Structured Foil Catalysts: A Road Map to Highly Effective, Compact Systems Aftertreatment

Downey, Markus; Müller-Haas, Klaus; Park, Talus; Diewald, Robert; Radovanovic, Rod

doi:10.4271/2007-01-4038

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…These Hawthorn correlations apply to average transfer coefficients in circular channels but have been adapted to local heat transfer coefficients and alternative geometries including triangular and sinusoidal channels typical of FeCrAl honeycombs . Correlations mainly refer to laminar-flow conditions that cover most of the practical applications; however, advanced configurations have been developed for FeCrAl honeycombs that enhance heat and mass transfer coefficients by repeated disruption of the laminar-flow structure …”

Section: Heat and Mass Transfer In Fecral Structuresmentioning

confidence: 99%

FeCrAl as a Catalyst Support

et al. 2020

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The iron-chromium-aluminum alloy (FeCrAl) is an exceptional support for highly exothermic and endothermic reactions that operate above 700 °C in chemically aggressive environments, where low heat and mass transfer rates limit reaction yield. FeCrAl two-and three-dimensional structured networksmonoliths, foams, and fibersmaximize mass transfer rates, while their remarkable thermal conductivity minimizes hot spots and thermal gradients. Another advantage of the open FeCrAl structure is the low pressure drop due to the high void fraction and regularity of the internal path. The surface Al 2 O 3 layer, formed after an initial thermal oxidation, supports a wide range of metal and metal oxide active phases. The aluminum oxide that adheres to the metal surface protects it from corrosive atmospheres and carbon (carburization), thus allowing FeCrAl to operate at a higher temperature. The top applications are industrial burners, in which compact knitted metal fibers distribute heat over large surface areas, and automotive tail gas converters. Future applications include producing H 2 and syngas from remote natural gas in modular units. This Review summarizes the specific preparation techniques, details process operating conditions and catalyst performance of several classes of reactions, and highlights positive and challenging aspects of FeCrAl.

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Section: Heat and Mass Transfer In Fecral Structuresmentioning

confidence: 99%

FeCrAl as a Catalyst Support

et al. 2020

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“…Oxidation catalysts with structured foil are particularly efficient at minimising HC slip since they are able to equalise any uneven fuel distribution and improve volume specific conversion. Previous studies have demonstrated the benefits in oxidation performance of such "turbulent" DOC's in several examples [1,2,3]. Figure 3 illustrates the advantage that LS structured foil provides for both HC conversion (at test conditions 1000ppm HC and T=475C) and NO 2 production (at test conditions T=350 C).…”

Section: Optimization Of Nox and Pm Aftertreatment System Components mentioning

confidence: 90%

Development of an Integrated NOx and PM Reduction Aftertreatment System: SCRi™ for Advanced Diesel Engines

Rice¹,

Krämer²,

Mueller

et al. 2008

SAE Technical Paper Series

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The appearance of this ISSN code at the bottom of this page indicates SAE´s consent that copies of the paper may be made for personal or internal use of specific clients. This consent is given on the condition, however, that the copier pay $ 7.00 per article copy fee through the Copyright Clearance Center, Inc. Operations Center, 222 Rosewood Drive, Danvers, MA 01923 for copying beyond that permitted by Sections 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Customer Sales and Satisfaction Department. Quantity reprint rates can be optained from the Customer Sales and Satisfaction Department. To request permission to reprint a technical paper or permission to use cpyrighted SAE publications in other works, contact the SAE Publication Group. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher.

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“…In the DOC application, the longitudinal (LS) structure can be used to reduce the size of the DOC substrate. The blades that are rolled into the corrugated layer enhance the mass transfer within the catalytic converter channel, increasing the efficiency of the entire catalytic converter [6]. Based on this increased efficiency, the catalytic converter in a DOC application can be reduced in volume by up to 30% for a given emissions reduction performance.…”

Section: Aftertreatment System Makeupmentioning

confidence: 99%

Pre-Turbo Aftertreatment Position for Large Bore Diesel Engines - Compact & amp; Cost-Effective Aftertreatment with a Fuel Consumption Advantage

Subramaniam¹,

Hayes²,

Tomazic³

et al. 2011

SAE Int. J. Engines

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Tier 4 emissions legislation is emerging as a clear precursor for widespread adoption of exhaust aftertreatment in offhighway applications. Large bore engine manufacturers are faced with the significant challenge of packaging a multitude of catalyst technologies in essentially the same design envelope as their pre-Tier 4 manifestations, while contending with the fuel consumption consequences of the increased back pressure, as well as the incremental cost and weight associated with the aftertreatment equipment. This paper discusses the use of robust metallic catalysts upstream of the exhaust gas turbine, as an effective means to reduce catalyst volume and hence the weight and cost of the entire aftertreatment package. The primarily steady-state operation of many large bore engine applications reduces the complication of overcoming pre-turbine catalyst thermal inertia under transient operation. Upstream placement of the catalyst packages also offers potential for reducing the overall fuel consumption penalty (associated with the use of aftertreatment) in comparison to the conventional post-turbine placement. This softening of the fuel consumption penalty can be attributed to better light-off and performance of catalyst substrates, as well as a reduction in the impact of aftertreatment pressure drop on engine pumping work. The investigation involved numerical simulation of pre-turbo application of a diesel oxidation catalyst (DOC), partial-flow diesel particulate filter (DPF), and selective catalytic reduction (SCR) catalyst on a 30-35L class diesel engine. The effect of this placement over traditional downstream placement in terms of fuel consumption, package size, weight and cost was examined. The investigation revealed that the inherently higher gas density in the pre-turbine location allows a dramatic reduction in catalyst volume of up to 70%. The fuel consumption penalty associated with the addition of aftertreatment can also be reduced by approximately 1% with upstream placement of the catalyst packages.

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Structured Foil Catalysts: A Road Map to Highly Effective, Compact Systems Aftertreatment

Cited by 7 publications

References 2 publications

FeCrAl as a Catalyst Support

FeCrAl as a Catalyst Support

Development of an Integrated NOx and PM Reduction Aftertreatment System: SCRi™ for Advanced Diesel Engines

Pre-Turbo Aftertreatment Position for Large Bore Diesel Engines - Compact & amp; Cost-Effective Aftertreatment with a Fuel Consumption Advantage

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