DE2209488A1 - ELASTIC SUPPORT FOR MONOLITHIC CATALYST BODY - Google Patents

ELASTIC SUPPORT FOR MONOLITHIC CATALYST BODY

Info

Publication number
DE2209488A1
DE2209488A1 DE19722209488 DE2209488A DE2209488A1 DE 2209488 A1 DE2209488 A1 DE 2209488A1 DE 19722209488 DE19722209488 DE 19722209488 DE 2209488 A DE2209488 A DE 2209488A DE 2209488 A1 DE2209488 A1 DE 2209488A1
Authority
DE
Germany
Prior art keywords
ceramic
ceramic body
monolithic catalyst
catalyst body
firmly
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Withdrawn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
DE19722209488
Other languages
German (de)
Inventor
Reimar Dipl Ing Musall
Wilhelm Dipl Ing Wolsing
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.)
Kali Chemie AG
Original Assignee
Kali Chemie 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 Kali Chemie AG filed Critical Kali Chemie AG
Priority to DE19722209488 priority Critical patent/DE2209488A1/en
Priority to NL7302006A priority patent/NL7302006A/xx
Priority to US333714A priority patent/US3891396A/en
Priority to CA164,072A priority patent/CA983279A/en
Priority to FR7306779A priority patent/FR2174065B1/fr
Priority to SE7302725A priority patent/SE384066B/en
Priority to IT2092473A priority patent/IT979533B/en
Priority to JP2418673A priority patent/JPS5618770B2/ja
Publication of DE2209488A1 publication Critical patent/DE2209488A1/en
Priority to GB908073*[A priority patent/GB1415939A/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Withdrawn legal-status Critical Current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
    • 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
    • F01N3/2875—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration by using elastic means, e.g. spring leaves, for retaining catalyst body in the housing
    • 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
    • F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/10—Exhaust treating devices having provisions not otherwise provided for for avoiding stress caused by expansions or contractions due to temperature variations
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/12—Tubes being corrugated
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Landscapes

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

Description

Elastische Halterung für monolithische Katalysatorkörper Gegenstand der Erfindung ist eine elastische Halterung für monolithische Katalysatorkörper, bestehend aus einem Wellrohr 1, das gleichzeitig Außenwand einer Abgasleitung und fest mit den Flanschen 4 und 6 verbunden is-t, einem einseitig an diesem befestigten Metallrohr 8, einem rohrförmigen, außen konisch ausgebildeten keramischen Körper 2, der mit dem monolithischen Katalysatorkörper 7 fest verbunden ist und der an Flansch 6 fest anliegt, einer auf dem zylindrischen Teil des keramischen Körpers 2 verschiebbaren Scheibe 5 und einer verdichtbaren keramischen Packung 3, die sich in dem Ringspalt 9 zwischen Metallrohr 8 und Keramikkörper 2 befindet und die den Keramikkörper 2 infolge der dem Wellrohr 1 aufgebrachten Vorspannung am Umfang elastisch einspannt. Elastic holder for monolithic catalyst body object the invention is an elastic holder for monolithic catalyst bodies, consisting of a corrugated pipe 1, which is at the same time the outer wall of an exhaust pipe and is firmly connected to the flanges 4 and 6, one attached to one side Metal tube 8, a tubular, externally conical ceramic body 2, which is firmly connected to the monolithic catalyst body 7 and to Flange 6 rests firmly, one on the cylindrical part of the ceramic body 2 sliding disc 5 and a compressible ceramic packing 3, which located in the annular gap 9 between metal tube 8 and ceramic body 2 and the Ceramic body 2 is elastic on the circumference as a result of the bias applied to the corrugated tube 1 clamped.

Wegen ihres geringen Strömungswiderstandes und ihrer großen Oberfläche pro Volumeneinheit hat man immer wieder versucht, monolithische keramische Wabenkörper als Katalysatorträger in Vorrichtungen zur Reinigung von Abgasen, insbesondere von Autoabgasen einzubauen. Das Problem dabei ist ihre elastische Lagerung.Because of their low flow resistance and their large surface attempts have been made again and again to produce monolithic ceramic honeycomb bodies per unit volume As a catalyst carrier in devices for cleaning exhaust gases, in particular from To install car exhaust. The problem with this is their elastic support.

Durch die beim Fahren auftretenden Stöße und Vibrationen werden die Wabenkörper mechanisch stark beansprucht, so daß es schließlich zu einer Zerstörung des Katalysatorträgers kommen kann.The shocks and vibrations that occur while driving reduce the The honeycomb body is mechanically highly stressed, so that it ultimately leads to destruction of the catalyst carrier can come.

Es sind daher bereits elastische Halterungen für solche Wabenkörper vorgeschlagen worden. So wird in der US-Patentschrift 3 441 382 eine Katalysatorpatrone beschrieben, die aus einem keramischen monolithischen Katalysatorelement besteht, das in einem Metallgehäuse untergebracht ist, wobei sich zwischen dem Katalysator und dem Gehäuse eine Wärmeisoliermasse, wie z. B.There are therefore already elastic mountings for such honeycomb bodies has been proposed. For example, US Pat. No. 3,441,382 discloses a catalyst cartridge described, which consists of a ceramic monolithic catalyst element, which is housed in a metal housing, with the catalyst and the housing a heat insulating compound, such as. B.

feuerfeste Ziegel, geschmolzenes K-Aluminiumoxid usw. befindet.refractory bricks, fused K-alumina, etc.

Mittels einer Metallfeder, die verstellbar ist, wird auf die Isoliermasse ein Druck ausgeübt, so daß der Katalysatorkörper in seiner Stellung festgehalten wird. Eine solche Halterung hat sich jedoch als nicht elastisch genug erwiesen. Der auf den Katalysator ausgeübte Druck ist zu groß und nicht gleichmäßig genug verteilt, um eine allmähliche mechanische Zerstörung des Wabenkörpers zu verhindern.A metal spring, which is adjustable, is applied to the insulating compound a pressure is applied so that the catalyst body is held in place will. However, such a holder has not proven to be elastic enough. The pressure exerted on the catalyst is too great and not uniform enough distributed in order to prevent gradual mechanical destruction of the honeycomb body.

Gemäß der in der DAS 1 476 507 beschriebenen Vorrichtung zur katalytischen Reinigung von Autoabgasen wird der monolithische Katalysatorkörper in einem zylindrischen Gehäuse zwischen zwei mit dem Gehäuse gasdicht verbundenen Ringflanschen untergebracht.According to the device described in DAS 1 476 507 for the catalytic The monolithic catalyst body in a cylindrical one is used for cleaning car exhaust gases Housing housed between two ring flanges connected to the housing in a gas-tight manner.

In dem Ringspalt zwischen Gehäuse und Katalysatorkörper befindet sich ein gewellter Maschendraht, der den Katalysatorkörper eng umgibt.In the annular gap between the housing and the catalyst body is located a corrugated wire mesh that tightly surrounds the catalyst body.

In der Praxis hat sich jedoch erwiesen, daß die gewellten Metallgeflechteinlagen, selbst bei Verwendung von hochhitzebeständigem Stahl, der hohen thermischen und mechanischen Beanspruchung nicht standhalten. Der im Metallgeflecht eingebettete Keramikkörper fängt an zu wandern, wenn die Einspannwirkung durch das Drahtgeflecht verloren geht. Durch die hohe Schwingungsbeanspruchung erfolgt dann rasch die Zerstörung des keramischen Körpers.In practice, however, it has been shown that the corrugated metal mesh inserts, even when using highly heat-resistant steel, the high thermal and cannot withstand mechanical stress. The one embedded in the metal mesh Ceramic body begins to migrate when the gripping effect is through the wire mesh get lost. The high vibration stress then quickly results in destruction of the ceramic body.

Es wurde nun eine elastische Halterung für keramische monolithische Katalysatorkörper entwickelt, die besonders hohen Beanspruchungen gewachsen ist. Sie besteht im wesentlichen aus einem Wellrohr aus warmfestem Werkstoff, vorzugsweise aus einem hitzebeständigen Stahl, das durch die ihm aufgebrachte Vorspannung auf eine Zwischenlage aus verdichtbarem keramischen Material eine Druckkraft ausübt, und dadurch einen außen konisch ausgebildeten rohrförmigen Keramikkörper, der mit dem Katalysatorkörper fest verbunden ist, an dessen Umfang elastisch einspannt.There was now an elastic mount for ceramic monolithic Developed a catalyst body that can withstand particularly high loads. It consists essentially of a corrugated pipe made of heat-resistant material, preferably made of a heat-resistant steel, which is due to the prestress applied to it an intermediate layer of compressible ceramic material a Compressive force exercises, and thereby an externally conical tubular ceramic body, which is firmly connected to the catalyst body, clamps elastically on its circumference.

Die erfindungsgemäße elastische Halterung ist im Län£sschnitt in Fig. 1 dargestellt. Sie besteht im einzelnen aus einem Wellrohr 1, das gleichzeitig als Außenmantel einer Abgas- bzw.The elastic holder according to the invention is shown in the longitudinal section in Fig. 1 shown. It consists in detail of a corrugated pipe 1, which at the same time as Outer jacket of an exhaust gas resp.

einer Auspuffleitung dient und an den Enden fest mit Flansch 4 bzw. Flansch 6 verbunden ist. Das Wellrohr ist außer mit Flansch 6 an diesem Ende weiterhin mit einem dünnen. Metallrohr 8 einseitig fest verbunden. Der eigentliche Katalysatorkörper 7 ist in einen keramischen H0r>l2ylinder 2 eingekittet oder durch einen Brennprozeß fest mit diesem verbunden. Der keramische Hohlzylinder 2 ist außen an einem Ende zunächst zylindrisch und im weiteren Teil konisch ansteigend ausgebildet und liegt an Flansch 6 an Flansch 4 hat gegenüber dem Keramikkörper 2 etwas freies Spiel. Zwischen Metallrohr 8 und dem Keramikkörper 2 befindet sich ein Ringspalt 9, der mit einem verdichtbaren Isoliermaterial 3, z. B. einer kerarmischen X atte, ausgefüllt ist. Auf dem zylindrischen Teil des Ke'nikkörpers 2 ist eine Dichtungsscheibe 5 leicht verschiebbar angebracht.serves as an exhaust line and is fixed at the ends with flange 4 resp. Flange 6 is connected. The corrugated pipe is still with the exception of flange 6 at this end with a thin. Metal pipe 8 firmly connected on one side. The actual catalyst body 7 is cemented into a ceramic cylinder 2 or by a firing process firmly connected to this. The ceramic hollow cylinder 2 is outside at one end initially cylindrical and conically ascending in the further part and is located on flange 6 on flange 4 has some free play compared to ceramic body 2. Between the metal tube 8 and the ceramic body 2 there is an annular gap 9, the with a compressible insulating material 3, e.g. B. a kerarmic X atte, filled out is. A sealing washer 5 is located on the cylindrical part of the corner body 2 attached so that it can be moved easily.

Das Wellrohr 1 erhält bei der Montage eine Vorspannung, ao daß es im fertig montierten Zustand auf den Körper 2 über das IO-liermaterial 3 als Zugfeder wirkt. Durch die leichte Verschtebbarkeit der Dichtungsscheibe 5 auf den zylindrischen Körper wird auch bei längerer Betriebsdauer, selbst wenn sich das Isoliermaterial 3 etwas gesetzt hat, dieses soweitgehend Z-sammengedrückt, daß der Ringspalt 9 vollkommen damit ausgefüllt ist. Dadurch wird der keramische Körper 2 und damit der Katalysatorkörper 7 an seinem Umfang stets fest in seiner Stellung gehalten.The corrugated pipe 1 receives a bias during assembly, ao that it in the fully assembled state on the body 2 via the IO-liermaterial 3 as a tension spring works. Due to the easy shiftability of the sealing washer 5 on the cylindrical Body will also with prolonged use, even if the insulating material 3 has set something, this as far as Z-compressed that the annular gap 9 completely is filled with it. This becomes the ceramic body 2 and thus the catalyst body 7 always held firmly in its position on its circumference.

Claims (1)

PatentanspruchClaim 1. Elastische Halterung für monolithische Katalysatorkörper, bestehend aus einem Wellrohr 1, das gleichzeitig Außenwand einer Abgasleitung und fest mit den Flanschen 4 und 6 verbunden ist, einem einseitig an diesem befestigten Metallrohr 8, einem rohrförmigen, außen konisch ausgebildeten keramischen Körper 2, der mit dem monolithischen Katalysatorkörper 7 fest verbunden ist und der an Flansch 6 fest anliegt, einer auf dem zylindrischen Teil des keramischen Körpers 2 verschiebbaren Scheibe 5 und einer verdichtbaren keramischen Packung 3, die sich in dem Ringspalt 9 zwischen Metallrohr 8 und Keramikkörper 2 befindet und die den Keramikkörper 2 infolge der dem Wellrohr 1 aufgebrachten Vorspannung am Umfang elastisch einspannt.1. Elastic holder for monolithic catalyst bodies, consisting from a corrugated pipe 1, which is at the same time the outer wall of an exhaust pipe and firmly with the flanges 4 and 6 is connected, a metal pipe attached to one side of this 8, a tubular, externally conical ceramic body 2, which with the monolithic catalyst body 7 is firmly connected and the flange 6 is firmly is applied, one on the cylindrical part of the ceramic body 2 displaceable Disc 5 and a compressible ceramic packing 3, which is located in the annular gap 9 is located between metal tube 8 and ceramic body 2 and the ceramic body 2 as a result of the bias applied to the corrugated pipe 1 elastically clamps on the circumference.
DE19722209488 1972-02-29 1972-02-29 ELASTIC SUPPORT FOR MONOLITHIC CATALYST BODY Withdrawn DE2209488A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DE19722209488 DE2209488A1 (en) 1972-02-29 1972-02-29 ELASTIC SUPPORT FOR MONOLITHIC CATALYST BODY
NL7302006A NL7302006A (en) 1972-02-29 1973-02-13
US333714A US3891396A (en) 1972-02-29 1973-02-20 Elastic holder for ceramic monolithic catalyst bodies
CA164,072A CA983279A (en) 1972-02-29 1973-02-20 Elastic holder for ceramic monolithic catalyst bodies
FR7306779A FR2174065B1 (en) 1972-02-29 1973-02-26
SE7302725A SE384066B (en) 1972-02-29 1973-02-27 ELASTIC HALLER FOR MONOLITICAL CATALYST BODIES, SPEC. FOR EXHAUST CLEANER DEVICES
IT2092473A IT979533B (en) 1972-02-29 1973-02-27 ELASTIC SUPPORT SYSTEM FOR MONOLI TIOI CERAMIC CATALYTIC BODIES
JP2418673A JPS5618770B2 (en) 1972-02-29 1973-02-28
GB908073*[A GB1415939A (en) 1972-02-29 1973-12-23 Device for cleaning exhaust gases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722209488 DE2209488A1 (en) 1972-02-29 1972-02-29 ELASTIC SUPPORT FOR MONOLITHIC CATALYST BODY

Publications (1)

Publication Number Publication Date
DE2209488A1 true DE2209488A1 (en) 1973-09-13

Family

ID=5837402

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19722209488 Withdrawn DE2209488A1 (en) 1972-02-29 1972-02-29 ELASTIC SUPPORT FOR MONOLITHIC CATALYST BODY

Country Status (1)

Country Link
DE (1) DE2209488A1 (en)

Similar Documents

Publication Publication Date Title
DE2216772A1 (en) ELASTIC MOUNT FOR CERAMIC MONOLITHIC CATALYST BODY
DE2233886A1 (en) ELASTIC MOUNT FOR CERAMIC MONOLITHIC CATALYST BODY
DE2216644A1 (en) ELASTIC MOUNT FOR CERAMIC MONOLITHIC CATALYST BODY
DE2318128C3 (en) Pressure transducer
DE2434102A1 (en) CATALYST FOR THE CATALYTIC CLEANING OF EXHAUST GASES
DE2313166C3 (en) Device for holding a catalyst monolith
DE2312794A1 (en) CATALYST FOR THE CATALYTIC CLEANING OF EXHAUST GASES
DE4007724A1 (en) SOOT FILTER FOR DIESEL ENGINES
DE2723532B2 (en) Device for detoxifying exhaust gases from internal combustion engines in motor vehicles
DE2412863A1 (en) ELASTIC MOUNTING OF A CATALYST
EP3581907A1 (en) Membrane pressure sensor with measuring spring support tube and pressure sensor coated ontop of the measuring spring support tube
DE2809325A1 (en) CATALYTIC CONVERTER FOR USE IN EXHAUST OR EXHAUST SYSTEMS OF INTERNAL COMBUSTION ENGINES
DE2209488A1 (en) ELASTIC SUPPORT FOR MONOLITHIC CATALYST BODY
DE2300704A1 (en) Catalytic exhaust gas purifier - has ceramics element with fired molybdenum coating supported by corrugated tube
EP0200709A2 (en) Pressure transducer
DE3540231C2 (en)
DE2417554A1 (en) CATALYTIC CONVERTER FOR THE TREATMENT OF EXHAUST GASES AND THE PROCESS FOR ITS MANUFACTURING
DE1902911A1 (en) Seal for a wall recess receiving a pipe or the like
DE2331434A1 (en) EXHAUST GAS PURIFICATION DEVICE
DE2627596C3 (en) Device for the catalytic cleaning of exhaust gases from internal combustion engines
DE2458994A1 (en) Exhaust purifier with ceramic catalyst carrier - has overlapping foils between carrier and ceramic fibre jacket in housing
DE2537062C2 (en) Thermal reactor for the exhaust gases from an internal combustion engine
DE2242888A1 (en) DEVICE FOR ACCOMPANYING CATALYSTS FOR EXHAUST GAS DETOXIFICATION OF COMBUSTION ENGINES
EP0422356A1 (en) Double-walled pipe
DE2248442B2 (en) Apparatus for the catalytic cleaning of exhaust gases and a process for the production of the apparatus

Legal Events

Date Code Title Description
OD Request for examination
8130 Withdrawal