An optimal NOx assisted abatement of diesel soot in an advanced catalytic filter design

Setiabudi, Agus; Makkee, Michiel; Moulijn, Jacob A.

doi:10.1016/s0926-3373(02)00213-8

Cited by 99 publications

(50 citation statements)

References 19 publications

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“…Therefore, the recycle reaction of NO to NO 2 and the soot combustion under NO 2 (and O 2 ) are coupled. These findings are in close agreement with results reported in the literature [21,22,28].…”

Section: Resultssupporting

confidence: 94%

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Behavior of different soot combustion catalysts under NOx/O2. Importance of the catalyst–soot contact

Guillén-Hurtado

López-Suárez

Bueno‐López

et al. 2013

Reac Kinet Mech Cat

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Four different catalysts (Pt/Al 2 O 3 , Ce 0.8 Zr 0.2 O 2 , PrO 2-x and SrTiCuO 3 ) have been investigated in a laboratory scale to evaluate its potential as diesel soot catalysts under different experimental conditions, which simulate the situation found in a Continuously Regeneration Technology trap (dual-bed configuration of catalyst and soot) or a CatalystCoated Filter system, (single-bed configuration, both catalyst and soot particles mixed under loose-contact mode). Under dual-bed configuration, the catalysts' behaviours towards soot combustion are very similar, despite of the differences observed in the NO 2 production profiles. However, under single-bed configuration, there are important differences in the soot combustion activities and in the NO 2 slip profiles. The configurations chosen have an enormous impact on CO/(CO+CO 2 ) ratios of combustion products as well. The most active catalyst under NOx+O 2 is PrO 2-x combining high contribution of active oxygen-assisted soot combustion as well as high NO 2 production activity along the catalytic bed.

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Section: Resultssupporting

confidence: 94%

“…This explains the significantly higher combustion rate for the single-bed configuration than that of the dual-bed configuration. Similar results were found by Setiabudi et al at laboratory scale testing Pt-impregnated ceramic foam [21,22].…”

Section: Resultssupporting

confidence: 89%

Behavior of different soot combustion catalysts under NOx/O2. Importance of the catalyst–soot contact

Guillén-Hurtado

López-Suárez

Bueno‐López

et al. 2013

Reac Kinet Mech Cat

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“…For practical applications this calls for a separate catalytic function, viz., the oxidation of NO into NO 2 . In the CRT system [24] and recently published paper on the improvements of CRT [25], this is demonstrated.…”

Section: Drift Analysis Of O 2 No 2 and No 2 /O 2 -Exposed Soot mentioning

confidence: 89%

The role of NO2 and O2 in the accelerated combustion of soot in diesel exhaust gases

Setiabudi

Makkee

Moulijn

2004

Applied Catalysis B: Environmental

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289

195

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The role of NO 2 and O 2 in the combustion of soot was investigated by analysing the soot combustion characteristic and the DRIFT spectra of surface oxygen complexes (SOCs) as soot oxidation intermediates. It is found that in NO 2 /O 2 -soot, like in the CRT system, the oxidation of soot is initiated by the NO 2 -soot reaction to create SOCs as intermediates. O 2 reacts with SOCs, eventually yielding CO and/or CO 2 . This mechanism results in a higher oxidation rate when NO 2 -soot reaction occurs in the presence of O 2 . The potential of using Printex-U, a flame soot, in exploratory diesel soot combustion studies is discussed. It is concluded that in general this is the case except for the fact that real soot can contain adsorbed hydrocarbons that will increase the reactivity of the soot in the absence of NO 2 .

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“…Working under realistic soot-catalyst contact (loose contact) implies that mass transfer limitations could become very important, thus decreasing the overall reaction rate. For this reason, the tight contact mode has been widely used to obtain kinetic data of the catalytic soot combustion [37][38][39]. However, it is necessary to obtain reaction rates under loose contact in order to determine intrinsic kinetics to achieve an efficient design and operation of the DPFcoated system.…”

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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An optimal NOx assisted abatement of diesel soot in an advanced catalytic filter design

Cited by 99 publications

References 19 publications

Behavior of different soot combustion catalysts under NOx/O2. Importance of the catalyst–soot contact

Behavior of different soot combustion catalysts under NOx/O2. Importance of the catalyst–soot contact

The role of NO2 and O2 in the accelerated combustion of soot in diesel exhaust gases

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

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