A 3WCC Global Kinetic Model: A Calibration Method Using Laboratory Scale and Engine Test Bench Experiments

Millet, Claire-Noelle; Benramdhane, Sheϊma

doi:10.4271/2008-01-0453

Cited by 8 publications

(10 citation statements)

References 13 publications

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“…The estimated kinetic parameters appeared to be in agreement to those presented in the literature. For instance, the activation energy of CO was estimated at 93 kJ/mol for the so-called monofunctional path (reaction on the precious metals only), while it is presented in the literature in a range from 88 to 122 kJ/mol 1,9,38 for TWC. This activation energy is generally close to the binding energy of absorbed CO. 39 This is because the catalyst surface is almost completely covered by CO under reaction conditions, and hence, the reaction rate is controlled by the rate of CO desorption.…”

Section: Resultsmentioning

confidence: 99%

Global Kinetic Model of a Three-Way-Catalyst-Coated Gasoline Particulate Filter: Catalytic Effects of Soot Accumulation

Goes

Olsson

Watling

2021

Ind. Eng. Chem. Res.

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In the present study, a global kinetic model of three-way-catalyst-coated gasoline particulate filters was developed to understand the relevant kinetic mechanisms taking place both in clean and real soot-loaded filters. The model involves reaction rate expressions for CO, C 2 H 4 , and C 7 H 8 conversion over a model Pd/CeZr/Al 2 O 3 catalyst, hydrothermally treated at 650 °C.Particularly, a new rate expression was proposed for ethylene based on the distinctive experimental trends observed for this hydrocarbon. The model predicted satisfactorily the conversion of all three reductants under different experimental conditions. The soot inhibition effect was also modeled by the reduction of the number of active sites. Interestingly, ethylene was less affected compared to other reductants by the presence of soot due to the formation of less stable and more reactive species on the catalyst surface.

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Section: Resultsmentioning

confidence: 99%

Global Kinetic Model of a Three-Way-Catalyst-Coated Gasoline Particulate Filter: Catalytic Effects of Soot Accumulation

Goes

Olsson

Watling

2021

Ind. Eng. Chem. Res.

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“…This shows that the NOx conversion model during lean operating conditions should be improved. The principle of this reaction model is explained in [16]. Future work will consist of improving this model for lean conditions.…”

Section: Faer Variation @ Gshv = 70 000 H -1mentioning

confidence: 99%

“…The reactions taken into account in the 3WC model are those presented in [16]. The hydrocarbon was written as C x H y .…”

Section: Reaction Schemementioning

confidence: 99%

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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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“…Extensive experimental activity involving the usage of synthetic gas benches and small-scale samples of the monolith are necessary to generate those sets of data needed for the calibration of the reaction kinetics model [92,93]. Further, the obtained calibration parameters may need adjustments when applied to real-world diesel exhaust [94]. This fact generated motivation in the research community to investigate on the reasons for this discrepancy; it is common agreement that one of the cause for the disparity between synthetic gas bench and real-world exhaust data can be attributed to the speciation of hydrocarbons [95].…”

Section: Diesel Oxidation Catalystmentioning

confidence: 99%

Advanced DOC-DPF Model to Predict Soot Accumulation and Pressure Drop in Diesel Particulate Filters

Cozzolini¹

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Diesel Particulate Filters (DPFs) are regarded as the most effective technology to reduce particulate matter (PM) emissions from modern diesel engines. PM mass collected inside the filter needs to be periodically oxidized to clean the porous walls in order to avoid excessive backpressure that could negatively affect engine and turbocharger performances leading to higher fuel consumption. Diesel Oxidation Catalysts (DOCs), on the other hand, represent an effective means to reduce hydrocarbon (HC) emissions and set the proper chemical conditions at the inlet of the DPF to enhance soot oxidation during filter regeneration. Due to the impact that these devices have on tailpipe emissions, monitoring functions aimed at assessing the health of these systems need to be implemented in the engine on-board diagnostics (OBD) system. Further, in-depth understanding of filtration and regeneration mechanisms, together with the ability of predicting actual DPF loading conditions, could play a key role in optimizing regeneration strategies adopted to keep the particulate filter within safe operating conditions. Hence, the use of real-time, yet accurate models is of primary importance to face with advanced control challenges, such as the integration of DOCs and DPFs with the engine or other critical aftertreatment components, or to properly develop model-based OBD monitors. This study aims at addressing the challenges related with real-time modeling of both DOCs and DPFs with special regard to the calibration of key parameters. At first, the development of a 1-D model for the diesel oxidation catalyst is presented;: two different approaches representing two different trade-offs in terms of model complexity/speed are discussed and analyzed. A 1-D model of a DPF is then presented, addressing the coupling of filtration and regeneration over cake, washcoat and wall thicknesses. Moreover, the approach followed to develop the DPF model is innovative as it is directly integrated via analytical functions, thus improving the discretized approach used in similar models. Finally, an innovative model tuning methodology called Virtual Conditioning is presented and applied to generate robust model calibrations. Numerical results are compared with experimental data gathered at West Virginia University's (WVU) Engine and Emissions Research Laboratory (EERL) using a Mack heavy-duty diesel engine coupled to a Johnson Matthey C-CRT aftertreatment system. The study shows that: a) DOC model is capable of replicating measured outlet emissions concentrations with an accuracy of 15% and minimal computational requirements over both steady-state and transient operating conditions; b) DPF wall and washcoat layer present different regeneration and collection dynamics, whose behavior is important to capture filter pressure drop and temporal evolution of the collected mass; c) advanced filtration and regeneration process treatment in the wall together with a robust calibration process allow for the use of constant model parameters to replicate combinations of ...

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A 3WCC Global Kinetic Model: A Calibration Method Using Laboratory Scale and Engine Test Bench Experiments

Cited by 8 publications

References 13 publications

Global Kinetic Model of a Three-Way-Catalyst-Coated Gasoline Particulate Filter: Catalytic Effects of Soot Accumulation

Global Kinetic Model of a Three-Way-Catalyst-Coated Gasoline Particulate Filter: Catalytic Effects of Soot Accumulation

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

Advanced DOC-DPF Model to Predict Soot Accumulation and Pressure Drop in Diesel Particulate Filters

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