Nature and thermal stability of adsorbed intermediates formed during the reaction of diesel soot with nitrogen dioxide

Azambre, B.; Collura, Salvatore; Trichard, Jean-Michel; Weber, J.V.

doi:10.1016/j.apsusc.2006.04.027

Cited by 54 publications

(51 citation statements)

References 26 publications

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“…This highest amount should be connected to the enhanced NO 2 production from low temperatures (150°C), which seems to produce more SOCs on soot surface which eventually will lead to a higher CO 2 production (which means lower CO/(CO+CO 2 ) ratio) for Pt/Al 2 O 3 under dualbed configuration. This is in agreement with previous results reported by Azambre et al [27].…”

Section: Resultssupporting

confidence: 84%

“…Subsequent TPD analyses showed NO 2 , NO and CO 2 as main products detected, when enough intermediates' coverage was achieved [27]. Therefore, significant CO productions under our experimental conditions suggest relevant contribution of O 2 -combustion pathway, with the oxidation rate being controlled by the concentration of O 2 in the gas phase and its diffusion throughout the soot bed, in agreement with literature [28], thus yielding similar soot conversion curves.…”

Section: Resultssupporting

confidence: 77%

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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: 84%

Section: Resultssupporting

confidence: 77%

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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“…In the absence of NO x , active oxygen yielded by ceria catalysts is able to perform soot oxidation [1] and surface oxygen may increase the soot oxidation rate by Mars and Van Krevelen spillover mechanism [2]. On the other hand, it is well-known that NO 2 is a much stronger oxidant than NO and O 2 [3], and ceria-based materials are highly effective for the regeneration of soot traps because they oxidise NO to NO 2 very efficiently.…”

Section: Introductionmentioning

confidence: 99%

NOx Adsorption/Desorption Processes Over Ce0.76Zr0.24O2 and Their Influence on DeSoot Activity: Effect of the Catalyst Calcination Temperature

Atribak

Azambre²,

Bueno‐López

et al. 2009

Top Catal

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The catalytic activity of a Ce 0.76 Zr 0.24 O 2 mixed oxide, calcined at different temperatures, for soot oxidation under NO x /O 2 was correlated with the catalytic activity for NO 2 production. The Ce 0.76 Zr 0.24 O 2 mixed oxide samples were prepared by co-precipitation and calcination at different temperatures: 500-1000°C. A satisfactory correlation between the total amount of NO 2 desorbed after NO ? O 2 adsorption at 60°C and the T50% for soot combustion was found. The NO x adsorption process was also explored by in situ DRIFTS.

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“…In Fig. 8, the adsorptions at 1725 ,81,736, and 1788 cm À1 , assigned to carboxyls, lactones, and anhydrides, respectively, do not show any changes when the temperature is increased to 400°C [19]. Similarly, the bands at 1349 cm À1 (free ionic nitrates) and 1526 cm À1 (monodentate nitrates) are stabile with respect to temperature.…”

Section: Structural Characteristics Of Soot and Surface Carbon-oxygenmentioning

confidence: 78%

“…Moreover, the band at 1508 cm À1 may arise from the stretching vibrations of monodentate nitrates. The nitrates formed on the carbon surface are dissociative, because they are readily desorbed into the gaseous phase if the sample is flushed with helium [19]. The band at 1430 cm À1 is probably attributed to the vibration of NO 2 in CANO 2 .…”

Section: Structural Characteristics Of Soot and Surface Carbon-oxygenmentioning

confidence: 99%

Characterization of the NO-soot combustion process over La0.8Ce0.2Mn0.7Bi0.3O3 catalyst

Bin¹,

Chen²,

Lv³

et al. 2015

Proceedings of the Combustion Institute

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Nature and thermal stability of adsorbed intermediates formed during the reaction of diesel soot with nitrogen dioxide

Cited by 54 publications

References 26 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

NOx Adsorption/Desorption Processes Over Ce0.76Zr0.24O2 and Their Influence on DeSoot Activity: Effect of the Catalyst Calcination Temperature

Characterization of the NO-soot combustion process over La0.8Ce0.2Mn0.7Bi0.3O3 catalyst

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