Ce1-xFexO2-δ catalysts for catalytic methane combustion: Role of oxygen vacancy and structural dependence

Li, Danyang; Li, Kongzhai; Xu, Ruidong; Wang, Hua; Tian, Dong; Wei, Yonggang; Zhu, Xing; Zeng, Chunhua; Zeng, Lewei

doi:10.1016/j.cattod.2017.12.015

Cited by 59 publications

(38 citation statements)

References 56 publications

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“…The effect of support morphology on the reducibility of the samples was investigated by TPR experiments. The reduction profiles of bare ceria samples are depicted in Figure 5 and they include two broad peaks centered at 526-551 • C and 789-813 • C, which are attributed to the surface oxygen (O s ) and bulk oxygen (O b ) ceria reduction, respectively [58,59]. As observed in Figure 5, in ceria nanocubes, the O s peak is smaller in comparison with ceria nanorods and nanopolyhedra due to the smaller amount of easily reducible oxygen available in the cubic sample, a fact closely related to the exposed crystal facets, as it has been reported in previous studies [45,60].…”

Section: Redox Properties (H 2 -Tpr)mentioning

confidence: 99%

“…The Ce 3d XPS spectra of the samples are shown in Figure 6a. The Ce3d core level spectra were deconvoluted into eight components consisting of three pairs of spin-orbit doublets of Ce 4+ and two peaks corresponding to Ce 3+ [44,59,65]. In particular, the Ce 3d 3/2 spin-obit components represented by the u lines include three characteristic peaks labeled as u (900.7 eV), u (907.6 eV), and u (916.4 eV).…”

Section: Surface Properties (Xps)mentioning

confidence: 99%

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Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

et al. 2019

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Ceria has been widely studied either as catalyst itself or support of various active phases in many catalytic reactions, due to its unique redox and surface properties in conjunction to its lower cost, compared to noble metal-based catalytic systems. The rational design of catalytic materials, through appropriate tailoring of the particles’ shape and size, in order to acquire highly efficient nanocatalysts, is of major significance. Iron is considered to be one of the cheapest transition metals while its interaction with ceria support and their shape-dependent catalytic activity has not been fully investigated. In this work, we report on ceria nanostructures morphological effects (cubes, polyhedra, rods) on the textural, structural, surface, redox properties and, consequently, on the CO oxidation performance of the iron-ceria mixed oxides (Fe2O3/CeO2). A full characterization study involving N2 adsorption at –196 °C, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) was performed. The results clearly revealed the key role of support morphology on the physicochemical properties and the catalytic behavior of the iron-ceria binary system, with the rod-shaped sample exhibiting the highest catalytic performance, both in terms of conversion and specific activity, due to its improved reducibility and oxygen mobility, along with its abundance in Fe2+ species.

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Section: Redox Properties (H 2 -Tpr)mentioning

confidence: 99%

Section: Surface Properties (Xps)mentioning

confidence: 99%

Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

et al. 2019

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“…Other transition metal doped catalysts were prepared by the co-precipitation method where a solution containing iron and cerium ammonium nitrates was treated with aqueous solution of 10% NH 3 . The precipitates were calcined after drying at 500 • C in air for 2 h, and the afforded mixed oxides, Ce 1-x Fe x O 2-δ , presented doping metal concentration in the range of 5%-40% (x = 0.05-0.4) [165]. Unexpectedly, the XRD diffraction patterns of all the samples showed the peaks ascribed to the fluorite cubic CeO 2 structure, however with no observation of diffraction peaks for Fe 2 O 3 phase, even in the more loaded Fe materials.…”

Section: Monometallic Modified Ceria Catalystsmentioning

confidence: 99%

Total Oxidation of Methane on Oxide and Mixed Oxide Ceria-Containing Catalysts

et al. 2021

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Methane, discovered in 1766 by Alessandro Volta, is an attractive energy source because of its high heat of combustion per mole of carbon dioxide. However, methane is the most abundant hydrocarbon in the atmosphere and is an important greenhouse gas, with a 21-fold greater relative radiative effectiveness than CO2 on a per-molecule basis. To avoid or limit the formation of pollutants that are dangerous for both human health and the atmospheric environment, the catalytic combustion of methane appears to be one of the most promising alternatives to thermal combustion. Total oxidation of methane, which is environmentally friendly at much lower temperatures, is believed to be an efficient and economically feasible way to eliminate pollutants. This work presents a literature review, a statu quo, on catalytic methane oxidation on transition metal oxide-modified ceria catalysts (MOx/CeO2). Methane was used for this study since it is of great interest as a model compound for understanding the mechanisms of oxidation and catalytic combustion on metal oxides. The objective was to evaluate the conceptual ideas of oxygen vacancy formation through doping to increase the catalytic activity for methane oxidation over CeO2. Oxygen vacancies were created through the formation of solid solutions, and their catalytic activities were compared to the catalytic activity of an undoped CeO2 sample. The reaction conditions, the type of catalysts, the morphology and crystallographic facets exposing the role of oxygen vacancies, the deactivation mechanism, the stability of the catalysts, the reaction mechanism and kinetic characteristics are summarized.

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“…8 Since the reaction was rst developed, it has attracted widespread attention. In this reaction, the main catalyst systems studied include noble metal catalysts and other transition metal catalysts, [9][10][11][12] among which Ni, Rh and Ru are considered to have the best catalytic performance for CO 2 hydromethanation. 13,14 Although Rh and Ru have higher activity and methane selectivity, their high price limits their industrial use.…”

Section: Introductionmentioning

confidence: 99%

“…17 Al 2 O 3 , TiO 2 , SiO 2 , ZrO 2 , and CeO 2 have been used as supports. 12,[18][19][20][21] Among these oxide support materials, ZrO 2 has excellent properties, including high thermal stability, abundant surface active sites, basic sites and oxygen vacancies, so ZrO 2 has been widely studied as a catalytic support. [22][23][24] At present, the CO 2 conversion rate of NiO/ZrO 2 catalyst is still not ideal.…”

Section: Introductionmentioning

confidence: 99%

Study on the performance of NiO/Zn_xZr_1−x catalysts for CO₂ hydrogenation

et al. 2020

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Ce1-xFexO2-δ catalysts for catalytic methane combustion: Role of oxygen vacancy and structural dependence

Cited by 59 publications

References 56 publications

Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

Total Oxidation of Methane on Oxide and Mixed Oxide Ceria-Containing Catalysts

Study on the performance of NiO/Zn_xZr_1−x catalysts for CO₂ hydrogenation

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Ce1-xFexO2-δ catalysts for catalytic methane combustion: Role of oxygen vacancy and structural dependence

Cited by 59 publications

References 56 publications

Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

Total Oxidation of Methane on Oxide and Mixed Oxide Ceria-Containing Catalysts

Study on the performance of NiO/ZnxZr1−x catalysts for CO2 hydrogenation

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Study on the performance of NiO/Zn_xZr_1−x catalysts for CO₂ hydrogenation