Kinetics of catalyzed and non-catalyzed oxidation of soot from a diesel engine

Darcy, Pierre; Costa, Patrick Da; Mellottée, H.; Trichard, Jean-Michel; Djéga‐Mariadassou, Gérald

doi:10.1016/j.cattod.2006.08.056

Cited by 91 publications

(70 citation statements)

References 7 publications

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“…In the literature several papers have been published on the combustion of carbonaceous materials that mention this kind of model [19][20][21][22][23][24][25][26][27][28][29]. It is well known that the system under study is very complex, which is due to different phenomena that occur on the gas-solid (gas-soot and gas-catalyst) and solid-solid (catalyst-soot) interfaces.…”

Section: Kinetic Modelmentioning

confidence: 99%

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Catalytic combustion of diesel soot: Experimental design for laboratory testing

Peralta

Gross

Sánchez

et al. 2009

Chemical Engineering Journal

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Section: Kinetic Modelmentioning

confidence: 99%

“…Elemental analysis of soot [17][18][19][20][21][22][23][24][25][26][27][28][29][30] indicates that carbon is the main component, and therefore the stoichiometry proposed for the global reaction is:…”

Section: Kinetic Modelmentioning

confidence: 99%

Catalytic combustion of diesel soot: Experimental design for laboratory testing

Peralta

Gross

Sánchez

et al. 2009

Chemical Engineering Journal

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“…Among the several catalysts used for soot combustion, the most common are: molten salts [14][15][16][17], Pt-based oxides [18][19][20][21], ceria-based oxides [18,19,[22][23][24][25][26][27][28], and others based on transition metals (such as copper or iron) [20,24,26,[29][30][31][32][33][34]. Although those catalysts containing Pt show a very high activity in the NO oxidation to NO 2 (and thus, promoting soot combustion), some other catalysts are being developed, whose NO 2 production activities are becoming closer to those of Pt-based catalysts, but with lower costs.…”

Section: Introductionmentioning

confidence: 99%

Opportunities for ceria-based mixed oxides versus commercial platinum-based catalysts in the soot combustion reaction. Mechanistic implications

Giménez-Mañogil¹,

Garcı́a-Garcı́a²

2015

Fuel Processing Technology

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The aim of this paper is to study the activities of ceria-zirconia and copper/ceriazirconia catalysts, comparing with a commercial platinum/alumina catalyst, for soot combustion reaction under different gas atmospheres and loose contact mode (simulating diesel exhaust conditions), in order to analyse the kinetics and to deduce mechanistic implications.Activity tests were performed under isothermal and TPR conditions. The NO oxidation to NO 2 was studied as well. It was checked that mass transfer limitations were not influencing the rate measurements. Global activation energies for the catalysed and non-catalysed soot combustion were calculated and properly discussed.The results reveal that ceria-based catalysts greatly enhance their activities under NOx/O 2 between 425ºC and 450ºC, due to the "active oxygen"-assisted soot combustion. Remarkably, copper/ceria-zirconia shows a slightly higher soot combustion rate than the Pt-based catalyst (under NOx/O 2 , at 450ºC).

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“…The catalyst effect on the carbon oxidation occurs in the first layer only and is determined by a criterion for the fraction of soot that has been oxidized with the help of the catalyst: the index β. On the catalytic layer surface β is equal to 0.5, as was suggested by Darcy et al [35], and inside the second layer β=0. In the first layer the following dependence of β on a distance from the channel wall x is proposed:…”

Section: Basic Equationsmentioning

confidence: 70%

Modeling of the Regeneration Processes in Diesel Particulate Filters

Tartakovsky¹,

Aronov²,

Zvirin³

2012

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New simulation algorithm of soot oxidation in diesel particulate filter (DPF) is proposed. Two-dimensional finite differences scheme is used for calculation of the heat transfer in DPF (macro-scale). One dimensional model for treatment of the soot oxidation process in a separate filter channel (micro-scale) is based on a new expression for the oxidation reaction rate that is a modification of the known Bissett's equation. This expression allows consideration of the non-linear dependence of oxidation reaction rate on a reagent concentration. For cases of catalytic coating a modification of the known two-layer model is suggested. A fraction of soot that has been oxidized with the help of the catalyst is not invariable in the first layer, but it exponentially depends on the distance from a channel wall of the particle trap. Soot oxidation by O 2 and/or NO 2 in diesel particulate filters is investigated for various cases of non-catalytic and catalytic oxidation. The filter clogging propagation from its periphery to the center at critical temperature is described theoretically at first. A comparison between various types of DPF regeneration methods is performed by using the proposed simple simulation algorithm and appropriate computer code.

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Kinetics of catalyzed and non-catalyzed oxidation of soot from a diesel engine

Cited by 91 publications

References 7 publications

Catalytic combustion of diesel soot: Experimental design for laboratory testing

Catalytic combustion of diesel soot: Experimental design for laboratory testing

Opportunities for ceria-based mixed oxides versus commercial platinum-based catalysts in the soot combustion reaction. Mechanistic implications

Modeling of the Regeneration Processes in Diesel Particulate Filters

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