Backpressure Characteristics of Modern Three-way Catalysts, Benefit on Engine Performance

Lahousse, C.; Favre, Cécile; Kern, B.; Hadrane, H.; Faillon, L.; Brown, Kyle W.; Blosser, Patrick W.; Nunan, John

doi:10.4271/2006-01-1062

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…The foil thickness of metallic substrate can be a low as 30 lm and for ceramic substrate 2.5 mil. The catalyst coating also plays a major part in optimising the backpressure of the exhaust system as reduction in the hydraulic diameter of the channels in a TWC will increase the backpressure [24] and, lower backpressure coatings have been developed that have excellent catalytic Specific heat/electron microscopy/X-ray performance [25]. In spite of its importance little has been published on this topic.…”

Section: Backpressure Considerationsmentioning

confidence: 99%

Three-way catalyst emissions control technologies for spark-ignition engines—recent trends and future developments

Collins

Twigg

2007

Top Catal

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Exhaust gas emissions from passenger cars with traditional gasoline engines have been markedly reduced over the three decades since the introduction of catalysts. The first oxidation catalysts were superseded by two-catalyst three-way systems that were followed by single three-way catalysts (TWCs). The first Pt/Rh-based TWCs formulations were refined by incorporating increasingly thermally stable ceria-based components to keep the surface composition close to stochiometric during exhaust gas composition fluctuations. Substituting Pd for Pt gave further improvement in some applications, as can zoning catalyst type or loading on a single substrate. Optimisation of cell density, geometric area, and thermal capacity of the substrate provided additional benefits. Modern advanced TWCs are very thermally stable so they can be mounted directly on the exhaust manifold. Here, with a rapid engine start-up strategy catalyst operating temperatures are quickly achieved after the engine is started. As a result extremely low emissions can be achieved, and computer models are used to predict the performance of different catalyst loadings and layouts. This is a powerful tool in the design of TWC systems for new engines/vehicles to predict what will be optimal, and today high performance from relatively very low PGM loadings is possible, in spite of increasingly stringent tailpipe emissions limits and distances over which they must be maintained. Now the performance of TWCs is monitored during actual on road driving, and this is done via measurement of the catalyst oxygen storage capacity.

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Section: Backpressure Considerationsmentioning

confidence: 99%

Three-way catalyst emissions control technologies for spark-ignition engines—recent trends and future developments

Collins

Twigg

2007

Top Catal

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“…Catalyst backpressure management on modern gasoline engines has been extensively studied throughout the industry from the effect of washcoat parameters [1] to specifics substrate effects on acceleration performance [2] and the impact of designing lower backpressure products to optimize OEM systems [3]. Beyond catalyst design, exhaust system design has also been investigated from manifolds [4] to mufflers [5] and exhaust piping considerations [6].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Three-way Catalyst Selection on Component Pressure Drop and System Performance

Pesansky

Majiros

Sorensen

et al. 2009

SAE Technical Paper Series

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The Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE's peer review process under the supervision of the session organizer. This process requires a minimum of three (3) reviews by industry experts. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.

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Emission analysis of catalytic converter with coating of nanomaterials

Ingle

Joshi

Raj

et al. 2023

Materials Today: Proceedings

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Backpressure Characteristics of Modern Three-way Catalysts, Benefit on Engine Performance

Cited by 6 publications

References 3 publications

Three-way catalyst emissions control technologies for spark-ignition engines—recent trends and future developments

Three-way catalyst emissions control technologies for spark-ignition engines—recent trends and future developments

The Effect of Three-way Catalyst Selection on Component Pressure Drop and System Performance

Emission analysis of catalytic converter with coating of nanomaterials

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