Pre-Turbocharger Catalyst - Fast catalyst light-off evaluation

Carberry, B.; Grasi, Georg; Guérin, S.; Jayat, François; Konieczny, Roman

doi:10.4271/2005-01-2142

Cited by 14 publications

(6 citation statements)

References 2 publications

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“…One proposed solution [1][2][3] to this problem is to place a small catalyst before the turbocharger, where the exhaust temperature is generally about 100°C higher than in the post-turbo position. Owing to space and back pressure considerations, these pre-turbo catalysts must be very small and operate at very short residence times.…”

Section: Introductionmentioning

confidence: 99%

Heat and mass transfer limitations in pre-turbocharger catalysts

Mmbaga

Hayes

et al. 2007

Top Catal

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The use of the Diesel engine is increasing, while at the same time emission limits are becoming more stringent. To reduce emissions, novel catalyst converter designs have been proposed, including the placement of a small converter before the turbocharger. The role of this catalyst is to provide some reduction of the pollutant level prior to the main catalyst. This catalyst is typified by high flow rates. In this paper the performance of small catalytic converters operated at high flowrate is examined using computer simulation. The oxidation of CO is used as a model reaction. It is shown that for a typical oxidation catalyst, conversions of the order of 30% can be achieved at typical temperatures and a GHSV of 5 million h )1 .

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Section: Introductionmentioning

confidence: 99%

Heat and mass transfer limitations in pre-turbocharger catalysts

Mmbaga

Hayes

et al. 2007

Top Catal

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“…One possible reason to explain these very high efficiencies with small catalyst volumes was that the turbulent flow into the PTC channel leads to a better mass transfer of the pollutants from the gas stream to the active coated walls. This turbulence phenomenon was verified later on by calculation of the mass transfer coefficient ß as a function of the gas speed or catalyst diameter [7]. The influence of the PTC on the main DOC is also presented in [7], with the PTC reducing the pollutant concentrations in the exhaust gas and producing a resultant exotherm, the main DOC gets an earlier light-off and a better overall performance than without a PTC.…”

Section: Ptc Conceptmentioning

confidence: 83%

“…The PTC oxidation functionality has been further proven on Euro III and Euro IV Diesel passenger cars [6,7]. It has been shown that the addition of a PTC (with volume up to 40 ml) in the exhaust line could permit the elimination of the under-floor catalyst of a serial solution made up of a CCC and a UFC (thus reducing by 70% the total volume of the DOC function in this case), or to replace the main Euro IV DOC of an Euro IV vehicle by its prior Euro III part (thus decreasing the PGM loading by 50g/ft³).…”

Section: Experience In the Fieldmentioning

confidence: 99%

Pre-Turbocharger-Catalyst - Catalytic Performances on an Euro V Type Diesel Engine and Robust Design Development

Konieczny

Müller

Cherington

et al. 2008

SAE Technical Paper Series

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“…Another idea is the relocation of the catalytic converter upstream from the turbine. The exhaust gas temperature is at least 50°C higher than that measured downstream from the turbine, which would contribute to a faster achievement of the effective operation of the catalytic converter [8]. In addition, an increase in the temperature of the exhaust gas in the catalytic converter resulting from the exothermic nature of the reactions occurring inside could improve the operating conditions of the turbine, which operates in a five-stroke engine at a relatively low temperature.…”

Section: Discussionmentioning

confidence: 99%

A three-way catalyst system for a five-stroke engine

Noga¹

2019

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This paper presents the results of research on the development of an exhaust gas aftertreatment system for a turbocharged five-stroke engine. This engine was designed and constructed at Cracow University of Technology. A characteristic feature of the five-stroke engine is the use of an additional expansion process to increase overall efficiency. A challenge for a catalytic converter is the fact that it has a low exhaust gas temperature. Two three-way catalytic converters were tested-one with a ceramic support and the second with a metal support. The results of the tests showed that the reactor with a ceramic support obtains an acceptable conversion efficiency starting with an exhaust gas temperature of 280°C. For the metal-support reactor, a few percent increase in torque and a decrease in the brake-specific fuel consumption of the engine was obtained; however, the converter itself did not show signs of operation even with an exhaust gas temperature of over 380°C. The performed analyses highlighted directions of further development works in this area.

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Pre-Turbocharger Catalyst - Fast catalyst light-off evaluation

Cited by 14 publications

References 2 publications

Heat and mass transfer limitations in pre-turbocharger catalysts

Heat and mass transfer limitations in pre-turbocharger catalysts

Pre-Turbocharger-Catalyst - Catalytic Performances on an Euro V Type Diesel Engine and Robust Design Development

A three-way catalyst system for a five-stroke engine

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