EP0724474A1 - Procede catalytique - Google Patents

Procede catalytique

Info

Publication number
EP0724474A1
EP0724474A1 EP95930851A EP95930851A EP0724474A1 EP 0724474 A1 EP0724474 A1 EP 0724474A1 EP 95930851 A EP95930851 A EP 95930851A EP 95930851 A EP95930851 A EP 95930851A EP 0724474 A1 EP0724474 A1 EP 0724474A1
Authority
EP
European Patent Office
Prior art keywords
catalyst
flow
catalyst body
reactor
channels
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Withdrawn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
EP95930851A
Other languages
German (de)
English (en)
Other versions
EP0724474A4 (fr
Inventor
William C. Pfefferle
Subir Roychoudhury
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.)
Precision Combustion Inc
Original Assignee
Precision Combustion Inc
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 Precision Combustion Inc filed Critical Precision Combustion Inc
Publication of EP0724474A1 publication Critical patent/EP0724474A1/fr
Publication of EP0724474A4 publication Critical patent/EP0724474A4/fr
Withdrawn legal-status Critical Current

Links

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
    • F01N3/2803—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
    • F01N3/2817—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates only with non-corrugated sheets, plates or foils
    • 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
    • F01N3/2825—Ceramics
    • F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
    • 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
    • F01N3/2835—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support fibrous
    • 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
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
    • 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
    • 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
    • F01N2330/06—Ceramic, e.g. 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/10—Fibrous material, e.g. mineral or metallic wool
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/12—Hydrocarbons

Definitions

  • This invention relates to improved catalytic converters for control of automotive emissions.
  • this invention relates to fast light-off, low pressure drop catalytic converters. It also relates to converters to achieve very high conversions.
  • the present invention not only makes possible improved catalyst utilization of rugged fast light- off catalytic converters for automotive engine exhaust control which utilize the short channel length catalysts such as those of the above cited patent and the co-pending application filed February 23. 1994 (attorney docket #2885-23), but of conventional catalytic monoliths.
  • monolith and “monolith catalyst” refer not only to conventional monolithic structures and catalysts such as employed in conventional catalytic converters but also to short channel length structures of enhanced mass transfer efficiency such as woven screens.
  • minilith refers to monolith elements having flow channels of less than three millimeters in length and more than forty channels per square centimeter.
  • catalyst brick refers to an assembly of minilith catalyst elements having channel flow passages less than three millimeters in length and having more than forty channels per square centimeter and spaced apart by monolith elements of larger channel size.
  • carbonaceous compound and "hydrocarbon” as used in the present invention refer to organic compounds and to gas streams containing fuel values in the form of compounds such as carbon monoxide, organic compounds or partial oxidation products of carbon containing compounds.
  • light-off refers to the temperature at which a catalyst achieves about fifty percent of the conversion achieved at the normal operating temperature.
  • the increased catalytic frontal area achivable with converters of the present invention allows a greater catlyst volume for a specified pressure drop, or alternatively use of much higher channel density, to achieve a greater conversion efficiency in pressure drop limited applications.
  • the catalysts of prior U.S. patent #5,051,241 and the aforementioned application filed on February 23, 1994, incorporated herein by reference thereto, are especially advantageous in the present invention.
  • Mass transfer of reactants to the surface becomes sensitive to the inlet flow rate rather than being significantly limited by the diffusion rate through a thick laminar flow boundary layer as in conventional monolith catalysts, whether ceramic or metal.
  • the amount of pollutants oxidized is essentially independent of exhaust gas flow rate and thus percent conversion decreases with increase in flow rate.
  • the amount of reactants oxidized typically increases with increase in flow rate.
  • the reaction rate can even approach the intrinsic kinetic reaction rate at the given catalyst temperature without imposing an intolerable pressure drop.
  • Conversion levels of 99.9% or even higher are achievable in an automotive converter smaller in size than a lower conversion level conventional catalytic converter. Even conversion levels high enough for abatement of toxic industrial fumes are achievable in compact reactors.
  • catalysts bricks used in the present invention allows placement of a converter close to engine exhaust ports for more rapid heatup on starting an engine at low ambient temperatures. It has also been found that channel walls as thin as 0.1 mm or even less than 0.03 mm are practical with small channel diameters thus permitting high open areas even with such small channel diameters. Thus, as many as several thousand flow channels per square centimeter or even more are feasible without reducing open area in the direction of flow below sixty percent. Open areas greater than 65, 70 or even 80 percent are feasible even with high channel density miniliths.
  • the reduced catalyst mass together with the increased heat transfer rate enables a short channel catalyst to reach operating temperature much sooner than would a conventional automotive catalyst. If placed sufficiently close to the engine exhaust manifold, a minilith catalyst element can even reach operating temperature in less than ten seconds without the need for electrical heating.
  • Many alloys are commercially available which are suitable for metal miniliths of the present invention including Haynes alloy 25, Inconel 600, and even certain stainless steels. With metal microliths, alloy selection is often determined primarily by oxidation resistance at the maximum operating temperature required by the given application.
  • the low pressure drops possible with catalytic converters based on the present invention makes it possible to utilize a large number of small diameter elements, even as many as two hundred in a one inch length, such that the converter diameter is not significantly larger than the engine exhaust pipe. This makes it much easier to place the converter catalyst at the exit of or even in the engine exhaust manifold, resulting in even faster catalyst warm up without electrical heating, and allows use of screens of different composition to achieve both hydrocarbon and NOx control. In fume abatement applications, the large number elements feasible means that it practical to achieve whatever conversion levels are needed, even as high as 99.999 or better.
  • catalytic reactors based on the present invention offer advantages in any catalytic conversion system where reactor diameter is advantageously minimized or where it is desireable to minimze catalyst bed depth.
  • Figure 1 shows a cross-sectional side view of a conventional monolith catalyst mounted in a conduit at an oblique angle to the direction of flow.
  • Figure 2 shows a cross sectional side view of a converter with an oblique mounted monolith having flow paths parallel to the direction of the flow through the converter.
  • a monolith catalyst 11 is mounted in housing 10 at an oblique angle relative to the inlet gas flow direction.
  • the catalyst is mounted at an angle of between about ten and forty degrees to the direction of flow.
  • monolith 21 has flow paths essentially parallel to the direction of converter flow in converter 20 so that fluid passing through converter 21 enters the flow channels with minimal change in direction as shown by the flow direction arrow thus allowing monolith 21 to be mounted at an oblique angle, phi, as little as five degrees. This reduces pressure losses.
  • monolith 21 is an assembly of minilith catalysts, preferrably in the form of a catalyst brick such as described in pending patent application case attorney draft 2885-23 filed on February 23, 1994. It should be noted that unlike parallel mounted catalyst beds, oblique mounting promotes a uniform fluid approach velocity across the catalyst inlet face. This is because the flow cross sectional area decreases in appoximate proportion to the flow volume.
  • a minilith catalyst of the present invention is made by vacuum sputtering platinum onto a stainless steel screen which has been cleaned by heating in air to 750K. Typically the platinum coating may be thinner than 100 angstroms but may be thicker for greater catalyst life.
  • a similarly thin layer of ceria or alumina may be deposited prior to deposition of the platinum.
  • Catalysts containing palladium, iridium, rhodium or other metals can be similarly prepared.
  • a wire screen formed from a catalytic alloy such as a platinum doped alloy
  • a catalytic alloy such as a platinum doped alloy
  • ceramic miniliths can be made such as by slicing of ceramic honeycomb extrudates prior to firing. Such ceramic honeycomb extrudates advantageously may contain an organic binder to facilitate production of thin slices.
  • ceramic miniliths are most advantageously in the form of fiber mats or screens composed of long fibers spun from any desired ceramic composition, preferably catalytic ceramics. As necessary for sufficient low temperature catalytic activity, ceramic and metal miniliths may be catalyzed using various techniques well known in the art.
  • a multi-element catalytic microlith automotive exhaust reactor having forty minilith catalyst elements of 250 flow channels per square centimeter is constructed using a five centimeter wide strip of 70% open area screening of platinum coated stainless steel wires having a diameter of 0.10 mm with each screen spaced apart by a downstream screen having four channels per square centimeter with platinum coated wires 0.25 mm in diameter with the assembly clamped between two heavier screens of 1.5 mm diameter wires having one channel per square centimeter to form a catalyst brick nominally thirty centimeters long which is mounted in a container at an oblique angle of about nine degrees to the gas flow.
  • catalyst light-off is within ten seconds of engine starting and thus exhaust emissions are controlled during initial operation of the engine.
  • a fume abatement reactor is onstructed with a catalyst brick having 100 elements of screening with about thirty 0.050 mm wires of platinum coated nichrome per centmeter (nominally 900 flow channels per square centimeter) . Each element is spaced apart from the preceeding one by a screen having nine 0.10 mm wires per centimeter.
  • the catalyst brick is mounted at an oblique angle of five degrees to the gas flow to minimize pressure drop with a minimum reactor diameter. Fumes containing 50 pp by volume of benzene in air are preheated to 700 degrees Kelvin and passed through the microlith reactor. Better than 99.9 percent conversion of the benzene to carbon dioxide and water is achieved.

Landscapes

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

Abstract

Un convertisseur catalytique pour diminuer les substances polluantes dans les gaz d'échappement comprend un catalyseur monolithique monté obliquement.
EP95930851A 1994-08-18 1995-08-16 Procede catalytique Withdrawn EP0724474A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US29236294A 1994-08-18 1994-08-18
US292362 1994-08-18
PCT/US1995/010492 WO1996005906A1 (fr) 1994-08-18 1995-08-16 Procede catalytique

Publications (2)

Publication Number Publication Date
EP0724474A1 true EP0724474A1 (fr) 1996-08-07
EP0724474A4 EP0724474A4 (fr) 1997-01-15

Family

ID=23124341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95930851A Withdrawn EP0724474A4 (fr) 1994-08-18 1995-08-16 Procede catalytique

Country Status (4)

Country Link
EP (1) EP0724474A4 (fr)
JP (1) JPH09504474A (fr)
CA (1) CA2173959A1 (fr)
WO (1) WO1996005906A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19912846A1 (de) * 1999-03-22 2000-09-28 Emitec Emissionstechnologie Katalysatorkörper mit anströmseitig verringerter Wanddicke
US20050232829A1 (en) * 2002-02-28 2005-10-20 Fuls Paul F Treatment of exhaust gases from an internal combustion engine
US7566487B2 (en) 2004-07-07 2009-07-28 Jonathan Jay Feinstein Reactor with primary and secondary channels
AT514228B1 (de) * 2013-04-15 2015-02-15 Ibiden Porzellanfabrik Frauenthal Gmbh Katalysatormodul
AT514512A1 (de) * 2013-06-19 2015-01-15 Ibiden Porzellanfabrik Frauenthal Gmbh Katalysatorreaktor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2311475A1 (de) * 1972-04-07 1973-10-11 Ford Werke Ag Mit katalytischer umsetzung arbeitende abgasreinigungsanlage fuer brennkraftmaschinen, insbesondere in kraftfahrzeugen
DE2614692A1 (de) * 1975-04-09 1976-10-14 Babcock Hitachi Kk Katalysereaktionsvorrichtung
WO1987005357A1 (fr) * 1986-03-10 1987-09-11 Sven Runo Vilhelm Gebelius Systeme d'echappement pour moteurs a combustion
EP0420462A2 (fr) * 1989-09-28 1991-04-03 Rover Group Limited Convertisseur catalytique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4407785A (en) * 1972-11-28 1983-10-04 Engelhard Corporation Method of conducting catalytically promoted gas-phase reactions
DE3823550A1 (de) * 1988-07-12 1990-01-18 Bayerische Motoren Werke Ag Fahrzeug-abgasanlage mit einem katalysatorkoerper
US5051241A (en) * 1988-11-18 1991-09-24 Pfefferle William C Microlith catalytic reaction system
US5330728A (en) * 1992-11-13 1994-07-19 General Motors Corporation Catalytic converter with angled inlet face

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2311475A1 (de) * 1972-04-07 1973-10-11 Ford Werke Ag Mit katalytischer umsetzung arbeitende abgasreinigungsanlage fuer brennkraftmaschinen, insbesondere in kraftfahrzeugen
DE2614692A1 (de) * 1975-04-09 1976-10-14 Babcock Hitachi Kk Katalysereaktionsvorrichtung
WO1987005357A1 (fr) * 1986-03-10 1987-09-11 Sven Runo Vilhelm Gebelius Systeme d'echappement pour moteurs a combustion
EP0420462A2 (fr) * 1989-09-28 1991-04-03 Rover Group Limited Convertisseur catalytique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9605906A1 *

Also Published As

Publication number Publication date
WO1996005906A1 (fr) 1996-02-29
CA2173959A1 (fr) 1996-02-29
EP0724474A4 (fr) 1997-01-15
JPH09504474A (ja) 1997-05-06

Similar Documents

Publication Publication Date Title
US5051241A (en) Microlith catalytic reaction system
EP1111212B1 (fr) Système de purification de gaz d'échappement d'un moteur à combustion interne à mélange pauvre
EP2042698B2 (fr) Dispositif de traitement d'échappement avec supports de catalyseur indépendants
US5440872A (en) Catalytic method
US5294411A (en) Honeycomb body with heatable catalytic active coating
US5466651A (en) Catalytic method
JPH04227070A (ja) モノリシック触媒転化器
US5307628A (en) Exhaust line allowing a faster triggering of the catalyst
US4065918A (en) Exhaust systems
EP1485590B1 (fr) Dispositif de traitement d'un ecoulement gazeux
JPH10176519A (ja) ディーゼルエンジン用パティキュレートトラップ
US4182120A (en) Exhaust systems
EP0669156B1 (fr) Catalyseur et procédé catalytique
WO1996005906A1 (fr) Procede catalytique
CN1195940C (zh) 柴油发动机的废气净化装置
EP1485589B1 (fr) Dispositif de traitement d'un ecoulement gazeux
US5866078A (en) Oxygen storage system
WO1996036423A1 (fr) Procede catalytique
CA1076959A (fr) Systeme d'echappement
RU2029107C1 (ru) Каталитический нейтрализатор отработавших газов двигателя внутреннего сгорания
KR20060121190A (ko) 내연 기관의 배기 가스용 컨버터
JPH06108839A (ja) 触媒コンバータ
JP2005155557A (ja) 排気ガス浄化装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

17P Request for examination filed

Effective date: 19961113

A4 Supplementary search report drawn up and despatched

Effective date: 19961127

AK Designated contracting states

Kind code of ref document: A4

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20000301