Assignee
Vitesco Technologies 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 Vitesco Technologies GmbH filed Critical Vitesco Technologies GmbH
Publication of EP4013955A1 publication Critical patent/EP4013955A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional 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
    • 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
    • F01N3/2807—Metal other than sintered metal
    • F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • H05B3/08—Heater elements structurally combined with coupling elements or holders having electric connections specially adapted for high temperatures
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/915—Catalyst supported on particulate filters
    • B01D2255/9155—Wall flow 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/02—Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/016—Heaters using particular connecting means
    • 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 an electrically heatable catalyst with a metallic honeycomb body, the honeycomb body is formed by a plurality of wound metallic foils and the honeycomb body is taken up in a casing tube, a device for electrical contacting at least individual foils in through an opening in the casing tube the jacket pipe is guided.
  • honeycomb bodies To increase the exhaust gas temperature in devices for exhaust gas aftertreatment, electrically heatable honeycomb bodies are also used. These have a honeycomb body which is formed, for example, from a multiplicity of metallic foils which are stacked on top of one another and wound up together. For heating, the use of current-carrying conductors is known, which generate heat using the ohmic resistance. Alternatively, individual metallic foils or stacks of layers produced from them can be directly contacted electrically so that they act as current-carrying conductors and lead to heating.
  • foils are regularly combined at one of their free ends to form a compact stack in order to be able to direct the current into the foils in a targeted manner.
  • One embodiment of the invention relates to an electrically heatable catalyst with a metallic honeycomb body, the honeycomb body being formed by a plurality of rolled-up metallic foils and the honeycomb body being accommodated in a casing tube, a device for electrical contacting at least individual foils in through an opening in the casing tube the jacket tube is guided, the device being formed by an electrode which is electrically insulated from the inside of the jacket tube by a connecting layer and is mechanically connected to the jacket tube.
  • the honeycomb body is formed from a plurality of metal foils which, for example, can be smooth or structured, in particular corrugated.
  • the stacked metal foils are then preferably wound around one or more mandrels, so that a honeycomb body with a plurality of flow channels through which can flow is produced.
  • the individual flow channels are essentially formed between the corrugated and smooth metal foils.
  • the honeycomb body By spacing individual layer stacks apart, conductors that are electrically insulated from one another can be formed.
  • the honeycomb body can be heated using the ohmic resistance.
  • the stack of layers through which current flows is heated due to the electrical resistance of the metal foils forming it.
  • Exhaust gas flowing past is heated by the heated metal foils, which increases the temperature in the catalytic converter or the structures following the catalytic converter.
  • an electrical conductor must be passed through the casing tube that receives the honeycomb body.
  • the electrode which enables particularly simple contacting of the metal foils, is used for this purpose.
  • a material connection of the metal foils to the electrode for example by soldering or welding, is advantageous here in order to produce a permanently durable connection.
  • One electrical pole is usually formed by the electrode, while the other pole is formed by the housing of the catalytic converter.
  • the electrode guided through the housing or the jacket must therefore be electrically insulated from the housing or the jacket tube, while in particular it must be electrically conductively connected to the metal foils of the layer stack assigned to the electrode.
  • the electrode is firmly connected to the jacket tube in order to avoid relative movements of the electrode with respect to the jacket tube and thus also to prevent movement of the metal foils or the stack of layers.
  • the connecting layer is formed by an insulating layer and an adhesive layer, the insulating layer facing the jacket tube and the adhesive layer facing the electrode.
  • the connecting layer is ideally a multi-phase layer that on the one hand creates electrical insulation between the jacket tube and the electrode, and at the same time has an adhesive layer that enables a permanent and particularly robust connection of the electrode to the jacket pipe.
  • multi-layer connecting layers or connecting layers with specific properties in the edge area are known here. Such specific properties can be achieved, for example, by adding certain elements or mixtures of substances.
  • a preferred embodiment is characterized in that the insulating layer has an electrically insulating effect and consists of one of the substances Al2O3, Zr02, MgO, T1O2, Ce02, a ceramic doped with yttrium, a ceramic doped with silicon, cordierite, mullite or a mixture of the substances listed is formed.
  • the adhesive layer is a metallic layer and is formed from one of the materials Cu, Ni, Co, Ag, Pd or their alloys such as AgPd or CuNi.
  • the insulating layer and the adhesive layer have similar, preferably identical, coefficients of thermal expansion. This is advantageous in order to avoid stresses occurring within the connecting layer. Tensions can arise in particular as a result of the strong heating and cooling of the catalytic converter during operation.
  • the insulating layer and the adhesive layer also have similar or the same thermal expansion coefficients as the adjacent jacket or the electrode.
  • the electrode is T-shaped and the section arranged in the interior of the jacket tube has a larger cross-sectional area than the opening through which it is guided.
  • the T-shaped basic shape is advantageous in order to create a connection surface for the metal foils or the stack of layers which is larger than the opening through which the electrode is guided through the jacket tube. This makes the connection of the stack of layers easier and also prevents the creation of so-called hotspots, which can arise from a concentration of the flowing current at a certain point on the electrode or the metal foils.
  • the electrode can advantageously be guided from the inside through the jacket tube and then mechanically connected to the jacket tube before the metal foils are finally connected to the electrode.
  • connection of the electrode with the jacket tube and the metal foils with the electrode can also be achieved simultaneously in one work step, for example by soldering in a soldering furnace.
  • the jacket tube has a bulge directed radially outward in the area of the opening, the inside of the jacket tube tube-guided section of the electrode is received in one of this bulge etcbil Deten pocket.
  • the outward bulge creates a kind of cavern inside in the wall of the jacket tube, into which the T-shaped area of the electrode can be received.
  • the otherwise circular cross-section of the jacket pipe can be retained.
  • the honeycomb body formed from the metal foils does not have to be specially adapted in order to be adapted to the electrode. Of course, this also applies in the same way to honeycomb bodies and casing pipes with different cross-sections, such as an oval cross-section, for example.
  • the opening in the jacket tube is closed in a gas-tight manner by the material connection between the electrode, the insulating layer and the adhesive layer. This is particularly advantageous in order to avoid leaks. Exiting hot exhaust gases withdraw energy from the catalytic converter and can also damage the structures surrounding the catalytic converter.
  • Fig. 1 is a schematic sectional view through the electrode and the one telrohr in the area of implementation through the jacket tube, and
  • Fig. 2 is a sectional view through the contact point between jacket tube and
  • FIG. 1 shows a sectional view through a jacket tube 1 of a catalytic converter, in particular an electrically heatable catalytic converter.
  • the jacket tube 1 forms a housing for the honeycomb body 2 formed in the interior, which is formed from a plurality of metal foils which are stacked on top of one another to form stacks 3.
  • the jacket tube 1 has an opening 4 through which an electrode 5 is guided.
  • the electrode 5 has a stem-like extension which protrudes outward through the opening 4 from the interior of the jacket tube 1, and a plate-shaped section which is arranged inside the jacket tube 1.
  • the electrode 5 is T-shaped.
  • the jacket tube 1 has a bulge 6 in which the plate-shaped section of the electrode 5 is received.
  • the inwardly directed surface of the plate-shaped section of the electrode 5 is in alignment with the inner wall of the casing tube 1.
  • the plate-shaped section can also be preformed and adapted to the geometry of the inside of the casing tube 1.
  • the electrode 5 can also be adapted to an oval or some other cross section of the jacket tube 1.
  • the bulge 6 means that an envelope curve placed around the honeycomb body 2 formed in the interior can have a continuous profile and need not have a notch or other recess in the area of the electrode 5. This is particularly advantageous because the honeycomb bodies are regularly generated by winding the stack of layers around a mandrel or several mandrels.
  • the electrode 5 is mechanically and temperature-resistantly connected to the jacket tube 1 via a connecting layer 7.
  • the connecting layer 7 has an electrically insulating area 8 and an adhesive area 9.
  • the electrically insulating region 8 is arranged on the side facing the casing tube 1 and the adhesive region is arranged on the side of the connecting layer 7 facing the electrode 5.
  • a solder 10 which is used to later connect the electrode 5 to the jacket 1, can be applied to the adhesive area 9.
  • the connecting layer 7 can be formed from two individual and joined layers. Alternatively a layer can also be formed which is formed differently in the two edge regions. For example, the concentration of given elements can vary in strength in order to achieve an electrically insulating effect at an edge area.
  • a sufficiently high metallic component can be formed on the opposite edge area, which allows the connection to the electrode 5 by means of soldering. Preferred materials are described in the subclaims.
  • FIGS. 1 and 2 in particular does not have a restrictive character and serves to illustrate the inventive concept.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Toxicology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Resistance Heating (AREA)

Abstract

The invention relates to an electrically heatable catalytic converter having a metal honeycomb body (2), the honeycomb body (2) being formed by a plurality of wound metal foils and the honeycomb body (2) being held in a jacket tube (1), a device for electrically contacting at least individual foils being fed into the jacket tube (1) through an opening (4) in the jacket tube (1), the device being formed by an electrode (5), which, by means of a connecting layer (7), is electrically insulated from the interior of the jacket tube (1) and is mechanically connected to the jacket tube (1).

Description

Beschreibung description
Elektrisch beheizbarer Katalysator Electrically heated catalytic converter
Technisches Gebiet Technical area
Die Erfindung betrifft einen elektrisch beheizbaren Katalysator mit einem metalli schen Wabenkörper, wobei der Wabenkörper durch eine Mehrzahl aufgewickelter metallischer Folien gebildet ist und der Wabenkörper in einem Mantelrohr aufge nommen ist, wobei durch eine Öffnung im Mantelrohr eine Vorrichtung zur elektri schen Kontaktierung zumindest einzelner Folien in das Mantelrohr geführt ist. The invention relates to an electrically heatable catalyst with a metallic honeycomb body, the honeycomb body is formed by a plurality of wound metallic foils and the honeycomb body is taken up in a casing tube, a device for electrical contacting at least individual foils in through an opening in the casing tube the jacket pipe is guided.
Stand der Technik State of the art
Zur Erhöhung der Abgastemperatur in Vorrichtungen zur Abgasnachbehandlung werden unter anderem auch elektrisch beheizbare Wabenkörper eingesetzt. Diese weisen einen Wabenkörper auf, der beispielsweise aus einer Vielzahl von metalli schen Folien gebildet ist, die aufeinandergestapelt sind und miteinander aufgewi ckelt wurden. Zur Beheizung ist der Einsatz von stromdurchflossenen Leitern be kannt, die unter Ausnutzung des ohmschen Widerstands Wärme erzeugen. Alter nativ können einzelne metallische Folien oder daraus erzeugte Lagenstapel direkt elektrisch kontaktiert werden, so dass diese als stromdurchflossener Leiter wirken und zu einer Erwärmung führen. To increase the exhaust gas temperature in devices for exhaust gas aftertreatment, electrically heatable honeycomb bodies are also used. These have a honeycomb body which is formed, for example, from a multiplicity of metallic foils which are stacked on top of one another and wound up together. For heating, the use of current-carrying conductors is known, which generate heat using the ohmic resistance. Alternatively, individual metallic foils or stacks of layers produced from them can be directly contacted electrically so that they act as current-carrying conductors and lead to heating.
Zum Zwecke der elektrischen Kontaktierung werden regelmäßig mehrere Folien an einem ihrer freien Enden zu einem kompakten Stapel zusammengefasst, um den Strom zielgerichtet in die Folien einleiten zu können. For the purpose of electrical contact, several foils are regularly combined at one of their free ends to form a compact stack in order to be able to direct the current into the foils in a targeted manner.
Insbesondere bei elektrisch beheizbaren Wabenkörpern mit einer hohen Anzahl an einzelnen zu bestromenden Folien können so besonders massive und dicke Stapel aus Folien entstehen. Diese haben den Nachteil, dass sie einerseits bauraumseitig nicht gut in den Wabenkörper integriert werden können und weiterhin sehr anfällig für die Bildung von Heißstellen sind, da diese so gebildeten Stapel dem angelegten Strom die Möglichkeit bieten einen möglicherweise ungünstigen Stromfluss nach dem Prinzip des geringsten Widerstands auszubilden. Es kann so zu lokalen Heißstellen kommen, die dauerhaft zu einer Beschädigung führen können und weiterhin eine Verschlechterung der Energieeffizienz der Heizvorrichtung führen. Darstellung der Erfindung, Aufgabe, Lösung, Vorteile Particularly in the case of electrically heatable honeycomb bodies with a large number of individual foils to be energized, particularly massive and thick stacks of foils can thus arise. These have the disadvantage that, on the one hand, they cannot be well integrated into the honeycomb body in terms of installation space and are furthermore very susceptible to the formation of hot spots, since these stacks thus formed offer the opportunity for the applied current to develop a possibly unfavorable current flow according to the principle of least resistance . This can lead to local hot spots which can permanently lead to damage and furthermore lead to a deterioration in the energy efficiency of the heating device. Presentation of the invention, task, solution, advantages
Daher ist es die Aufgabe der vorliegenden Erfindung einen elektrisch beheizbaren Wabenkörper zu schaffen, welcher eine verbesserte Anbindung einzelner Folien an eine stromeinleitende Elektrode innerhalb des Wabenkörpers ermöglicht und das Entstehen von lokalen Heißstellen aufgrund eines ungünstigen Stromflusses ver meidet. It is therefore the object of the present invention to create an electrically heatable honeycomb body which enables an improved connection of individual foils to a current-conducting electrode within the honeycomb body and avoids the occurrence of local hot spots due to an unfavorable current flow.
Die Aufgabe hinsichtlich des elektrisch beheizbaren Katalysators wird durch einen elektrisch beheizbaren Katalysator mit den Merkmalen von Anspruch 1 gelöst. The object with regard to the electrically heatable catalytic converter is achieved by an electrically heatable catalytic converter with the features of claim 1.
Ein Ausführungsbeispiel der Erfindung betrifft einen elektrisch beheizbaren Kata lysator mit einem metallischen Wabenkörper, wobei der Wabenkörper durch eine Mehrzahl aufgewickelter metallischer Folien gebildet ist und der Wabenkörper in einem Mantelrohr aufgenommen ist, wobei durch eine Öffnung im Mantelrohr eine Vorrichtung zur elektrischen Kontaktierung zumindest einzelner Folien in das Mantelrohr geführt ist, wobei die Vorrichtung durch eine Elektrode gebildet ist, welche zur Innenseite des Mantelrohrs durch eine Verbindungsschicht elektrisch isoliert ist und mechanisch mit dem Mantelrohr verbunden ist. One embodiment of the invention relates to an electrically heatable catalyst with a metallic honeycomb body, the honeycomb body being formed by a plurality of rolled-up metallic foils and the honeycomb body being accommodated in a casing tube, a device for electrical contacting at least individual foils in through an opening in the casing tube the jacket tube is guided, the device being formed by an electrode which is electrically insulated from the inside of the jacket tube by a connecting layer and is mechanically connected to the jacket tube.
Der Wabenkörper ist aus einer Mehrzahl aus Metallfolien gebildet, die beispiels weise glatt oder strukturiert, insbesondere gewellt, sein können. Die aufeinander- gestapelten Metallfolien sind dann vorzugsweise um einen oder mehrere Dorne aufgewickelt, so dass ein Wabenkörper mit einer Mehrzahl von durchström baren Strömungskanälen entsteht. Die einzelnen Strömungskanäle sind dabei im We sentlichen zwischen den gewellten und glatten Metallfolien ausgebildet. The honeycomb body is formed from a plurality of metal foils which, for example, can be smooth or structured, in particular corrugated. The stacked metal foils are then preferably wound around one or more mandrels, so that a honeycomb body with a plurality of flow channels through which can flow is produced. The individual flow channels are essentially formed between the corrugated and smooth metal foils.
Durch die Beabstandung einzelner Lagenstapel zueinander können elektrisch voneinander isolierte Leiter ausgebildet werden. Durch das Anlegen einer elektri schen Spannung an einen oder mehrere dieser Lagenstapel kann eine Erwärmung des Wabenkörpers unter Ausnutzung des ohmschen Widerstandes erreicht wer den. Der mit Strom durchflossene Lagenstapel wird dabei aufgrund des elektrischen Widerstandes, der ihn bildenden Metallfolien erhitzt. Vorbeiströmendes Abgas wird durch die erhitzten Metallfolien mit erhitzt, wodurch die Temperatur im Katalysator oder den dem Katalysator nachfolgenden Strukturen erhöht wird. Zum Zwecke der elektrischen Kontaktierung muss ein elektrischer Leiter durch das den Wabenkörper aufnehmende Mantelrohr geführt werden. Hierzu dient die Elektrode, die eine besonders einfache Kontaktierung der Metallfolien ermöglicht. Insbesondere eine stoffschlüssige Anbindung der Metallfolien an die Elektrode, beispielsweise durch Löten oder Schweißen, ist hier vorteilhaft, um eine dauerhaft haltbare Anbindung zu erzeugen. By spacing individual layer stacks apart, conductors that are electrically insulated from one another can be formed. By applying an electrical voltage to one or more of these layer stacks, the honeycomb body can be heated using the ohmic resistance. The stack of layers through which current flows is heated due to the electrical resistance of the metal foils forming it. Exhaust gas flowing past is heated by the heated metal foils, which increases the temperature in the catalytic converter or the structures following the catalytic converter. For the purpose of making electrical contact, an electrical conductor must be passed through the casing tube that receives the honeycomb body. The electrode, which enables particularly simple contacting of the metal foils, is used for this purpose. In particular, a material connection of the metal foils to the electrode, for example by soldering or welding, is advantageous here in order to produce a permanently durable connection.
Regelmäßig wird ein elektrischer Pol durch die Elektrode gebildet, während der jeweils andere Pol durch das Gehäuse des Katalysators gebildet wird. Um sicher zugehen, dass es keinen Kurzschluss gibt, muss deswegen die durch das Gehäuse beziehungsweise den Mantel geführte Elektrode elektrisch isoliert gegenüber dem Gehäuse beziehungsweise dem Mantelrohr sein, während sie insbesondere elektrisch leitend mit den Metallfolien der der Elektrode zugeordneten Lagenstapel verbunden sein muss. One electrical pole is usually formed by the electrode, while the other pole is formed by the housing of the catalytic converter. In order to ensure that there is no short circuit, the electrode guided through the housing or the jacket must therefore be electrically insulated from the housing or the jacket tube, while in particular it must be electrically conductively connected to the metal foils of the layer stack assigned to the electrode.
Zur Sicherstellung der Dauerhaltbarkeit und zur Erhöhung der Festigkeit ist die Elektrode fest mit dem Mantelrohr verbunden, um Relativbewegungen der Elekt rode gegenüber dem Mantelrohr zu vermeiden und so auch eine Bewegung der Metallfolien beziehungsweise der Lagenstapel zu verhindern. To ensure durability and to increase strength, the electrode is firmly connected to the jacket tube in order to avoid relative movements of the electrode with respect to the jacket tube and thus also to prevent movement of the metal foils or the stack of layers.
Besonders vorteilhaft ist es, wenn eine Mehrzahl der den Wabenkörper bildenden metallischen Folien mit der Elektrode elektrisch leitend verbunden ist. Dies ist notwendig, um einen Stromfluss von der Elektrode in die Metallfolien zu ermögli chen. It is particularly advantageous if a plurality of the metallic foils forming the honeycomb body are electrically conductively connected to the electrode. This is necessary to enable current to flow from the electrode into the metal foils.
Auch ist es vorteilhaft, wenn die Verbindungsschicht durch eine Isolierschicht und eine Haftschicht gebildet ist, wobei die Isolierschicht dem Mantelrohr zugewandt ist und die Haftschicht der Elektrode zugewandt ist. Die Verbindungsschicht ist ideal erweise eine mehrphasige Schicht, die einerseits eine elektrische Isolation zwi schen dem Mantelrohr und der Elektrode erzeugt, und gleichzeitig eine Haftschicht aufweist, die eine dauerhafte und insbesondere robuste Verbindung der Elektrode mit dem Mantelrohr ermöglicht. Bekannt sind hier beispielsweise mehrlagige Ver bindungsschichten oder Verbindungsschichten mit spezifischen Eigenschaften im Randbereich. Solche spezifischen Eigenschaften können beispielsweise durch die Zugabe bestimmter Elemente oder Stoffgemische erreicht werden. Ein bevorzugtes Ausführungsbeispiel ist dadurch gekennzeichnet, dass die Iso lierschicht eine elektrisch isolierende Wirkung hat und aus einem der Stoffe AI2O3, Zr02, MgO, T1O2, Ce02, einer mit Yttrium dotierten Keramik, einer mit Silizium do tierten Keramik, Cordierit, Mullit oder einem Gemisch der aufgezählten Stoffe ge bildet ist. It is also advantageous if the connecting layer is formed by an insulating layer and an adhesive layer, the insulating layer facing the jacket tube and the adhesive layer facing the electrode. The connecting layer is ideally a multi-phase layer that on the one hand creates electrical insulation between the jacket tube and the electrode, and at the same time has an adhesive layer that enables a permanent and particularly robust connection of the electrode to the jacket pipe. For example, multi-layer connecting layers or connecting layers with specific properties in the edge area are known here. Such specific properties can be achieved, for example, by adding certain elements or mixtures of substances. A preferred embodiment is characterized in that the insulating layer has an electrically insulating effect and consists of one of the substances Al2O3, Zr02, MgO, T1O2, Ce02, a ceramic doped with yttrium, a ceramic doped with silicon, cordierite, mullite or a mixture of the substances listed is formed.
Auch ist es zu bevorzugen, wenn die Haftschicht eine metallische Schicht ist und aus einem der Stoffe Cu, Ni, Co, Ag, Pd oder deren Legierungen wie beispielsweise AgPd oder CuNi gebildet ist. It is also preferable if the adhesive layer is a metallic layer and is formed from one of the materials Cu, Ni, Co, Ag, Pd or their alloys such as AgPd or CuNi.
Darüber hinaus ist es vorteilhaft, wenn die Isolierschicht und die Haftschicht ähn liche, bevorzugt gleiche Wärmeausdehnungskoeffizienten haben. Dies ist vorteil haft, um das Auftreten von Spannungen innerhalb der Verbindungsschicht zu vermeiden. Spannungen können insbesondere infolge der starken Erwärmung und Abkühlung des Katalysators im Betrieb entstehen. Bevorzugt weisen die Isolier schicht und die Haftschicht auch ähnliche beziehungsweise gleiche Wärmeaus dehnungskoeffizienten auf, wie der benachbarte Mantel oder die Elektrode. In addition, it is advantageous if the insulating layer and the adhesive layer have similar, preferably identical, coefficients of thermal expansion. This is advantageous in order to avoid stresses occurring within the connecting layer. Tensions can arise in particular as a result of the strong heating and cooling of the catalytic converter during operation. Preferably, the insulating layer and the adhesive layer also have similar or the same thermal expansion coefficients as the adjacent jacket or the electrode.
Weiterhin ist es vorteilhaft, wenn die Elektrode T-förmig ausgebildet ist und der im Inneren des Mantelrohrs angeordnete Abschnitt eine größere Querschnittsfläche als die Öffnung aufweist, durch die sie geführt ist. Die T-förmige Grundform ist vorteilhaft, um eine Anbindungsfläche für die Metallfolien beziehungsweise die Lagenstapel zu schaffen, welche größer ist als die Öffnung, durch welche die Elektrode durch das Mantelrohr geführt ist. Dies macht die Anbindung der Lagen stapel leichter und verhindert zudem die Entstehung von sogenannten Hotspots, die durch eine Konzentration des fließenden Stroms an einer bestimmten Stelle der Elektrode oder den Metallfolien entstehen können. It is also advantageous if the electrode is T-shaped and the section arranged in the interior of the jacket tube has a larger cross-sectional area than the opening through which it is guided. The T-shaped basic shape is advantageous in order to create a connection surface for the metal foils or the stack of layers which is larger than the opening through which the electrode is guided through the jacket tube. This makes the connection of the stack of layers easier and also prevents the creation of so-called hotspots, which can arise from a concentration of the flowing current at a certain point on the electrode or the metal foils.
Die Elektrode kann vorteilhaft von Innen durch das Mantelrohr geführt werden und anschließend mit dem Mantelrohr mechanisch verbunden werden, bevor schließlich die Metallfolien an die Elektrode angebunden werden. Je nach Gestaltung des Produktionsprozesses kann die Verbindung der Elektrode mit dem Mantelrohr und der Metallfolien mit der Elektrode auch zeitgleich in einem Arbeitsschritt, bei spielsweise durch das Löten in einem Lötofen erreicht werden. The electrode can advantageously be guided from the inside through the jacket tube and then mechanically connected to the jacket tube before the metal foils are finally connected to the electrode. Depending on the design of the production process, the connection of the electrode with the jacket tube and the metal foils with the electrode can also be achieved simultaneously in one work step, for example by soldering in a soldering furnace.
Auch ist es zweckmäßig, wenn das Mantelrohr eine radial nach außen gerichtete Ausbuchtung im Bereich der Öffnung aufweist, wobei der ins Innere des Mantel- rohrs geführte Abschnitt der Elektrode in einer von dieser Ausbuchtung ausgebil deten Tasche aufgenommen ist. Die Ausbuchtung nach außen schafft im Inneren eine Art Kaverne in der Wand des Mantelrohres, in welche der T-förmige Bereich der Elektrode hinein aufgenommen werden kann. Dadurch kann der ansonsten kreisrunde Querschnitt des Mantelrohrs beibehalten werden. Weiterhin muss der aus den Metallfolien gebildete Wabenkörper nicht speziell angepasst werden, um an die Elektrode angepasst zu werden. Dies gilt natürlich in gleicher Weise auch für Wabenkörper und Mantelrohre mit abweichenden Querschnitten, wie beispiels weise einem ovalen Querschnitt. It is also useful if the jacket tube has a bulge directed radially outward in the area of the opening, the inside of the jacket tube tube-guided section of the electrode is received in one of this bulge ausgebil Deten pocket. The outward bulge creates a kind of cavern inside in the wall of the jacket tube, into which the T-shaped area of the electrode can be received. As a result, the otherwise circular cross-section of the jacket pipe can be retained. Furthermore, the honeycomb body formed from the metal foils does not have to be specially adapted in order to be adapted to the electrode. Of course, this also applies in the same way to honeycomb bodies and casing pipes with different cross-sections, such as an oval cross-section, for example.
Darüber hinaus ist es vorteilhaft, wenn die Öffnung im Mantelrohr durch die stoff schlüssige Verbindung zwischen der Elektrode, der Isolierschicht und der Haft schicht gasdicht verschlossen ist. Dies ist insbesondere vorteilhaft, um Leckagen zu vermeiden. Austretende heiße Abgase entziehen dem Katalysator einerseits Energie und können darüber hinaus zu Beschädigungen an den den Katalysator umgebenden Strukturen führen. In addition, it is advantageous if the opening in the jacket tube is closed in a gas-tight manner by the material connection between the electrode, the insulating layer and the adhesive layer. This is particularly advantageous in order to avoid leaks. Exiting hot exhaust gases withdraw energy from the catalytic converter and can also damage the structures surrounding the catalytic converter.
Vorteilhafte Weiterbildungen der vorliegenden Erfindung sind in den Unteransprü chen und in der nachfolgenden Figurenbeschreibung beschrieben. Advantageous further developments of the present invention are described in the subclaims and in the following description of the figures.
Kurze Beschreibung der Zeichnungen Brief description of the drawings
Im Folgenden wird die Erfindung anhand von Ausführungsbeispielen unter Be zugnahme auf die Zeichnungen detailliert erläutert. In den Zeichnungen zeigen: In the following, the invention is explained in detail using exemplary embodiments with reference to the drawings. In the drawings show:
Fig. 1 eine schematische Schnittansicht durch die Elektrode und das Man telrohr im Bereich der Durchführung durch das Mantelrohr, und Fig. 1 is a schematic sectional view through the electrode and the one telrohr in the area of implementation through the jacket tube, and
Fig. 2 eine Schnittansicht durch die Kontaktstelle zwischen Mantelrohr undFig. 2 is a sectional view through the contact point between jacket tube and
Elektrode, wobei die Verbindungsschicht ebenfalls dargestellt ist. Electrode, with the connection layer also shown.
Bevorzugte Ausführung der Erfindung Die Figur 1 zeigt eine Schnittansicht durch ein Mantelrohr 1 eines Katalysators, insbesondere eines elektrisch beheizbaren Katalysators. Das Mantelrohr 1 bildet ein Gehäuse für den im Inneren ausgebildeten Wabenkörper 2, der aus einer Mehrzahl von Metallfolien gebildet ist, die zu Lagenstapeln 3 aufeinandergestapelt sind. Preferred embodiment of the invention FIG. 1 shows a sectional view through a jacket tube 1 of a catalytic converter, in particular an electrically heatable catalytic converter. The jacket tube 1 forms a housing for the honeycomb body 2 formed in the interior, which is formed from a plurality of metal foils which are stacked on top of one another to form stacks 3.
Das Mantelrohr 1 weist eine Öffnung 4 auf, durch welche eine Elektrode 5 geführt ist. Im Ausführungsbeispiel der Figur 1 weist die Elektrode 5 einen stielartigen Fortsatz auf, der durch die Öffnung 4 aus dem Inneren des Mantelrohres 1 nach außen ragt, und einen plattenförmigen Abschnitt, der im Inneren des Mantelrohres 1 angeordnet ist. Die Elektrode 5 ist T-förmig ausgebildet. The jacket tube 1 has an opening 4 through which an electrode 5 is guided. In the exemplary embodiment in FIG. 1, the electrode 5 has a stem-like extension which protrudes outward through the opening 4 from the interior of the jacket tube 1, and a plate-shaped section which is arranged inside the jacket tube 1. The electrode 5 is T-shaped.
Das Mantelrohr 1 weist in der direkten Umgebung der Öffnung 4 eine Ausbuchtung 6 auf, in welcher der plattenförmige Abschnitt der Elektrode 5 aufgenommen ist. Die nach innen gerichtete Fläche des plattenförmigen Abschnitts der Elektrode 5 liegt in einer Flucht mit der Innenwandung des Mantelrohres 1. Je nach Radius des Man telrohres 1 kann der plattenförmige Abschnitt auch vorgeformt sein und an die Geometrie der Innenseite des Mantelrohre 1 angepasst sein. So kann die Elektrode 5 beispielsweise auch an einen ovalen oder einen anderweitigen Querschnitt des Mantelrohres 1 angepasst sein. In the direct vicinity of the opening 4, the jacket tube 1 has a bulge 6 in which the plate-shaped section of the electrode 5 is received. The inwardly directed surface of the plate-shaped section of the electrode 5 is in alignment with the inner wall of the casing tube 1. Depending on the radius of the telrohres 1, the plate-shaped section can also be preformed and adapted to the geometry of the inside of the casing tube 1. For example, the electrode 5 can also be adapted to an oval or some other cross section of the jacket tube 1.
Die Ausbuchtung 6 führt dazu, dass eine um den im Inneren ausgebildete Wa benkörper 2 gelegte Hüllkurve einen stetigen Verlauf aufweisen kann und keine Einkerbung oder sonstige Aussparung im Bereich der Elektrode 5 aufweisen muss. Dies ist insbesondere vorteilhaft, da die Wabenkörper regelmäßig durch das Auf wickeln der Lagenstapeln um einen Dorn oder mehrere Dorne erzeugt werden. The bulge 6 means that an envelope curve placed around the honeycomb body 2 formed in the interior can have a continuous profile and need not have a notch or other recess in the area of the electrode 5. This is particularly advantageous because the honeycomb bodies are regularly generated by winding the stack of layers around a mandrel or several mandrels.
Die Elektrode 5 ist mit dem Mantelrohr 1 mechanisch und temperaturresistent über eine Verbindungsschicht 7 verbunden. Die Verbindungsschicht 7 weist einen elektrisch isolierenden Bereich 8 und einen Haftbereich 9 auf. Der elektrisch iso lierende Bereich 8 ist auf der dem Mantelrohr 1 zugewandten Seite angeordnet und der Haftbereich auf der der Elektrode 5 zugewandten Seite der Verbindungsschicht 7. The electrode 5 is mechanically and temperature-resistantly connected to the jacket tube 1 via a connecting layer 7. The connecting layer 7 has an electrically insulating area 8 and an adhesive area 9. The electrically insulating region 8 is arranged on the side facing the casing tube 1 and the adhesive region is arranged on the side of the connecting layer 7 facing the electrode 5.
Auf den Haftbereich 9 kann ein Lot 10 aufgetragen werden, welches zur späteren Anbindung der Elektrode 5 an den Mantel 1 dient. Die Verbindungsschicht 7 kann aus zwei einzelnen und zusammengefügten Schichten gebildet sein. Alternativ kann auch eine Schicht ausgebildet sein, die in den beiden Randbereichen jeweils unterschiedlich ausgebildet ist. So kann beispielsweise die Konzentration von zu gegebenen Elementen unterschiedlich stark sein, um an einem Randbereich eine elektrisch isolierende Wirkung zu erzielen. Am gegenüberliegenden Randbereich kann ein ausreichend hoher metallischer Anteil ausgebildet sein, der die Anbindung an die Elektrode 5 mittels Löten erlaubt. Bevorzugte Materialien sind in den Un teransprüchen beschrieben. A solder 10, which is used to later connect the electrode 5 to the jacket 1, can be applied to the adhesive area 9. The connecting layer 7 can be formed from two individual and joined layers. Alternatively a layer can also be formed which is formed differently in the two edge regions. For example, the concentration of given elements can vary in strength in order to achieve an electrically insulating effect at an edge area. A sufficiently high metallic component can be formed on the opposite edge area, which allows the connection to the electrode 5 by means of soldering. Preferred materials are described in the subclaims.
Das Ausführungsbeispiel der Figuren 1 und 2 weist insbesondere keinen be- schränkenden Charakter auf und dient der Verdeutlichung des Erfindungsgedan kens. The exemplary embodiment of FIGS. 1 and 2 in particular does not have a restrictive character and serves to illustrate the inventive concept.

Claims

Patentansprüche Claims
1. Elektrisch beheizbarer Katalysator mit einem metallischen Wabenkörper (2), wobei der Wabenkörper (2) durch eine Mehrzahl aufgewickelter metallischer Folien gebildet ist und der Wabenkörper (2) in einem Mantelrohr (1) aufge nommen ist, wobei durch eine Öffnung (4) im Mantelrohr (1 ) eine Vorrichtung zur elektrischen Kontaktierung zumindest einzelner Folien in das Mantelrohr1. Electrically heatable catalyst with a metallic honeycomb body (2), wherein the honeycomb body (2) is formed by a plurality of wound metallic foils and the honeycomb body (2) is taken up in a jacket tube (1), with an opening (4) in the jacket tube (1) a device for making electrical contact with at least individual foils in the jacket tube
(1) geführt ist, d a d u r c h g e k e n n z e i c h n e t , dass die Vorrichtung durch eine Elektrode (5) gebildet ist, welche zur Innenseite des Mantelrohrs (1) durch eine Verbindungsschicht (7) elektrisch isoliert ist und mechanisch mit dem Mantelrohr (1) verbunden ist. (1), d u r c h e k e n n z e i c h n e t, that the device is formed by an electrode (5) which is electrically insulated from the inside of the jacket tube (1) by a connecting layer (7) and is mechanically connected to the jacket tube (1).
2. Elektrisch beheizbarer Katalysator nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass eine Mehrzahl der den Wabenkörper2. Electrically heatable catalyst according to claim 1, d a d u r c h g e k e n n z e i c h n e t that a plurality of the honeycomb body
(2) bildenden metallischen Folien mit der Elektrode (5) elektrisch leitend verbunden ist. (2) forming metallic foils with the electrode (5) is electrically conductively connected.
3. Elektrisch beheizbarer Katalysator nach einem der vorhergehenden An sprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Ver bindungsschicht (7) durch eine Isolierschicht (8) und eine Flaftschicht (9) gebildet ist, wobei die Isolierschicht (8) dem Mantelrohr (1 ) zugewandt ist und die Flaftschicht (9) der Elektrode (5) zugewandt ist. 3. Electrically heatable catalyst according to one of the preceding claims, characterized in that the connecting layer (7) is formed by an insulating layer (8) and a flaft layer (9), the insulating layer (8) facing the jacket tube (1) and the flake layer (9) faces the electrode (5).
4. Elektrisch beheizbarer Katalysator nach einem der vorhergehenden An sprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Iso lierschicht (8) eine elektrisch isolierende Wirkung hat und aus einem der Stoffe AI2O3, Zr02, MgO, PO2, Ce02, einer mit Yttrium dotierten Keramik, einer mit Silizium dotierten Keramik, Cordierit, Mullit oder einem Gemisch der aufgezählten Stoffe gebildet ist. 4. Electrically heatable catalyst according to one of the preceding claims, characterized in that the Iso lierschicht (8) has an electrically insulating effect and consists of one of the substances Al2O3, Zr02, MgO, PO2, Ce02, a ceramic doped with yttrium, one with silicon doped ceramic, cordierite, mullite or a mixture of the substances listed is formed.
5. Elektrisch beheizbarer Katalysator nach einem der vorhergehenden An sprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Flaft schicht (9) eine metallische Schicht ist und aus einem der Stoffe Cu, Ni, Co, Ag, Pd oder deren Legierungen wie beispielsweise AgPd oder CuNi gebildet ist. 5. Electrically heatable catalyst according to one of the preceding claims, characterized in that the flaft layer (9) is a metallic layer and is formed from one of the materials Cu, Ni, Co, Ag, Pd or their alloys such as AgPd or CuNi.
6. Elektrisch beheizbarer Katalysator nach einem der vorhergehenden An sprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Iso lierschicht (8) und die Haftschicht (9) ähnliche, bevorzugt gleiche Wär meausdehnungskoeffizienten haben. 6. Electrically heatable catalytic converter according to one of the preceding claims, stating that the insulating layer (8) and the adhesive layer (9) have similar, preferably the same thermal expansion coefficients.
7. Elektrisch beheizbarer Katalysator nach einem der vorhergehenden An sprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Elektrode (5) T-förmig ausgebildet ist und der im Inneren des Mantelrohrs (1 ) angeordnete Abschnitt eine größere Querschnittsfläche als die Öffnung (4) aufweist, durch die sie geführt ist. 7. Electrically heatable catalyst according to one of the preceding claims, characterized in that the electrode (5) is T-shaped and the inside of the jacket tube (1) arranged portion has a larger cross-sectional area than the opening (4) through which it is led.
8. Elektrisch beheizbarer Katalysator nach einem der vorhergehenden An sprüche, d a d u r c h g e k e n n z e i c h n e t , dass das Mantelrohr (1 ) eine radial nach außen gerichtete Ausbuchtung (6) im Bereich der Öffnung (4) aufweist, wobei der ins Innere des Mantelrohrs (1) geführte Abschnitt der Elektrode (5) in einer von dieser Ausbuchtung (6) ausgebil deten Tasche aufgenommen ist. 8. Electrically heatable catalyst according to one of the preceding claims, characterized in that the jacket tube (1) has a radially outwardly directed bulge (6) in the region of the opening (4), wherein the inside of the jacket tube (1) guided portion of the Electrode (5) is received in one of this bulge (6) ausgebil Deten pocket.
9. Elektrisch beheizbarer Katalysator nach einem der vorhergehenden An- Sprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Öff nung (4) im Mantelrohr (1) durch die stoffschlüssige Verbindung zwischen der Elektrode (5), der Isolierschicht (8) und der Haftschicht (9) gasdicht verschlossen ist. 9. Electrically heatable catalyst according to one of the preceding claims, characterized in that the opening (4) in the jacket tube (1) is gas-tight due to the material connection between the electrode (5), the insulating layer (8) and the adhesive layer (9) is locked.
10. Elektrisch beheizbarer Katalysator nach einem der vorhergehenden An sprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Elektrode (5) einteilig ausgeführt ist. 10. Electrically heatable catalyst according to one of the preceding claims, d u r c h g e k e n n n e i c h n e t that the electrode (5) is made in one piece.
EP20754216.8A 2019-08-13 2020-08-06 Electrically heatable catalytic converter Withdrawn EP4013955A1 (en)

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DE102019212133.0A DE102019212133B4 (en) 2019-08-13 2019-08-13 Electrically heated catalytic converter
PCT/EP2020/072150 WO2021028314A1 (en) 2019-08-13 2020-08-06 Electrically heatable catalytic converter

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EP (1) EP4013955A1 (en)
JP (1) JP2022542929A (en)
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Publication number Priority date Publication date Assignee Title
EP0456919A3 (en) * 1990-04-16 1992-01-22 W.R. Grace & Co.-Conn. Catalytic converter system
US5177961A (en) * 1991-06-26 1993-01-12 W. R. Grace & Co.-Conn. Upstream collimator for electrically heatable catalytic converter
US5526462A (en) * 1993-03-22 1996-06-11 Ngk Insulators, Ltd. Honeycomb heater with mounting means preventing axial-displacement and absorbing radial displacement
JP3305505B2 (en) * 1994-07-29 2002-07-22 日本碍子株式会社 Electrode structure
US5571485A (en) * 1994-07-29 1996-11-05 W. R. Grace & Co.-Conn. Combined electrically heatable converter body
JPH08326526A (en) * 1995-05-30 1996-12-10 Nippon Steel Corp Electrically heated metallic catalyst carrier
DE19533088A1 (en) * 1995-09-07 1997-03-13 Emitec Emissionstechnologie Electrical insulating bushing with an electrical corrosion protection device
DE19921609A1 (en) * 1999-05-10 2000-11-16 Emitec Emissionstechnologie Honeycomb body arrangement with different sections in a casing tube
DE10051562A1 (en) * 2000-10-18 2002-04-25 Emitec Emissionstechnologie Electrically heated honeycomb body used for removing hydrocarbons or nitrogen oxides from I.C. engine exhaust gases comprises two zones with different coatings arranged behind each other in the flow direction
DE102010045507A1 (en) * 2010-09-15 2012-03-15 Emitec Gesellschaft Für Emissionstechnologie Mbh Arrangement for a power supply of a component in an exhaust system
DE102012007020A1 (en) * 2012-04-05 2013-10-10 Emitec Gesellschaft Für Emissionstechnologie Mbh Electrical connection of several sheet metal layers of an electrically heatable honeycomb body and associated honeycomb body
DE102017216470A1 (en) * 2017-09-18 2019-03-21 Continental Automotive Gmbh Electrically heated heating disk for exhaust aftertreatment

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US20220161190A1 (en) 2022-05-26
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WO2021028314A1 (en) 2021-02-18
KR20220019054A (en) 2022-02-15

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