Metallic Substrates and Hot Tubes for Catalytic Converters in Passenger Cars, Two- and Three-Wheelers

Reck, Alfred; Bergmann, Andrée; Kaiser, Friedrich W.; Dias, C. F.

doi:10.4271/962474

Cited by 7 publications

(2 citation statements)

References 2 publications

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“…Pulsate flow and vibrations produce the deformation of the center of the cylindrical rolled monoliths that are pushed out during use (telescoping) [191]. This phenomenon can be prevented by forcing pins through the layers perpendicular to the channels, or using various forms of welding [192] and brazing between layers or across one or both end faces [193]. An interesting alternative to the classical brazing methods is proposed by EMITEC [194], which propounds the use of sandwich metal foils having the external layer of aluminum and the internal one of Fe-Cr alloy.…”

Section: Monolith Design and Manufacturing Aspectsmentioning

confidence: 99%

Monolithic reactors for environmental applications

Ávila

Montes

Miró

2005

Chemical Engineering Journal

486

278

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Section: Monolith Design and Manufacturing Aspectsmentioning

confidence: 99%

Monolithic reactors for environmental applications

Ávila

Montes

Miró

2005

Chemical Engineering Journal

486

278

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“…Additionally the product is proven to have a high reliability in the market and there is less R&D capacity needed for installing an after treatment system than for engineering a new product. Aftertreatment systems with catalysts are used worldwide in high numbers in two-and threewheelers equipped with two-stroke engines [5,6].…”

Section: Drivers For Aftertreatment Systemsmentioning

confidence: 99%

Development of an Emission Aftertreatment System for Hand Held Powertools

Lochmann

Schlessmann

Schlossarczyk

et al. 2004

SAE Technical Paper Series

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This paper gives an overview of the development work for an aftertreatment system, used in hand held powertools to fulfil the corporate average US Limits. The paper will start with a description of the annual reductions in US Limits with differences in CARB and EPA legislation and the consequences of the legislation in Europe from 2007 onwards. There then follows a chapter describing space restrictions in the given muffler leading to a maximum size for the substrate. Tests results are shown, giving an idea of additional measures taken to avoid dangerous temperatures on the muffler surface and of the emitted exhaust gas. The exothermic temperature increase created under service conditions imposes an additional thermal load from the catalyst back towards the engine itself. Therefore, some modifications regarding gas flow and positioning of the catalyst had to be made to find an adequate solution for series production. Durability tests were conducted, to ensure the proper durability behavior both in emissions and mechanical performance. The temperatures inside the catalyst are also discussed; these are extremely high under the harsh conditions very close to the outlet port of the twostroke engine. Different designs of Metalit ® are investigated with respect to vibration behavior and natural frequencies in order to find a durable and costeffective solution for series production. A shortlist of powertools that are currently in series production with the catalyst system will be given at the end of the paper.

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