CH678020A5 - Diesel motor catalyst filter - has channels with electric heating to give reaction temp. for catalyst action - Google Patents

Diesel motor catalyst filter - has channels with electric heating to give reaction temp. for catalyst action Download PDF

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Publication number
CH678020A5
CH678020A5 CH127/89A CH12789A CH678020A5 CH 678020 A5 CH678020 A5 CH 678020A5 CH 127/89 A CH127/89 A CH 127/89A CH 12789 A CH12789 A CH 12789A CH 678020 A5 CH678020 A5 CH 678020A5
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CH
Switzerland
Prior art keywords
filter
channels
electrically conductive
coated
temperature
Prior art date
Application number
CH127/89A
Other languages
German (de)
Inventor
Max Angleitner
Original Assignee
Neco 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 Neco Ag filed Critical Neco Ag
Priority to CH127/89A priority Critical patent/CH678020A5/en
Publication of CH678020A5 publication Critical patent/CH678020A5/en

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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
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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

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

Abstract

The filter to clean gases, by afterburning, has channels passing through with electrically conductive walls to give at least a partial catalyst action at reaction temps. on the gas flowing through. At least a number of the channels are connected so that there is a flow through from front to back, and the channels are coated with a catalyst material. The filter is a ceramic foam or honeycomb structure which is generally electrically conductive, or the channel walls are conductive. The pref. filter materials are of ceramics, especially SiC and/or metal oxides e.g. Al2O3 or ZrO2, or the filter is generally a ceramic or glass structure. ADVANTAGE - Designed partic. for diesel motor assemblies, the filter unit is easily heated to the required temp. without harmful emissions.

Description

       

  
 



  Die vorliegende Erfindung betrifft ein Filter zur Reinigung von Gasen durch Nachverbrennung, sowie eine Dieselmotoranlage mit Filter, welches an die Gleichstromversorgung der Anlage angeschlossen ist. 



  Filter, auch Dieselrussfilter, sind bekannt. Im Gegensatz zu gemeinhin bekannten Filtern arbeiten Dieselrussfilter für Dieselmaschinen so, dass die Russpartikel an Filterflächen abgefangen werden und an diesen Flächen bei erhöhter Temperatur, evt. katalytisch, verbrannt werden. 



  Es sind verschiedene Filtermaterialien und -formen sowie verschiedene Katalysatoren bekannt. 



  Allgemein bekannt sind die Wabenkörper aus Keramik, wobei die Wabenenden alternierend geschlossen sind, so dass das Abgas immer die Wabenseitenflächen durchströmen muss. 



  Ein anderes Filtermaterial ist beispielsweise unter der Marke CERAPOR bekannt, welches zum Filtrieren von geschmolzenen Metallen oder zum Filtern heisser Gase Verwendung findet. Dieses porige Material wird ein- oder mehrschichtig ausgeführt, wobei die einzelnen  Schichten annähernd gleiche Porengrössen besitzen, die von Schicht zu Schicht variieren. 



  Um die sich primär auf der Keramik absetzenden Russpartikel verbrennen zu können, muss der katalytisch beschichtete Körper eine Temperatur von ca. 300 DEG C haben, da sonst die Verbrennung nicht einsetzt. 



  Bei zu kaltem Abgas und/oder zu kaltem Katalysator, was kurz nach dem Start oder bei nicht vollastigem Betrieb der Fall ist, arbeitet die katalytische Verbrennung nicht, und es kommt zur Verstopfung des Filters oder zum Ausstoss des ungereinigten Abgases, d.h. zur Russbildung. 



  Um die nötige Temperatur im Filter zu erreichen oder zu halten, wird der Filter entweder durch elektrische Heizstäbe geheizt oder durch eine Zusatzfeuerung, durch zusätzliches Verbrennen von Treibstoff, auf die nötige Temperatur gebracht oder dort gehalten. 



  Diese Verfahren sind aufwendig und, z.B. im Falle der Zusatzheizung durch Kraftstoff, umweltschädlich und energieaufwendig. 



  Gegenstand der Erfindung ist es, diese Nachteile zu vermeiden und die Technik zu vereinfachen. 



  In diesem Sinne zeichnet sich das erfindungsgemässe Filter bzw. eine Dieselmotoranlage mit Filter durch den kennzeichnenden Teil der Ansprüche 1 bzw. 8 aus. 



  Die Erfindung wird anschliessend beispielsweise erläutert. 



  Ein erfindungsgemässes Filter, insbesondere ein Dieselrussfilter, besteht im wesentlichen aus offenporiger Schaumkeramik mit definierter Porengrösse oder aus den bekannten Wabenkörpern. Die Kanäle können in jeder beliebigen anderen Form ausgeführt sein. Die Körper sind aus keramischem Material oder aus Oxiden bestehend, welche katalytisch beschichtet sind oder welche als solche selbst katalytisch wirken. Zusätzlich sind sie elektrisch leitend beschichtet oder sind selbst elektrisch leitend. Sie haben einen relativ hohen ohmschen Widerstand. 



  Das leitfähige Filter mit dem berechneten ohmschen Widerstand wird an das Stromnetz der Maschine angeschlossen. Der erhöhte Stromverbrauch wird durch eine verstärkte Batterie und eine verstärkte Lichtmaschine der Motoranlage sichergestellt. 



  Die Kontaktstellen sind entweder radial oder an den flachen Seilen der meist zylindrischen Filterkörper angeordnet. Die jeweils günstigsten Kontaktierungsstellen ergeben sich aus der Form der Körper. 



   Durch Anschluss an das Stromnetz erhitzt sich das Filter sehr schnell auf seiner gesamten, katalytisch wirksamen Oberfläche. Sobald die nötige Temperatur erreicht ist, wird die Maschine automatisch gestartet. Bei auftretenden Störungen kann die Maschine auch ohne funktionsfähiges Filter gestartet werden,  wobei dann aber eine Kontrolleuchte die Störung anzeigt. Bei Erreichen der nötigen Temperatur schaltet die Stromzuführung automatisch ab und springt bei Unterschreiten eines vorgegebenen Grenzwertes sofort wieder an. Das Regelverhalten bei minimalem Überschwingen wird prozessorgesteuert. 



  Als leitfähiges temperaturstabiles Material mit hohem elektrischem Widerstand kann SiC verwendet werden. Filter aus anderen Materialien, wie z.B. Al2O3, ZrO2, Gläser, Keramiken etc., werden elektrisch leitend beschichtet. 



  
 



  The present invention relates to a filter for cleaning gases by post-combustion, and a diesel engine system with filter, which is connected to the DC power supply of the system.



  Filters, also known as diesel soot filters, are known. In contrast to commonly known filters, diesel soot filters for diesel machines work in such a way that the soot particles are caught on filter surfaces and are burned on these surfaces at elevated temperatures, possibly catalytically.



  Various filter materials and shapes as well as various catalysts are known.



  The honeycomb bodies made of ceramic are generally known, the honeycomb ends being alternately closed, so that the exhaust gas must always flow through the honeycomb side surfaces.



  Another filter material is known, for example, under the CERAPOR brand, which is used for filtering molten metals or for filtering hot gases. This porous material is made up of one or more layers, the individual layers having approximately the same pore sizes, which vary from layer to layer.



  In order to be able to burn the soot particles that settle primarily on the ceramic, the catalytically coated body must have a temperature of approx. 300 ° C, otherwise the combustion will not start.



  If the exhaust gas is too cold and / or the catalyst is too cold, which is the case shortly after starting or if the operation is not under full load, the catalytic combustion does not work and the filter is clogged or the unpurified exhaust gas is ejected, i.e. for soot formation.



  In order to reach or maintain the required temperature in the filter, the filter is either heated by electric heating elements or brought to the required temperature or kept there by additional firing, by additional burning of fuel.



  These processes are complex and, e.g. in the case of additional heating by fuel, harmful to the environment and energy-intensive.



  The object of the invention is to avoid these disadvantages and to simplify the technology.



  In this sense, the filter according to the invention or a diesel engine system with filter is characterized by the characterizing part of claims 1 and 8, respectively.



  The invention is subsequently explained, for example.



  A filter according to the invention, in particular a diesel soot filter, essentially consists of open-pore foam ceramic with a defined pore size or of the known honeycomb bodies. The channels can be designed in any other form. The bodies are made of ceramic material or of oxides, which are coated catalytically or which as such themselves have a catalytic effect. In addition, they are coated in an electrically conductive manner or are themselves electrically conductive. They have a relatively high ohmic resistance.



  The conductive filter with the calculated ohmic resistance is connected to the machine's power supply. The increased power consumption is ensured by a reinforced battery and an alternator in the engine system.



  The contact points are arranged either radially or on the flat ropes of the mostly cylindrical filter bodies. The most favorable contact points result from the shape of the body.



   When connected to the mains, the filter heats up very quickly on its entire, catalytically active surface. As soon as the required temperature is reached, the machine starts automatically. In the event of malfunctions, the machine can also be started without a functional filter, but then a control lamp indicates the malfunction. When the required temperature is reached, the power supply switches off automatically and starts up again when the temperature falls below a specified limit. The control behavior with minimal overshoot is processor-controlled.



  SiC can be used as a conductive, temperature-stable material with high electrical resistance. Filters made of other materials, e.g. Al2O3, ZrO2, glasses, ceramics etc. are coated in an electrically conductive manner.

Claims (10)

1. Filter zur Reinigung von Gasen durch Nachverbrennung, dadurch gekennzeichnet, dass es von Kanälen durchsetzt ist, deren vom Gas bestrichenen Wände bei Reaktionstemperaturen mindestens teilweise katalytisch wirken und welche elektrisch leitend sind.       1. Filter for cleaning gases by post-combustion, characterized in that it is penetrated by channels, the walls of which the gas-coated walls act at least partially catalytically at reaction temperatures and which are electrically conductive. 2. Filter nach Anspruch 1, dadurch gekennzeichnet, dass mindestens eine Anzahl der Kanäle unter sich verbunden ist, um strömungsmässig deren Hintereinanderschaltung sicherzustellen. 2. Filter according to claim 1, characterized in that at least a number of the channels is connected to each other in order to ensure their flow connection in terms of flow. 3. Filter nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Kanäle mit Katalytmaterial beschichtet sind. 3. Filter according to claim 1 or 2, characterized in that the channels are coated with catalytic material. 4. Filter nach einem der Ansprüche 1-3, dadurch gekennzeichnet, dass das Filter als Träger einen offenporigen Schaum/Keramikstoff aufweist oder der Träger als Wabenkörper ausgebildet ist. 4. Filter according to any one of claims 1-3, characterized in that the filter has an open-pore foam / ceramic as the carrier or the carrier is designed as a honeycomb body. 5. 5. Filter nach einem der An sprüche 1-4, dadurch gekennzeichnet, dass es im wesentlichen katalytisch wirksamen Baustoff aufweist, welcher vorzugsweise elektrisch leitend ist oder dessen Kanalwände mit elektrisch leitendem Material beschichtet sind. Filter according to one of claims 1-4, characterized in that it has essentially catalytically active building material, which is preferably electrically conductive or the channel walls are coated with electrically conductive material. 6. Filter nach einem der Ansprüche 1-5, dadurch gekennzeichnet, dass das Filter im wesentlichen aus keramischem Material, z.B. SiC und- oder Metalloxyden, z.B. Al2O3 oder ZrO2 besteht. 6. Filter according to one of claims 1-5, characterized in that the filter consists essentially of ceramic material, e.g. SiC and or metal oxides, e.g. Al2O3 or ZrO2 exists. 7. Filter nach einem der Ansprüche 1-5, dadurch gekennzeichnet, dass das Filter im wesentlichen aus Keramiken oder Gläsern besteht. 7. Filter according to any one of claims 1-5, characterized in that the filter consists essentially of ceramics or glasses. 8. 8th. Dieselmotoranlage mit Filter, zum Reinigen von Abgasen durch Nachverbrennung nach einem der Ansprüche 1-7, welches an die Gleichstromversorgung der Anlage angeschlossen ist, gekennzeichnet durch einen Temperaturüberwacher am Filter, welcher zur Inbetriebsetzung des Motors das Filter elektrisch aufheizen lässt und bei Erreichung der katalytisch wirksamen Kanalwandtemperatur der Filterkanäle den Starter des Motors einschaltet. Diesel engine system with filter, for cleaning exhaust gases by post-combustion according to one of claims 1-7, which is connected to the direct current supply of the system, characterized by a temperature monitor on the filter, which allows the filter to heat up electrically when the engine is started and when the catalytically effective ones are reached Channel wall temperature of the filter channels switches on the motor starter. 9. Dieselmotoranlage nach Anspruch 8, gekennzeichnet durch ein Kontrollelement, z.B. eine Leuchte, um das Nichterreichen der katalytisch wirksamen Kanalwandtemperatur anzuzeigen. 9. Diesel engine system according to claim 8, characterized by a control element, e.g. a light to indicate that the catalytic channel wall temperature has not been reached. 10. 10th Dieselmotoranlage nach Anspruch 8 oder 9, gekennzeichnet durch einen ersten Temperatur-Grenzschalter, um die Stromversorgung zum Aufheizen des Filters bei Erreichen einer, z.B. einstellbaren Temperatur zu unterbrechen bzw. nach Unterschreiten einer zweiten Temperaturgrenze die elektrische Stromzufuhr einzuschalten. 1. Filter zur Reinigung von Gasen durch Nachverbrennung, dadurch gekennzeichnet, dass es von Kanälen durchsetzt ist, deren vom Gas bestrichenen Wände bei Reaktionstemperaturen mindestens teilweise katalytisch wirken und welche elektrisch leitend sind. 2. Filter nach Anspruch 1, dadurch gekennzeichnet, dass mindestens eine Anzahl der Kanäle unter sich verbunden ist, um strömungsmässig deren Hintereinanderschaltung sicherzustellen. 3. Filter nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Kanäle mit Katalytmaterial beschichtet sind. 4. Filter nach einem der Ansprüche 1-3, dadurch gekennzeichnet, dass das Filter als Träger einen offenporigen Schaum/Keramikstoff aufweist oder der Träger als Wabenkörper ausgebildet ist. 5.  Diesel engine system according to claim 8 or 9, characterized by a first temperature limit switch to the power supply for heating the filter when a, e.g. interrupt adjustable temperature or switch on the electrical power supply after falling below a second temperature limit.       1. Filter for cleaning gases by post-combustion, characterized in that it is penetrated by channels, the walls of which the gas-coated walls act at least partially catalytically at reaction temperatures and which are electrically conductive. 2. Filter according to claim 1, characterized in that at least a number of the channels is connected to each other in order to ensure their flow connection in terms of flow. 3. Filter according to claim 1 or 2, characterized in that the channels are coated with catalytic material. 4. Filter according to any one of claims 1-3, characterized in that the filter has an open-pore foam / ceramic as the carrier or the carrier is designed as a honeycomb body. 5. Filter nach einem der An sprüche 1-4, dadurch gekennzeichnet, dass es im wesentlichen katalytisch wirksamen Baustoff aufweist, welcher vorzugsweise elektrisch leitend ist oder dessen Kanalwände mit elektrisch leitendem Material beschichtet sind. 6. Filter nach einem der Ansprüche 1-5, dadurch gekennzeichnet, dass das Filter im wesentlichen aus keramischem Material, z.B. SiC und- oder Metalloxyden, z.B. Al2O3 oder ZrO2 besteht. 7. Filter nach einem der Ansprüche 1-5, dadurch gekennzeichnet, dass das Filter im wesentlichen aus Keramiken oder Gläsern besteht. 8. Filter according to one of claims 1-4, characterized in that it has essentially catalytically active building material, which is preferably electrically conductive or the channel walls are coated with electrically conductive material. 6. Filter according to one of claims 1-5, characterized in that the filter consists essentially of ceramic material, e.g. SiC and or metal oxides, e.g. Al2O3 or ZrO2 exists. 7. Filter according to any one of claims 1-5, characterized in that the filter consists essentially of ceramics or glasses. 8th. Dieselmotoranlage mit Filter, zum Reinigen von Abgasen durch Nachverbrennung nach einem der Ansprüche 1-7, welches an die Gleichstromversorgung der Anlage angeschlossen ist, gekennzeichnet durch einen Temperaturüberwacher am Filter, welcher zur Inbetriebsetzung des Motors das Filter elektrisch aufheizen lässt und bei Erreichung der katalytisch wirksamen Kanalwandtemperatur der Filterkanäle den Starter des Motors einschaltet. 9. Dieselmotoranlage nach Anspruch 8, gekennzeichnet durch ein Kontrollelement, z.B. eine Leuchte, um das Nichterreichen der katalytisch wirksamen Kanalwandtemperatur anzuzeigen. 10. Diesel engine system with filter, for cleaning exhaust gases by post-combustion according to one of claims 1-7, which is connected to the direct current supply of the system, characterized by a temperature monitor on the filter, which allows the filter to heat up electrically when the engine is started and when the catalytically effective ones are reached Channel wall temperature of the filter channels switches on the motor starter. 9. Diesel engine system according to claim 8, characterized by a control element, e.g. a light to indicate that the catalytic channel wall temperature has not been reached. 10th Dieselmotoranlage nach Anspruch 8 oder 9, gekennzeichnet durch einen ersten Temperatur-Grenzschalter, um die Stromversorgung zum Aufheizen des Filters bei Erreichen einer, z.B. einstellbaren Temperatur zu unterbrechen bzw. nach Unterschreiten einer zweiten Temperaturgrenze die elektrische Stromzufuhr einzuschalten.  Diesel engine system according to claim 8 or 9, characterized by a first temperature limit switch to the power supply for heating the filter when a, e.g. interrupt adjustable temperature or switch on the electrical power supply after falling below a second temperature limit.  
CH127/89A 1989-01-16 1989-01-16 Diesel motor catalyst filter - has channels with electric heating to give reaction temp. for catalyst action CH678020A5 (en)

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CH127/89A CH678020A5 (en) 1989-01-16 1989-01-16 Diesel motor catalyst filter - has channels with electric heating to give reaction temp. for catalyst action

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992017692A1 (en) * 1991-03-28 1992-10-15 Roth-Technik Gmbh & Co. Forschung Für Automobil- Und Umwelttechnik Catalytic converter
EP0529368A2 (en) * 1991-08-26 1993-03-03 Kabushiki Kaisha Toshiba Catalytic combustion apparatus and method
EP0572827A1 (en) * 1992-06-03 1993-12-08 Corning Incorporated Heated cellular substrates
US5277937A (en) * 1992-06-03 1994-01-11 Corning Incorporated Method for controlling the conductance of a heated cellular substrate
US5393499A (en) * 1992-06-03 1995-02-28 Corning Incorporated Heated cellular substrates
WO1995015431A1 (en) * 1993-11-30 1995-06-08 Emitec Gesellschaft Für Emissionstechnologie Mbh Process for reducing pollutant emissions of a diesel engine equipped with an oxidation-type catalytic converter
US5764850A (en) * 1996-04-04 1998-06-09 Phoenix Solutions Co. Silicon carbide foam electric heater for heating gas directed therethrough

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992017692A1 (en) * 1991-03-28 1992-10-15 Roth-Technik Gmbh & Co. Forschung Für Automobil- Und Umwelttechnik Catalytic converter
EP0529368A2 (en) * 1991-08-26 1993-03-03 Kabushiki Kaisha Toshiba Catalytic combustion apparatus and method
EP0529368A3 (en) * 1991-08-26 1993-05-26 Kabushiki Kaisha Toshiba Catalytic combustion apparatus and method
US5421719A (en) * 1991-08-26 1995-06-06 Kabushiki Kaisha Toshiba Catalytic combustion apparatus and method
EP0572827A1 (en) * 1992-06-03 1993-12-08 Corning Incorporated Heated cellular substrates
US5277937A (en) * 1992-06-03 1994-01-11 Corning Incorporated Method for controlling the conductance of a heated cellular substrate
US5393499A (en) * 1992-06-03 1995-02-28 Corning Incorporated Heated cellular substrates
US5409668A (en) * 1992-06-03 1995-04-25 Corning Incorporated Method for controlling the conductance of a heated cellular substrate
WO1995015431A1 (en) * 1993-11-30 1995-06-08 Emitec Gesellschaft Für Emissionstechnologie Mbh Process for reducing pollutant emissions of a diesel engine equipped with an oxidation-type catalytic converter
US5839273A (en) * 1993-11-30 1998-11-24 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Method for reducing pollutant emissions of a diesel engine with a downstream oxidation-type catalytic converter
US5764850A (en) * 1996-04-04 1998-06-09 Phoenix Solutions Co. Silicon carbide foam electric heater for heating gas directed therethrough

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