Catalytic regeneration of Diesel Particulate Filters: Comparison of Pt and CePr active phases

Pérez, Verónica Rico; Bueno‐López, Agustín

doi:10.1016/j.cej.2015.05.004

Cited by 57 publications

(18 citation statements)

References 34 publications

(37 reference statements)

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“…This effect implies a large difference between tight and loose contact as observed in the case of e.g., Mn 3 O 4 (immobile surface oxygen) and a smaller effect for KMn 4 O 8 (mobile surface oxygen). As reported in detailed investigations, in the catalytic cycle of soot combustion NO can be oxidized to NO 2 , which in turn oxidizes soot more effectively [51,52]. In such cases, it can be supposed that NO is preferentially oxidized on the investigated catalysts, transferring effectively the catalyst generated oxygen species into the soot particles.…”

Section: Catalytic Activitymentioning

confidence: 93%

Strong Enhancement of deSoot Activity of Transition Metal Oxides by Alkali Doping: Additive Effects of Potassium and Nitric Oxide

et al. 2016

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A series of potassium-promoted spinels (Mn, Fe, Co) were prepared with various K ? promoter locations: on the surface (surface promotion) or in the bulk (formation of new layered and tunneled nanostructures via solid state reaction). All prepared samples were characterized by means of X-ray diffraction, Raman spectroscopy, X-ray fluorescence and N 2 -BET specific surface area analysis. Catalytic activity in soot combustion in different reaction conditions was investigated (tight contact, loose contact, loose contact with NO addition). It was shown that in all cases the nanostructuration is more effective than the surface promotion, with the layered structures of KCo 4 O 8 , KMn 4 O 8 being the most catalytically active phases, lowering the soot combustion down to 250°C. The difference in activity between tight and loose contacts can be bridged in the presence of NO due to its transformation into NO 2 , which acts as the oxygen carrier from the catalyst surface into soot particles, eliminating the soot-catalyst contact difference.

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Section: Catalytic Activitymentioning

confidence: 93%

Strong Enhancement of deSoot Activity of Transition Metal Oxides by Alkali Doping: Additive Effects of Potassium and Nitric Oxide

et al. 2016

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“…Improved thermal stability and changes in the physicochemical properties of ceria are also obtained by introducing other metal ions into the ceria structure, which may change the redox properties and may favour the creation of the oxygen vacancies improving the oxygen mobility through the catalyst [12][13][14][15][16][17]. The most promising doped-ceria active phases seem to be those containing Pr, Zr or La as main dopant [18][19][20][21][22][23][24][25][26], where the optimum loading depends on the dopant size and on the resulting redox properties [27].…”

Section: Introductionmentioning

confidence: 99%

Synergic effect of Cu/Ce0.5Pr0.5O2-δ and Ce0.5Pr0.5O2-δ in soot combustion

Rico-Pérez

Aneggi

Bueno‐López

et al. 2016

Applied Catalysis B: Environmental

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Please cite this article in press as: V. Rico-Pérez, et al., Synergic effect of Cu/Ce 0.5 Pr 0.5 O 2-␦ and Ce 0.5 Pr 0.5 O 2-␦ in soot combustion, Appl. Catal. B: Environ. (2016), http://dx. a b s t r a c tA series of 5%Cu/Ce 0.5 Pr 0.5 O 2-␦ and Ce 0.5 Pr 0.5 O 2-␦ mixed oxides have been prepared and combined in different ratios. The resulting catalysts have been characterized by N 2 adsorption, XRD, Raman spectroscopy and H 2 -TPR and tested for soot combustion by means of temperature-programmed experiments. The optimum catalyst for soot combustion in NO x /O 2 /N 2 atmosphere is the mixture containing 40% Cu/Ce 0.5 Pr 0.5 O 2-␦ and 60% Ce 0.5 Pr 0.5 O 2-␦ . This mixture is more active than a reference catalyst containing the same amount of copper distributed in the whole Ce-Pr mixed oxide support. The benefit of mixing Ce 0.5 Pr 0.5 O 2-␦ particles with and without copper in a single catalyst formulation is that the participation of the two soot combustion mechanisms based on active oxygen and NO 2 , respectively, is optimized. The particles with copper mainly promote the catalytic oxidation of NO to NO 2 (the NO x -assisted mechanism) while those without copper are more effective in promoting the active oxygen mechanism. If copper is loaded homogeneously in all the Ce 0.5 Pr 0.5 O 2-␦ particles, the positive effect of copper improving NO 2 production is offset by the lower efficiency of the active oxygen mechanism, due to a lack of active oxygen on the Ce 0.5 Pr 0.5 O 2-␦ support.

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“…Deposition of transition metals (cobalt, copper and iron) doped with ceria oxide catalysts showed good soot oxidation activity and also reduced the ignition temperature of soot from 550 degree Celsius to 180-400 degree Celsius. Investigation on catalytic combustion of soot under CePr active phase was carried out in realistic reaction conditions by [44]. The results showed that ceria based catalysts are capable of accelerating soot combustion under real conditions.…”

Section: Catalyst Based Passive Regeneration Of Dpfmentioning

confidence: 99%

Review on Post-Treatment Emission Control Technique by Application of Diesel Oxidation Catalysis and Diesel Particulate Filtration

Kurien¹

2019

Journal of Thermal Engineering

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The toxic nature of exhaust gases released by these engines has led to environmental concerns, affecting its sustainability. The exhaust emission from diesel engine includes carbon monoxide, nitrates, hydrocarbons and particulate matter. Soot particles contained in the particulate matter is also found to be carcinogenic in nature and also leads to various lung diseases. Diesel oxidation catalysis system involves oxidation of hydrocarbons, nitrates and soluble organic fraction. Diesel particulate filtration blocks the soot particles with the help of alternately plugged diesel particulate filter with porous walls. The regeneration of accumulated soot is one of the major challenges faced by automotive industries for effective implementation of diesel particulate filtration system. A detailed review on the challenges faced in the implementation of emission control techniques has been carried out in this study and it has been explored from the results of literature study that microwave based regeneration technique would be an effective technique. This paper provides a platform for understanding the working principle of post treatment emission control techniques and also on the role of regeneration in effective operation of Diesel Particulate Filter.

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Catalytic regeneration of Diesel Particulate Filters: Comparison of Pt and CePr active phases

Cited by 57 publications

References 34 publications

Strong Enhancement of deSoot Activity of Transition Metal Oxides by Alkali Doping: Additive Effects of Potassium and Nitric Oxide

Strong Enhancement of deSoot Activity of Transition Metal Oxides by Alkali Doping: Additive Effects of Potassium and Nitric Oxide

Synergic effect of Cu/Ce0.5Pr0.5O2-δ and Ce0.5Pr0.5O2-δ in soot combustion

Review on Post-Treatment Emission Control Technique by Application of Diesel Oxidation Catalysis and Diesel Particulate Filtration

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