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(searched for: doi:10.4271/2011-01-1140)
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Shreyans Sethia, David Kubinski, Hans Nerlich, Jeff Naber
Journal of The Electrochemical Society, Volume 167; https://doi.org/10.1149/1945-7111/abc83e

Abstract:
Modern diesels employ a particulate filter (DPF) to reduce soot emissions. Additionally, the selective catalytic reduction (SCR) of NOx by NH3 stored on the SCR catalyst reduces NOx emissions. In some vehicles the functions of these aftertreatment components are combined in the SDPF, a DPF having a SCR washcoat. The RF resonant method has been shown to be an alternative tool for measuring the DPF's soot loading and the SCR's NH3 loading. For both applications, the transmitted electromagnetic signal between antennae placed on either side of the catalyst change with loading. Here we report the influence of the RF signal on both soot and NH3 loadings on a SDPF segment. We show that the attenuation of the RF signal by soot is much larger than that caused by saturating it with 400 ppm NH3. By taking the mean RF signal amplitude measured over a wide range of frequencies, we demonstrate a method for determination of the soot loading even in the presence of stored NH3. For "light" soot loadings, before the RF attenuation by soot cause the resonant modes to disappear in the spectra, we demonstrate a method for the simultaneous determination of both the soot and NH3 loadings.
, Thomas Steffen, Phillip Bush
Emission Control Science and Technology, Volume 6, pp 58-74; https://doi.org/10.1007/s40825-019-00150-1

Abstract:
Catalysed diesel particulate filters (c-DPF) have been described as multifunctional reactor systems. Integration of selective catalytic reduction (SCR) functionality in the DPF enhances filter performance to achieve nitrous oxides (NOx) treatment along with particulate matter (PM) collection. The physical and chemical aspects of the integrated SCR-filter make modelling difficult. The goal of this work is to develop a low-complexity model of the SCR-filter system with good fidelity. The first part of our work—presented in this paper—lays out the structure of the SCR-filter model and highlights a new approach to implement faster than real-time solution to the “full-order” or “high-complexity” model. The validated model was applied to evaluate the impact of diffusion on deNOx functionality of the SCR-filter system in a simulated characterisation exercise for the SCR-filter unit. We found that internal (pore) diffusion (effective diffusivity coefficient) and external channel to wall diffusion (mass transfer coefficient) orthogonal to the channel direction are significant for accurate characterisation of the deNOx performance of the SCR-coated filter system. System modelling can be used to select the geometric properties of the monolith (length and density of the SCR-coated filter system) and micro-properties of the washcoat (catalyst loading and zoning) to optimise the influence of diffusion on the system performance. The main contribution of this paper is the presentation of a different approach to implementing the solution to the cDPF model and in enough detail so that it can be easily replicated.
Robert Greiner, , Oleg Iliev, Barry A.A.L. van Setten,
Published: 8 June 2019
Chemical Engineering Journal, Volume 378; https://doi.org/10.1016/j.cej.2019.121919

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Venkata R. Chundru, Boopathi S. Mahadevan, John H. Johnson, , Mahdi Shahbakhti
Emission Control Science and Technology, Volume 5, pp 133-171; https://doi.org/10.1007/s40825-019-00115-4

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Lidija V. Trandafilović, Oana Mihai, Jungwon Woo, , Marie Stenfeldt,
Published: 30 August 2018
Applied Catalysis B: Environmental, Volume 241, pp 66-80; https://doi.org/10.1016/j.apcatb.2018.08.076

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, Andrew Chiffey, Joel Stetina, Kevin McGonigle, Griffin Repley, Andrew Lee, Sougato Chatterjee
Emission Control Science and Technology, Volume 3, pp 93-104; https://doi.org/10.1007/s40825-016-0059-6

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E. Tronconi, , F. Marchitti, , Dimitrios Karamitros, B. Maletic, , D. Chatterjee, M. Hehle
Emission Control Science and Technology, Volume 1, pp 134-151; https://doi.org/10.1007/s40825-015-0014-y

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Hiroyuki Kojima, Michael Fischer, Hisao Haga, Naoki Ohya, Kensuke Nishi, Takuya Mito, Naoko Fukushi
Published: 14 April 2015
SAE Technical Paper Series, Volume 1; https://doi.org/10.4271/2015-01-0994

Timothy V. Johnson
Encyclopedia of Automotive Engineering pp 1-17; https://doi.org/10.1002/9781118354179.auto138

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George G. Muntean, Mark L. Stewart, Maruthi N. Devarakonda
Encyclopedia of Automotive Engineering pp 1-18; https://doi.org/10.1002/9781118354179.auto131

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Thomas Wolff, Ramona Deinlein, Henrik Christensen, Lars Larsen
SAE International Journal of Materials and Manufacturing, Volume 7, pp 671-681; https://doi.org/10.4271/2014-01-1484

, Winthrop F. Watts, Robert A. Newman, Robin R. Ziebarth, David B. Kittelson
Environmental Science & Technology, Volume 47, pp 4521-4527; https://doi.org/10.1021/es304971h

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