Tailoring the efficiency of an active catalyst for CO abatement through oxidation reaction: The case study of samarium-doped ceria

Polychronopoulou, Kyriaki; Zedan, Abdallah F.; AlKetbi, M.; Samuel, Stephen; Ather, Madeeha; Katsiotis, Marios S.; Arvanitidis, J.; Christofilos, D.; Isakovic, A. F.; Alhassan, Saeed M.

doi:10.1016/j.jece.2017.12.001

Cited by 29 publications

(20 citation statements)

References 98 publications

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“…For a quantitative evaluation, the T 50% can be considered, namely the temperature at which 50% of the incoming CO is oxidized. The Ce50Pr50 sample was able to reach such a conversion at only 359 • C in high oxygen excess, exhibiting a specific reaction rate of the CO oxidation of 47.16 µmol CO /h/m 2 at this temperature, while the T 50% of pure CeO 2 was 413 • C. Nanostructured ceria-praseodymia is therefore more efficient towards CO abatement with respect to pure ceria [18,21,25] and to Pr-doped ceria synthesized with different techniques [27,39].…”

Section: Catalytic Activitymentioning

confidence: 94%

“…Catalysts 2020, 10, x FOR PEER REVIEW 7 of 16 efficient towards CO abatement with respect to pure ceria [18,21,25] and to Pr-doped ceria synthesized with different techniques [27,39]. The great activity of the Ce50Pr50 catalyst seems to be preserved even when the oxygen availability in the gas phase is limited: indeed, the conversion curve obtained in low-oxygen conditions is quite similar to that measured by feeding the reactor with 10% of oxygen, and the T50% is just 20 °C higher (see Table 2).…”

Section: Catalytic Activitymentioning

confidence: 99%

“…Ceria properties can be further tuned by inserting certain dopant ions into its crystal structure, in order to improve the activity and stability of the catalytic system. The addition of a foreign element promotes the formation of different kinds of defects in ceria lattice, e.g., oxygen vacancies, which have been recognized to play an active role during catalysis [16][17][18][19][20]. In fact, the oxidation reactions are believed to occur via a Mars-van Krevelen-type mechanism over ceria-based catalysts, involving the formation and refilling of oxygen vacancies [11,21].…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured Equimolar Ceria-Praseodymia for Total Oxidations in Low-O2 Conditions

et al. 2020

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A Gasoline Particulate Filter (GPF) can be an effective solution to abate the particulate matter produced in modern direct injection gasoline engines. The regeneration of this system is critical, since it occurs in oxygen deficiency, but it can be promoted by placing an appropriate catalyst on the filter walls. In this paper, a nanostructured equimolar ceria-praseodymia catalyst, obtained via hydrothermal synthesis, was characterized with complementary techniques (XRD, N2-physisorption, FESEM, XPS, Temperature Programmed Reduction, etc.) and its catalytic performances were investigated in low oxygen availability. Pr-doping significantly affected ceria structure and morphology, and the weakening of the cerium–oxygen bond associated to Pr insertion resulted in a high reducibility. The catalytic activity was explored considering different reactions, namely CO oxidation, ethylene and propylene total oxidation, and soot combustion. Thanks to its capability of releasing active oxygen species, ceria-praseodymia exhibited a remarkable activity and CO2-selectivity at low oxygen concentrations, proving to be a promising catalyst for coated GPFs.

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Section: Catalytic Activitymentioning

confidence: 94%

Section: Catalytic Activitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanostructured Equimolar Ceria-Praseodymia for Total Oxidations in Low-O2 Conditions

et al. 2020

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“…Citric acid (the complexing agent) was dissolved in distilled water, maintaining the total metal loading to citric acid ratio (Mtot/citric acid) at 0.75, yielding an excess of citric acid. The metal salt and citric acid solutions were then mixed and the final solution was subjected to microwave heating (130 °C/800W) and stirring until a yellowish gel was formed, as explained in recent works by Polychronopoulou et al [ 51 , 52 ]. Following microwave heating, all synthesized materials were calcined at 500 °C for 6 h under atmospheric conditions to form the mixed oxide catalyst.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Ni Addition onto a Cu-Based Ternary Support on the H2 Production over Glycerol Steam Reforming Reaction

et al. 2018

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In the present study, Ni/Ce-Sm-xCu (x = 5, 7, 10 at.%) catalysts were prepared using microwave radiation coupled with sol-gel and followed by wetness impregnation method for the Ni incorporation. Highly dispersed nanocrystallites of CuO and NiO on the Ce-Sm-Cu support were found. Increase of Cu content seems to facilitate the reducibility of the catalyst according to the H2 temperature-programmed reduction (H2-TPR). All the catalysts had a variety of weak, medium and strong acid/basic sites that regulate the reaction products. All the catalysts had very high XC3H8O3 for the entire temperature (400–750 °C) range; from ≈84% at 400 °C to ≈94% at 750 °C. Ni/Ce-Sm-10Cu catalyst showed the lowest XC3H8O3-gas implying the Cu content has a detrimental effect on performance, especially between 450–650 °C. In terms of H2 selectivity (SH2) and H2 yield (YH2), both appeared to vary in the following order: Ni/Ce-Sm-10Cu > Ni/Ce-Sm-7Cu > Ni/Ce-Sm-5Cu, demonstrating the high impact of Cu content. Following stability tests, all the catalysts accumulated high amounts of carbon, following the order Ni/Ce-Sm-5Cu < Ni/Ce-Sm-7Cu < Ni/Ce-Sm-10Cu (52, 65 and 79 wt.%, respectively) based on the thermogravimetric analysis (TGA) studies. Raman studies showed that the incorporation of Cu in the support matrix controls the extent of carbon graphitization deposited during the reaction at hand.

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“…27 For many carbon materials, they not only possess higher ORR activity (eg, heteroatoms-doped fullerene mentioned above) but also have excellent catalytic activity for CO oxidation, such as heteroatoms-doped graphene. 28,29 Besides, some kinds of CO oxidation catalysts such as metal-based material [30][31][32][33][34] and amorphous metal-organic frameworks (MOFs) 35 have been studied in detail. The current paper mainly focuses on the ORR and CO oxidation reaction catalyzed by metal-fullerene C 58 M (M = Mn, Ni, Co, Fe, and Cu).…”

Section: Introductionmentioning

confidence: 99%

Exploring the catalytic activity of metal‐fullerene C ₅₈ M (M = Mn, Fe, Co, Ni, and Cu) toward oxygen reduction and CO oxidation by density functional theory

Chen

Chang

et al. 2019

Int J Energy Res

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Summary In the present work, the catalytic activity of metal‐fullerene C58M (M = Mn, Fe, Co, Ni, and Cu) toward oxygen reduction reaction (ORR) and CO oxidation has been explored by detailed density functional theory calculations. Firstly, the binding energy of various ORR species (OOH, O, and OH) on C58M and the corresponding adsorption structures are calculated. The results show that the adsorption strength of any ORR species on C58M follows the order of C58Mn > C58Fe > C58Co > C58Ni > C58Cu and C58Co shows the closest binding energy compared with the Pt(111) surface. Further analysis of the free energy change of ORR indicates that C58Co, C58Ni, and C58Fe have different degrees of catalytic activities, with the calculated free energy change of rate‐determining step of −0.70, −0.32, and −0.04 eV, respectively. On the basis of the above results, the C58Co obviously has the highest ORR activity, with a relatively small overpotential of 0.53 V. In addition, the adsorption free energy of OH can be used as a good descriptor for ORR activity due to the nearly linear relationships between ∆G*OOH, ∆G*O, and ∆G*OH. At last, the catalytic property of C58Co toward CO oxidation reaction is also explored. The calculated results show that CO oxidation on C58Co follows LH mechanism and the rate‐determining step is recognized as *CO + *O2 → *OOCO, with the energy change of −0.13 eV.

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Tailoring the efficiency of an active catalyst for CO abatement through oxidation reaction: The case study of samarium-doped ceria

Cited by 29 publications

References 98 publications

Nanostructured Equimolar Ceria-Praseodymia for Total Oxidations in Low-O2 Conditions

Nanostructured Equimolar Ceria-Praseodymia for Total Oxidations in Low-O2 Conditions

The Effect of Ni Addition onto a Cu-Based Ternary Support on the H2 Production over Glycerol Steam Reforming Reaction

Exploring the catalytic activity of metal‐fullerene C ₅₈ M (M = Mn, Fe, Co, Ni, and Cu) toward oxygen reduction and CO oxidation by density functional theory

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Tailoring the efficiency of an active catalyst for CO abatement through oxidation reaction: The case study of samarium-doped ceria

Cited by 29 publications

References 98 publications

Nanostructured Equimolar Ceria-Praseodymia for Total Oxidations in Low-O2 Conditions

Nanostructured Equimolar Ceria-Praseodymia for Total Oxidations in Low-O2 Conditions

The Effect of Ni Addition onto a Cu-Based Ternary Support on the H2 Production over Glycerol Steam Reforming Reaction

Exploring the catalytic activity of metal‐fullerene C 58 M (M = Mn, Fe, Co, Ni, and Cu) toward oxygen reduction and CO oxidation by density functional theory

Contact Info

Product

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Exploring the catalytic activity of metal‐fullerene C ₅₈ M (M = Mn, Fe, Co, Ni, and Cu) toward oxygen reduction and CO oxidation by density functional theory