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Aspects of multifunctional diesel particulate filters and their efficient simulation

Paper ID Volume ID Publish Year Pages File Format Full-Text
55459 47054 2012 12 PDF Available
Title
Aspects of multifunctional diesel particulate filters and their efficient simulation
Abstract

Following the successful market introduction of diesel particulate filters (DPFs), this class of emission control devices is expanding to include functionalities, in addition to particle filtration, such as gas species oxidation and reduction to the extent that we should today refer to them as Multifunctional Reactor Separators. This trend poses many challenges for the modeling of such systems. In the present paper we address mathematical descriptions of some specific aspects of multifunctional DPFs for inclusion in comprehensive simulation tools in a physically accurate and computationally efficient manner. In particular, we study the behavior of thin, coating layers on top of the filter wall, and their effect on particle collection efficiency and pressure drop with the aid of Digital Material techniques that provided a guidance for the development of coated DPFs with added particle collection efficiency and lower pressure drop during soot loading. Soot–catalyst contact dynamics during soot oxidation by catalytic coatings was investigated with the application of a model including the distribution of different soot–catalyst contact states which is shown to be in very good agreement with the experimental data. Finally an analytical framework has been developed to describe the reactions of exhaust gas species in a DPF wall endowed both with a gas oxidation function and a reducing function (based on NH3-Selective Catalytic Reduction). The developments can be readily incorporated in DPF simulation tools, and enable the efficient and accurate simulation of multifunctional DPFs.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (223 K)Download as PowerPoint slideHighlights► We describe accurate and efficient mathematical models for multifunctional DPFs. ► We model the effect of coating layers on particle collection efficiency and pressure drop. ► We study the soot–catalyst contact dynamics during soot oxidation. ► We study the reactions of exhaust gas species in a catalytic DPF wall.

Keywords
Diesel particulate filter; Simulation; Multifunctional reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 188, Issue 1, 1 July 2012, Pages 2–13
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us