Current status of modeling lean exhaust gas aftertreatment catalysts

Güthenke, A.; Chatterjee, Daniel; Weibel, Michel; Krutzsch, B.; Kočí, Petr; Marek, M.; Nova, Isabella; Tronconi, Enrico

doi:10.1016/s0065-2377(07)33003-2

Cited by 95 publications

(61 citation statements)

References 116 publications

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“…The ammonia then reacts selectively with NO x under lean (oxidizing) conditions, giving N 2 as the final product. 1 Mainly V 2 O 5 /WO 3 /TiO 2 or zeolite formulations (Fe-ZSM5 and Cu-ZSM5) are currently used in automobile applications. 2 The NSRC converter must be operated with periodic regenerations, i.e., temporarily increased concentration of the reducing components normally present in the exhaust gas (CO, H 2 and HC).…”

Section: 2mentioning

confidence: 99%

“…1,2,3 Besides nitrogen, the desired main product of the NO x reduction, also significant amount of NH 3 can be formed in the NSRC depending on the regeneration phase length, temperature and gas composition. 3 In a stand-alone NSRC, the regenerations need to be properly calibrated with respect to actual catalyst conditions to avoid excessive NH 3 formation.…”

Section: 2mentioning

confidence: 99%

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Dynamics of a Combined DOC−NSRC−SCR Exhaust Gas Aftertreatment System with Periodic Regenerations

Plát

Bártová

Štěpánek

et al. 2010

Ind. Eng. Chem. Res.

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SummaryA combined exhaust gas after-treatment system is studied, consisting of a Diesel oxidation catalyst (DOC), an NO x storage and reduction catalyst (NSRC, also called lean NO x trap, LNT), and a catalyst for selective catalytic reduction of NO x by NH 3 (NH 3 -SCR). The catalyst samples are located in series in a nearly isothermal lab mini-reactor. Dynamic behavior of the system is examined in periodic lean/rich operation at different temperatures. Gas components concentrations are measured at the inlet, outlet, and in between the individual catalysts. Conversions, selectivities and reaction mechanisms in each converter are discussed.

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Section: 2mentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

Dynamics of a Combined DOC−NSRC−SCR Exhaust Gas Aftertreatment System with Periodic Regenerations

Plát

Bártová

Štěpánek

et al. 2010

Ind. Eng. Chem. Res.

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“…A model of the monolith is described below to illustrate a classical 1D approach. It is extracted from a software environment called ExACT used at Daimler AG [11]. The bulk gas temperature and the bulk gas species equations are written as follows:…”

Section: One-dimensional Modelsmentioning

confidence: 99%

0D Modelling: a Promising Means for After-treatment Issues in Modern Automotive Applications

Mauviot

Berr

Raux

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Combust. 31,. Cette approche peut être utilisée comme un moyen de compréhension de phénomènes complexes qui régissent le catalyseur impliquant plusieurs domaines de la physique. Elle représente aussi un outil de simulation pertinent dans la définition des architectures de ligne de post-traitement et dans le contrôle des émissions polluantes. Le potentiel de l'approche pour traiter l'ensemble des organes de post-traitement est illustré par des résultats sur un catalyseur trois voies (3WC), un catalyseur d'oxydation Diesel (DOC), un piège à NOx (LNT), un système de catalyse sélective des NOx (SCR) et un filtre à particules (DPF). Cette capacité à fournir avec un bon compromis temps/précision des informations intéressantes pour aider au développement de systèmes de post-traitement de plus en plus complexes rend la simulation 0D particulièrement attractive. Oil & Gas Science and Technology -Rev. IFP, Vol. 64 (2009) and Technology -Rev. IFP, Vol. 64 (2009) , No. 3, pp. 285-307 Copyright © 2009, Institut français du pétrole DOI: 10.2516/ogst/2009023 Simulation Tools for Powertrain Design and Control Outils de simulation pour la conception et le contrôle du groupe motopropulseur D o s s i e r Oil & Gas Science

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“…To date, most simulation work on exhaust treatment systems is based on the Langmuir-Hinshelwood-Hougen-Watson (LHHW) approach, i.e., it is assumed that the rates of the surface reactions are controlled by competition for surface sites and that steady state surface concentrations are instantly established for given gas phase conditions [1]. One important consequence arising from these assumptions is that global rate laws can be formulated, which describe the observed rates r as a function of only the current gas phase concentrations and the surface temperature r (c gas , T), and not the history of operating conditions.…”

Section: Introductionmentioning

confidence: 99%

HC-Induced Deactivation in CO Conversion at Diesel Oxidation Catalysts

Herrmann

Malmberg

Drochner

et al. 2016

Emiss. Control Sci. Technol.

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This paper examines the activity of a platinum catalyst for the oxidation of CO under conditions of temperature cycling. Each cycle consists of an ignition and extinction curve obtained with a linear temperature ramp. It is shown that the catalyst activity is higher for the first ignition cycle than for the subsequent ones regarding CO conversion. The activity for the extinction portion of each cycle is the same for all cycles. It is proposed that the loss of catalyst activity results from the deposition of hydrocarbon residues during the extinction part of the cycle. The catalyst activity can be completely restored by heating the catalyst to 350°C in the presence of oxygen and nitrogen.

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Current status of modeling lean exhaust gas aftertreatment catalysts

Cited by 95 publications

References 116 publications

Dynamics of a Combined DOC−NSRC−SCR Exhaust Gas Aftertreatment System with Periodic Regenerations

Dynamics of a Combined DOC−NSRC−SCR Exhaust Gas Aftertreatment System with Periodic Regenerations

0D Modelling: a Promising Means for After-treatment Issues in Modern Automotive Applications

HC-Induced Deactivation in CO Conversion at Diesel Oxidation Catalysts

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