Tuning the activity of Cu-containing rare earth oxide catalysts for CO oxidation reaction: Cooling while heating paradigm in microwave-assisted synthesis

AlKetbi, M.; Polychronopoulou, Kyriaki; Zedan, Abdallah F.; Sebastián, Víctor; Baker, Mark; AlKhoori, Ayesha A.; Alnuaimi, O.; Hinder, Steve S.; Anjana, Tharalekshmy; Aljaber, Amina S.

doi:10.1016/j.materresbull.2018.08.045

Cited by 27 publications

(49 citation statements)

References 47 publications

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“…This seems to be contradictory if the scenario of a substitutional solid solution of Cu in the Ce-Sm-O cubic lattice is adopted given the smaller size of the Cu 2+ cations (0.73 Å). It is likely that Cu has been introduced interstitially into the Ce-Sm-O cubic lattice, in agreement with previous work [ 53 ]. Addition of the Ni 2+ cation (0.72 Å) caused an additional small expansion corroborating for the interstitial addition of Ni 2+ cations.…”

Section: Resultssupporting

confidence: 91%

“… According to many literature reports, the reduction of single ceria takes place at ≈500 and 830 °C for the surface and the bulk oxygen species, respectively [ 52 ]. The low temperature reduction peak at 150 °C can be linked to the reduction of amorphous CuO, in weak interaction with the support, whereas in the 150–200 °C range, the reduction of CuO in strong interaction with the support and the partial reduction of surface CeO 2 at the metal support interface takes place [ 53 , 65 , 66 ]. The peak above 200 °C can be assigned to highly dispersed NiO [ 53 , 65 , 66 ].…”

Section: Resultsmentioning

confidence: 99%

“… The low temperature reduction peak at 150 °C can be linked to the reduction of amorphous CuO, in weak interaction with the support, whereas in the 150–200 °C range, the reduction of CuO in strong interaction with the support and the partial reduction of surface CeO 2 at the metal support interface takes place [ 53 , 65 , 66 ]. The peak above 200 °C can be assigned to highly dispersed NiO [ 53 , 65 , 66 ]. Among the catalysts presented in Figure 7 , the Ni/Ce-Sm-5Cu has the highest reduction temperature (284 °C) compared to the Ni-Ce-Sm-7Cu (261 °C) and Ni-Ce-Sm-10Cu (198 °C) and this can be due to the Cu-rich character of this catalyst (Ni/Cu = 0.37) corroborating for some incorporation of the Ni into the ceria fluorite structure, and thus, suppressing its reduction.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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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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“…This is because of the possible sintering and structural deterioration that could decrease the number of active sites [24]. On the other hand, nanocrystalline Cu-based materials have been shown to be suitable for non-precious heterogenous catalysts, with notable performance in gas-phase catalytic oxidation reactions [25,26]. The synergetic interactions between copper and cerium in copper-ceria catalytic systems could lead to improved activity for catalytic oxidation reactions [27,28].…”

Section: Introductionmentioning

confidence: 99%

Combustion Synthesis of Non-Precious CuO-CeO2 Nanocrystalline Catalysts with Enhanced Catalytic Activity for Methane Oxidation

Zedan

Aljaber

2019

Materials

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In this study, xCuO-CeO2 mixed oxide catalysts (Cu weight ratio x = 1.5, 3, 4.5, 6 and 15 wt.%) were prepared using solution combustion synthesis (SCS) and their catalytic activities towards the methane (CH4) oxidation reaction were studied. The combustion synthesis of the pure CeO2 and the CuO-CeO2 solid solution catalysts was performed using copper and/or cerium nitrate salt as an oxidizer and citric acid as a fuel. A variety of standard techniques, including scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were employed to reveal the microstructural, crystal, thermal and electronic properties that may affect the performance of CH4 oxidation. The CuO subphase was detected in the prepared solid solution and confirmed with XRD and Raman spectroscopy, as indicated by the XRD peaks at diffraction angles of 35.3° and 38.5° and the Ag Raman mode at 289 cm−1, which are characteristics of tenorite CuO. A profound influence of Cu content was evident, not only affecting the structural and electronic properties of the catalysts, but also the performance of catalysts in the CH4 oxidation. The presence of Cu in the CeO2 lattice obviously promoted its catalytic activity for CH4 catalytic oxidation. Among the prepared catalysts, the 6% CuO-CeO2 catalyst demonstrated the highest performance, with T50 = 502 °C and T80 = 556 °C, an activity that is associated with the availability of a fine porous structure and the enhanced surface area of this catalyst. The results demonstrate that nanocrystalline copper-ceria mixed oxide catalysts could serve as an inexpensive and active material for CH4 combustion.

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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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Tuning the activity of Cu-containing rare earth oxide catalysts for CO oxidation reaction: Cooling while heating paradigm in microwave-assisted synthesis

Cited by 27 publications

References 47 publications

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

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

Combustion Synthesis of Non-Precious CuO-CeO2 Nanocrystalline Catalysts with Enhanced Catalytic Activity for Methane Oxidation

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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Tuning the activity of Cu-containing rare earth oxide catalysts for CO oxidation reaction: Cooling while heating paradigm in microwave-assisted synthesis

Cited by 27 publications

References 47 publications

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

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

Combustion Synthesis of Non-Precious CuO-CeO2 Nanocrystalline Catalysts with Enhanced Catalytic Activity for Methane Oxidation

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

Resources

About

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