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

Giménez-Mañogil, Javier; Garcı́a-Garcı́a, Avelina

doi:10.1016/j.fuproc.2014.09.018

Cited by 23 publications

(17 citation statements)

References 49 publications

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“…CO. An effective delivery and transfer of active oxygen from the catalyst to the soot surface are the main factors governing the soot combustion under O2 alone as well [38,39].…”

Section: Fig 8 Depicts the Soot Conversions Profiles Versus Temperatmentioning

confidence: 99%

“…The importance of the high efficiency of NO ↔ NO2 ↔ soot cycle has been reported by some researchers [34,[39][40][41][42][43] but mainly in the context of Pt-based catalysts. It has been demonstrated that the NO2 derived from NO oxidation would react with soot and initiate the creation of surface oxygenated complexes, (SOCs), which are more reactive than the complexes previously existing on soot's surface.…”

Section: < Near Figure 9 >mentioning

confidence: 99%

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Catalytic activity of Cu and Co supported on ceria-yttria-zirconia oxides for the diesel soot combustion reaction in the presence of NOx

Yeste

Cauqui

Giménez-Mañogil

et al. 2020

Chemical Engineering Journal

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In this work, copper and cobalt oxides supported on a ceria-yttria-stabilized zirconia (Ce-YSZ) have been studied as alternative to noble metals for the soot removal in diesel engines. The Ce-YSZ support was activated in order to obtain a catalyst with a high redox performance. The resulting catalysts were characterized by N2 physisorption, ICP, XRD, TPR-H2, TPR-CO, HAADF-STEM and XEDS.Additionally, their catalytic performance was evaluated in the NO oxidation to NO2 and in the combustion of soot in presence/absence of NOx. The Co/Ce-YSZ catalyst shows a maximum NO2 production activity higher than 70%, very close to that obtained with a commercial Pt catalyst used as a reference, and largely better than that of Cu/Ce-YSZ. A similar trend is observed in the combustion of soot in the presence of NOx, thus indicating the prevalence of the NO2-assisted mechanism for the oxidation of soot when NO2 is present. Results obtained with unsupported Co3O4and CuO oxides suggest that Co-containing catalyst is not only a better NO2 generator but also exhibits a more efficient utilization of NOx. Co3O4 entities would act as a pseudo-platinum phase allowing fresh supply of NO2 along the catalytic bed, thus accelerating the soot combustion reaction.However, if NOx is absent, the order of soot combustion rate matches with the performance in reducibility ("active oxygen" mechanism), the Cu catalyst being the most active in comparison with Co or Pt. Under these conditions, Ce-YSZ supported catalysts benefit from the excellent oxygenexchange properties of surface Ce-Y-Zr oxide nanostructures.

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“…CO. An effective delivery and transfer of active oxygen from the catalyst to the soot surface are the main factors governing the soot combustion under O2 alone as well [38,39].…”

Section: Fig 8 Depicts the Soot Conversions Profiles Versus Temperatmentioning

confidence: 99%

Section: < Near Figure 9 >mentioning

confidence: 99%

Catalytic activity of Cu and Co supported on ceria-yttria-zirconia oxides for the diesel soot combustion reaction in the presence of NOx

Yeste

Cauqui

Giménez-Mañogil

et al. 2020

Chemical Engineering Journal

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“…5,7 Diesel particulate lters (DPFs) combined with catalytic combustion of renewable technology is considered to be an efficient aer-treatment of soot oxidation; 3,5,[8][9][10] an effective catalyst with a lower light-off temperature is extremely important for DPF regeneration. 5,7,[9][10][11][12][13] Recently, CeO 2 has not only been reported to be used successfully in three-way catalysts, [14][15][16][17] but also as an excellent catalyst for soot combustion, 3,7,12,[18][19][20] because of its remarkable oxygen storage capacity (OSC) and redox property.…”

Section: -6mentioning

confidence: 99%

“…The preparation methods of CeO 2 -based catalysts mainly include coprecipitation, 3,5,7,8,12,13,22,27,30,31,39 hydrothermal, [40][41][42] citric acid complex combustion, 23 sol-gel, 2,33,43,44,46-48 solution combustion, 40,41 solid-state, 26 impregnation, 45 (inverse) microemulsion, 25,32,35 and solid-phase grinding methods. 34,35 Among them, the solid-phase grinding method is the easiest technique to control the positions of the metal atoms in the structure.…”

Section: 14mentioning

confidence: 99%

Design structure for CePr mixed oxide catalysts in soot combustion

Fan

Zhu

et al. 2017

RSC Adv.

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Four CePr mixed oxides with different structures were designed and synthesized using a solid-phase grinding method: a uniform solid solution of Ce and Pr (CePr-NN), Pr 6 O 11 -coated CeO 2 (CePr-NO), CeO 2 -coated Pr 6 O 11 (CePr-ON), and particle packing of CeO 2 and Pr 6 O 11 (CePr-OO) were obtained, and characterized by XRD, H 2 -TPR, TEM and TG. The results show that CePr-NN exhibits the best low temperature catalytic activity among the CePr catalysts. CeO 2 is the major active phase on the surface of the CePr catalysts, and the use of Pr 6 O 11 as the framework maintains the thermal stability of the CePr composite oxide. Moreover, both the oxygen storage capacity and mobility of the active oxygen of the catalyst were improved with the incorporation of Pr into CeO 2 , resulting in a higher combustion rate. The "molten state" which appeared during the preparation when nitrate was used as the precursor, plays a significant role in the migration of Ce and Pr, and is the premise of forming different structures of solid solution or coating structure.

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“…The reason for the addition of copper to the ceria-zirconia support, the choice of the particular formulation 2% CuO/Ce 0.8 Zr 0.2 O 2 and its inuence both on the soot combustion activities and on the mechanism were properly described elsewhere. 25,33,34 …”

Section: Introductionmentioning

confidence: 99%

Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot

2015

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This work presents a comparative study between the catalytic performance of the 2% CuO/ceria-zirconia powder catalyst and the same catalyst supported on silicon carbide DPF (Diesel Particulate Filter) towards NO oxidation reaction and soot combustion reaction. The ceria-zirconia catalyst was prepared by the coprecipitation method and 2 wt% copper was incorporated by the incipient wetness impregnation method. The catalyst was incorporated onto the ceramic support using a simple and organic solvent-free procedure by a simply dipping the DPF into an aqueous solution of the catalyst. The powder catalyst has been characterized using N 2 adsorption at À196 C, XRD and Raman Spectroscopy; whereas the catalytic coating morphology has been evaluated by SEM and the mechanical stability by an adherence test. Both catalyst configurations were tested for NO oxidation to NO 2 and for soot combustion under NO x /O 2 .The results revealed that incorporation of the very active copper/ceria-zirconia catalyst onto SiC-DPF has been successfully achieved by a simple coating procedure. Furthermore, the catalytic coating has shown suitable mechanical, chemical and thermal stability. A satisfactory catalytic performance of the catalytic-coated filter was reached towards the NO oxidation reaction. Moreover, it was proved that the catalytic coating is stable and the corresponding coated DPF can be reused for several cycles of NO oxidation without a significant decrease in its activity. Finally, it was verified that the loose-contact mode is a good choice to simulate the catalytic performance of this active phase in a real diesel particulate filter.

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

Cited by 23 publications

References 49 publications

Catalytic activity of Cu and Co supported on ceria-yttria-zirconia oxides for the diesel soot combustion reaction in the presence of NOx

Catalytic activity of Cu and Co supported on ceria-yttria-zirconia oxides for the diesel soot combustion reaction in the presence of NOx

Design structure for CePr mixed oxide catalysts in soot combustion

Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot

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

Cited by 23 publications

References 49 publications

Catalytic activity of Cu and Co supported on ceria-yttria-zirconia oxides for the diesel soot combustion reaction in the presence of NOx

Catalytic activity of Cu and Co supported on ceria-yttria-zirconia oxides for the diesel soot combustion reaction in the presence of NOx

Design structure for CePr mixed oxide catalysts in soot combustion

Catalytic performance of CuO/Ce0.8Zr0.2O2 loaded onto SiC-DPF in NOx-assisted combustion of diesel soot

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Catalytic performance of CuO/Ce_0.8Zr_0.2O₂ loaded onto SiC-DPF in NO_x-assisted combustion of diesel soot