DE2557725A1 - IC vehicle engine exhaust purifier - has pipe lining of platinum catalyst on heat resisting backing material - Google Patents

IC vehicle engine exhaust purifier - has pipe lining of platinum catalyst on heat resisting backing material

Info

Publication number
DE2557725A1
DE2557725A1 DE19752557725 DE2557725A DE2557725A1 DE 2557725 A1 DE2557725 A1 DE 2557725A1 DE 19752557725 DE19752557725 DE 19752557725 DE 2557725 A DE2557725 A DE 2557725A DE 2557725 A1 DE2557725 A1 DE 2557725A1
Authority
DE
Germany
Prior art keywords
platinum catalyst
backing material
exhaust
engine exhaust
vehicle engine
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Withdrawn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
DE19752557725
Other languages
German (de)
Inventor
Rainer Dipl Ing Scholz
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.)
Audi AG
Original Assignee
Audi NSU Auto Union AG
Audi 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 Audi NSU Auto Union AG, Audi AG filed Critical Audi NSU Auto Union AG
Priority to DE19752557725 priority Critical patent/DE2557725A1/en
Publication of DE2557725A1 publication Critical patent/DE2557725A1/en
Withdrawn legal-status Critical Current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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • 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
    • F01N3/2835—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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Landscapes

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

Abstract

The backing material contains high temperature-resisting heat-insulating substances and is several mm, e.g. 3mm thick. The backing may be a wash coat of gamma-aluminium oxide contg heat-insulating glass and mineral fibres such as fibres made of SiO3, Fe2O3 and CaO. A platinum catalyst is evaporated onto the backing. The arrangement allows rapid catalytic reaction while limiting external heat radiation.

Description

Abgasentgiftungsanlage für Brennkraftmaschinen in Kraft-Exhaust gas decontamination system for internal combustion engines in

Fahrzeugen Die Erfindung bezieht sich auf eine Abgasentgiftungsanlage fiir Brennkraftmaschinen in Kraft fahrzei:igen, mit anli einem Trägermaterial und einem katalytisch wirksamen Material bestehender Beschichtung, bei der nach P 25 40 882.6 die Beschichtung an den inneren Oberflächen der Wände des Abgaskrümmers, des Abgasvorrohres und/oder des Vorschalldämpfers aufgebracht ist Eine derartige Beschichtung der genannten Abgasteile bedingt aufgrund der bei der Abgasentgiftung st;attfindenclen Reak-tionen, insbesondere der Oxydation des Kohlenmonoxides und der Kohlenwasserstoffe, eine hohe thermische Belastung des verwendeten Materials. Außerdem verursachen die stark erhitzten Abgasteile eine unerwünschte Wärmeabstrahlung und bei unmittelbarem Kontakt mit brennbaren stoffen eine erhöhte Brandgefahr (z.B.Vehicles The invention relates to an exhaust gas decontamination system for internal combustion engines in motor vehicles, with anli a carrier material and a catalytically active material existing coating, in which according to P 25 40 882.6 the coating on the inner surfaces of the walls of the exhaust manifold, of the exhaust pipe and / or the pre-silencer is applied Coating of the mentioned exhaust parts due to the exhaust gas decontamination st; occur reactions, in particular the oxidation of carbon monoxide and the hydrocarbons, a high thermal load on the material used. In addition, the highly heated exhaust gas parts cause undesirable heat radiation and in the event of direct contact with flammable substances, there is an increased risk of fire (e.g.

Grasbrand). Bekannt ist es daher, Katalysatoren mit einer wärmeisolierenden Schicht zu ummanteln. Bei Abgasentgiftungsanlagen mit Sekundärlufteinblasung in den Abgaskanal ist es auch bekannt, den Abgaskrümmer und das Abgasvorrohr zu ummanteln, wobei gegebenenfalls noch ein tragendes Blechgehäuse über der wärmeisolierenden Schicht vorgesehen sein kann. Solche Wärmeisolierungen verhindern zw.lr zufriedenstellend eine übermäßige Wärmeabstrahlung und Brandgefahr, sie sind aber relativ aufwendig und teuer und erhöhen zudem noch die thermische Belastung der Abgasteile.Grass fire). It is therefore known to use catalysts with a heat insulating Layer to coat. In exhaust gas decontamination systems with secondary air injection in The exhaust duct is also known to encase the exhaust manifold and the exhaust pipe, possibly also a supporting sheet metal housing over the heat-insulating Layer can be provided. Such thermal insulation prevents between satisfactorily excessive heat radiation and fire hazard, but they are relatively expensive and expensive and also increase the thermal load on the exhaust gas parts.

Aufgabe der Erfindung ist es, die thermische Belastung der Abgasteile und deren Wärmeabstrahlung mit relativ geringem Aufwand zu vermindern.The object of the invention is to reduce the thermal load on the exhaust gas parts and to reduce their heat radiation with relatively little effort.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Trägermaterial der Beschichtung hochtemperaturbeständige, wärmeisolierende Stoffe enthält und die Schichtdicke bis zu mehreren Millimetern beträgt. Als geeignete Wärmeisolatoren können z.B. Mikroglasfaserprodukte und Mineralfaserprodukte wie SiO3, Fe2O3 und CaO verwendet werden. Die bereits durch die Trägerschicht geschaffene Wärmeisolierung ermöglicht auch aufgrund der geringeren thermischen Belastung der Abgasteile den Einsatz kostengünstigerer Werkstoffe.According to the invention, this object is achieved in that the carrier material the coating contains high-temperature-resistant, heat-insulating substances and the Layer thickness is up to several millimeters. As suitable heat insulators e.g. micro glass fiber products and mineral fiber products such as SiO3, Fe2O3 and CaO can be used. The thermal insulation already created by the carrier layer also enables the due to the lower thermal load on the exhaust gas parts Use of cheaper materials.

Nachfolgend ist die Erfindung anhand eines schematisch dargestellten Ausführungsbeispieles näher erläutert.The invention is illustrated schematically below with the aid of one Embodiment explained in more detail.

Es zeigt: Fig. 1 eine erfindungsgemäße Abgasentgiftungsanlal;e, Fig. 2 ein Querschnitt durch das Abgasvorrohr gemäß Linie II-II der Fig. 1 im vergrößerten Maßstab.It shows: FIG. 1 an exhaust gas detoxification system according to the invention; e, FIG. 2 is a cross-section through the exhaust pipe along line II-II of FIG. 1 in an enlarged Scale.

Mit 1 ist eine Brennkraftmaschine bezeichnet, deren Abgase über einen Abgassamm@er bzw. Abgaskrümmer 2, ein Abgasvorrohr 3, einen Vorschalldämpfer 4, ein Zwischenrohr 5, einen Haupt schalldämpfer c und ein Endrohr 7 in die Atmosphäre geleitet werden. Die inneren Oberflächen der Wände des Abgaskrümmers 2, des bgasvorrohrs 3 und des Vorschalldämpfers 4 sind ca. 3 mm dick mit einem Trägermaterial 9 (siehe Fig.2) aus γ-Aluminiumoxyden, einem sog. "wash-coat" mit beigemengten, wärmeisoliwrenden Stoffen beschichtet. Dazu wurde das Trägermaterial vor dem Aufbringen auf die betreffenden Abgasteile mit wärmeisolierenden Galsfaserprodukten und Mineralfaserprodukten alls SiO3, Fe2O3 utd OaO aufgeschwemmt. Auf diese Trägerschicht wurde die katalytisch wirksame Schicht 10 aus Platin aufgedampft. Die so geschaffene Beschichtung sichert einerseits ein schnelles Ansprechen der sich rasch erhitzenden, katalytisch wirksamen Platinschicht und vermindert andererseits eine übermäßige Wärmeabstrahlung der Abgasteile nach auߣ-j.1 with an internal combustion engine is referred to, the exhaust gases via a Exhaust manifold or exhaust manifold 2, an exhaust pipe 3, a front silencer 4, an intermediate pipe 5, a main muffler c and a tail pipe 7 into the atmosphere be directed. The inner surfaces of the walls of the exhaust manifold 2, the exhaust pipe 3 and the front silencer 4 are approx. 3 mm thick with a carrier material 9 (see 2) made of γ-aluminum oxides, a so-called "wash-coat" with added, heat-insulating ends Coated fabrics. For this purpose, the carrier material was applied to the relevant Exhaust parts with heat-insulating glass fiber products and mineral fiber products all SiO3, Fe2O3 utd OaO floated up. The was catalytically applied to this carrier layer effective layer 10 vapor-deposited from platinum. The coating created in this way ensures, on the one hand, a quick response of the rapidly heating, catalytic effective platinum layer and on the other hand reduces excessive heat radiation the exhaust parts to the outside £ -j.

In einer Abwandlung (ler Erfindung kann auch zuerst eine ausreichende dicke, wärmeisolierende Schicht auf die Abgasteile aufgebracht werden, die dann mit dem Trägermaterial und einem katalytisch wirksamen Material beschichtet wird. Durch die zuletzt aufgebra':hten Schichtenlinsbeondere des sehr homogenen, katalytisbh wirksamen Materials wird auch eine Erosion der Isolaticn3stoffe vermieden, die aufgrund der schnellströmenden, gelegentlich mit Reststoffpartikeln angereicherten Abgase auftreten könnte L e e r s e i t eIn a modification (of the invention, a sufficient thick, heat-insulating layer can be applied to the exhaust parts, which then is coated with the carrier material and a catalytically active material. Due to the layered lenses applied last of the very homogeneous, catalytic layer The effective material also avoids the erosion of the isolatic substances caused by the fast-flowing exhaust gases that are occasionally enriched with residual particles could occur L e r s e i t e

Claims (1)

Patentanspruch Abgasentgiftungsaiiiage für Brennkraftmaschinen in Kraftfahrzeugen mit aus einem Trägermaterial und einem katalytisch wirksamen Material bestehender Beschichtung, bei der nach P 25 40 882.6 die Beschichtung an den inneren Oberflächen der Wände des Abgaskrümmers, des Abgasvorrohres und/oder des Vorschalldämpfers aufgebracht ist, dadurch gekennzeichnet, daß das Trägermaterial der Beschichtung hochtemperaturbeständige, wärmeisolierende Stoffe enthält und die Schichtdicke bis zu mehreren Millimetern beträgt. Claim exhaust gas detoxification aiiage for internal combustion engines in Motor vehicles with a carrier material and a catalytically active material existing coating, in which according to P 25 40 882.6 the coating on the inner Surfaces of the walls of the exhaust manifold, the exhaust pipe and / or the pre-silencer is applied, characterized in that the carrier material of the coating contains high temperature resistant, heat insulating substances and the layer thickness up to to several millimeters.
DE19752557725 1975-12-20 1975-12-20 IC vehicle engine exhaust purifier - has pipe lining of platinum catalyst on heat resisting backing material Withdrawn DE2557725A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752557725 DE2557725A1 (en) 1975-12-20 1975-12-20 IC vehicle engine exhaust purifier - has pipe lining of platinum catalyst on heat resisting backing material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752557725 DE2557725A1 (en) 1975-12-20 1975-12-20 IC vehicle engine exhaust purifier - has pipe lining of platinum catalyst on heat resisting backing material

Publications (1)

Publication Number Publication Date
DE2557725A1 true DE2557725A1 (en) 1977-06-23

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ID=5965111

Family Applications (1)

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DE19752557725 Withdrawn DE2557725A1 (en) 1975-12-20 1975-12-20 IC vehicle engine exhaust purifier - has pipe lining of platinum catalyst on heat resisting backing material

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0718027A1 (en) * 1994-12-20 1996-06-26 Hitachi, Ltd. Catalyst-containing heat-insulated member and gas turbine provided with the same
WO1997040266A2 (en) * 1996-04-19 1997-10-30 Engelhard Corporation System for reduction of harmful exhaust emissions from diesel engines
US6006516A (en) * 1996-04-19 1999-12-28 Engelhard Corporation System for reduction of harmful exhaust emissions from diesel engines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0718027A1 (en) * 1994-12-20 1996-06-26 Hitachi, Ltd. Catalyst-containing heat-insulated member and gas turbine provided with the same
WO1997040266A2 (en) * 1996-04-19 1997-10-30 Engelhard Corporation System for reduction of harmful exhaust emissions from diesel engines
WO1997040266A3 (en) * 1996-04-19 1998-01-15 Engelhard Corp System for reduction of harmful exhaust emissions from diesel engines
US6006516A (en) * 1996-04-19 1999-12-28 Engelhard Corporation System for reduction of harmful exhaust emissions from diesel engines
US6256984B1 (en) * 1996-04-19 2001-07-10 Engelhard Corporation System for reduction of harmful exhaust emissions from diesel engines

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