Improved Cell Design for Increased Catalytic Conversion Efficiency

Held, Wolfgang; Rohlfs, Manfred; Maus, Wolfgang; Swars, Helmut; Brück, Rolf; Kaiser, Friedrich W.

doi:10.4271/940932

Cited by 27 publications

(10 citation statements)

References 2 publications

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“…By preprocessing the foil material different types of channel structures are possible which directly influence the channel flow. The potential available substrate designs were earlier discussed and presented in [3,4] TRANSVERSAL STRUCTURE TS The Transversal Structure (TS) is shown schematically in Figure 5. The structure is applied to the sinusoidal corrugated foil as a secondary corrugation 90 degree to the flow direction.…”

Section: The Traditional Catalyst Constructionmentioning

confidence: 99%

“…Figure 6 shows the calculated mass transfer coefficient as a function of channel length. The benefits of the improved heat transfer and mass transfer coefficient through the TS structure were demonstrated in vehicle test programs and successful used in series production due to the advantageous backpressure by avoiding higher cell density [ 4], [ 5].…”

Section: The Traditional Catalyst Constructionmentioning

confidence: 99%

“…Figure 11 shows a cut of a PE Metalit ® showing the mixing chambers. Catalysts with areas of higher space velocity may result in regions of the catalyst yielding different rates of conversion and rates of aging [4]. Taking the same manifold and replacing the standard substrate by a PE Metalit ® results in a more homogeneous flow pattern.…”

Section: Cylinder 1 Cylinder 2 Cylinder 3 Cylinder4mentioning

confidence: 99%

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Innovative Metallic Substrates for Exhaust Emission Challenges for Gasoline and Diesel Engines

Müller-Haas¹,

Rice²

2005

SAE Technical Paper Series

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Increasingly stricter emission standards for gasoline and diesel engines accelerated the exhaust aftertreatment industry to develop high efficiency catalysts with innovative substrates. Engineers face thermodynamic and thermal management challenges to achieve system emission, noise and back pressure targets at minimum costs. This paper describes advanced substrate technology for exhaust after treatment systems for gasoline and diesel engines. The first part focuses on substrate technology solutions including high cell density substrates and advanced metallic substrates with structured and perforated foil material. This new substrate technology offers great potential to optimize the overall system efficiency through exhaust mixing within the catalyst at minimum back pressure. Transient temperature condition and available packaging space will have remarkable impact on system design and catalyst performance for future advanced combustion engines and hybrid vehicles.

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Section: The Traditional Catalyst Constructionmentioning

confidence: 99%

Section: The Traditional Catalyst Constructionmentioning

confidence: 99%

Section: Cylinder 1 Cylinder 2 Cylinder 3 Cylinder4mentioning

confidence: 99%

See 1 more Smart Citation

Innovative Metallic Substrates for Exhaust Emission Challenges for Gasoline and Diesel Engines

Müller-Haas¹,

Rice²

2005

SAE Technical Paper Series

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“…23 Finally, Figure 1c shows the Behr MS design, in which the channels are cut and displaced to generate repeated inlet disturbances of the flow. 22 The present work consists of a first investigation of a new type of corrugated metal monolith, the EcoCat, 24 which contains bumps to improve the mass-transfer properties in the channels. The mass transfer and pressure drop of this new type of monolith are investigated experimentally.…”

Section: Introductionmentioning

confidence: 99%

“…They too observed a higher mass-transfer rate for the channels with obstacles compared to those with a straight channel, mainly because the flow was directed toward the walls. The idea of disturbing the flow by wall inclinations has been commercialized in the Emitec TS, which is a metal monolith with triangular channels with small, rounded corrugations; see Figure b. These corrugations have been found to improve the mass-transfer rate by about 15%, but at the same time the pressure drop was increased by 14−18% .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Mass Transfer in Monolith Catalysts with Bumps on the Channel Walls

Holmgren

1999

Ind. Eng. Chem. Res.

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The mass-transfer rate in metallic triangular monolith channels with small protuberances on the channel walls was measured and compared with conventional, straight channels without bumps. The CO oxidation reaction was used to estimate the mass-transfer rates. Measurements were made at Reynolds numbers between 300 and 1400. The channels were 3.7 mm wide and 2.6 mm high and had a length of 96.5-152 mm. Two different bump heights were investigated: 1 and 1.2 mm. Moreover, the distance between the bumps as well as the distance from the inlet to the first bump was varied. It was found that the protuberances increase the mass-transfer rate, expressed as the Sherwood number. The increase was higher when the Reynolds number was increased. There was also a penalty of increased pressure drop. However, when the j D factor for mass transfer was compared with the friction factor f, it was found that the increase in mass transfer was generally higher than the increase in pressure drop.

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Automotive Substrates

2009

Catalytic Air Pollution Control

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Improved Cell Design for Increased Catalytic Conversion Efficiency

Cited by 27 publications

References 2 publications

Innovative Metallic Substrates for Exhaust Emission Challenges for Gasoline and Diesel Engines

Innovative Metallic Substrates for Exhaust Emission Challenges for Gasoline and Diesel Engines

Enhanced Mass Transfer in Monolith Catalysts with Bumps on the Channel Walls

Automotive Substrates

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