Methane catalytic combustion over CeO2-ZrO2-Sc2O3 mixed oxides

Toscani, Lucía M.; Curyk, Pablo A.; Zimicz, Maria Genoveva; Halac, Emilia B.; Saleta, M. E.; Lamas, Diego G.; Larrondo, Susana Adelina

doi:10.1016/j.apcata.2019.117235

Cited by 19 publications

(12 citation statements)

References 31 publications

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“…However, for Ni/CeO 2 , 33 the H atoms were fully abstracted by lattice oxygen from adsorbed methane until C* remained. A similar result was also found by Hu et al 34 Recently, He et al 35 discovered that the reaction pathway of methane combustion over an α-Fe 2 O 3 (110)…”

Section: Eley−rideal (E-r) Mechanismsupporting

confidence: 82%

“…108 Wang et al 109 discovered that the NiO nanoparticles doped by Zr contained more Ni 2+ species, which were active sites for methane combustion. Toscani et al 110 discovered that the introduction of Sc into CeO 2 -ZrO 2 catalysts demonstrated a significant increase in catalytic activity, which was due to the lattice defects and oxygen mobility. Qiao et al 111 found that the proper doping of Ca in the CuO-CeO 2 catalysts facilitated the catalytic performance of CuO-CeO 2 when its content was below 15 at.%.…”

Section: Additivesmentioning

confidence: 99%

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Catalytic Combustion of Methane: From Mechanism and Materials Properties to Catalytic Performance

et al. 2022

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Catalytic combustion of methane is a promising way of eliminating fugitive methane emissions to meet the rising requirement of the wide application of natural gas vehicles. The performance of catalysts for methane combustion has been found to be significantly affected by the variety of lattice defects, oxygen vacancies, and metal−support interactions which are connected with the category, morphology, and crystal type of both active components and supports. Choices of additives and preparation methods also play important roles in the catalytic combustion of methane. In this Review, we highlight the recent progress in the development and understanding of catalytic combustion of methane. Distinct mechanisms regarding catalytic combustion of methane, including the Langmuir−Hinshelwood mechanism, the Eley−Rideal mechanism, and the Mars−van Krevelen mechanism, are first discussed. The effects of active components, supports, additives, and preparation methods on the properties of catalysts for methane combustion are then analyzed. From a practical point of view, the effects of the components of exhaust gas, which include carbon dioxide, water, sulfur compounds, and nitrogencontaining compounds, are also discussed. Finally, we provide a summary regarding the current situation and future prospects for the catalytic combustion of methane.

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Section: Eley−rideal (E-r) Mechanismsupporting

confidence: 82%

Section: Additivesmentioning

confidence: 99%

Catalytic Combustion of Methane: From Mechanism and Materials Properties to Catalytic Performance

et al. 2022

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“…Doping of Ce-Zr mixed oxides with Sc in atomic content of 2%, 4% and 6%, respectively, has proved to be quite unsuccessful in obtaining a performing catalyst in methane combustion, even though the preparation through sol-gel citrate route afforded materials with good textural features (BET surface areas of 35-48 m 2 /g and crystallite size of around 10 nm) [176]. Although, the addition of Sc ions in the Ce-Zr lattice improved slightly the catalytic activity of Zr-doped ceria by increasing reducibility, unfortunately the Sc containing samples displayed still high light-off temperatures of~550 • C and T 50 values of 700 • C, as Sc is not active redox to bring more activity to mixed oxide systems.…”

Section: Bimetallic 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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“…Control tuning of oxygen vacancies in vacancy-rich oxides such as ceria can open up their applications in diverse selective oxidative reactions . The vacancies could be effectively tuned to tailored reactivity by a guest molecule that can preferentially target vacancies or via controlled reduction of the vacancy concentration – realization of a doping ceria support. − …”

Section: Catalyst Developmentmentioning

confidence: 99%

Active Components of Catalysts of Methane Conversion to Synthesis Gas: Brief Perspectives

Zagaynov

2021

Energy Fuels

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Methane transformation into more valuable products has attracted extensive attention. Synthesis gas is an important intermediate product in the chemical industry. Several syngas production methods are available, depending on the purpose of the industrial application. A major limitation of the processes is the rapid deactivation of the catalyst, which has been commonly attributed to the sintering of the active sites of catalyst and carbon formations on these sites, induced by methane decomposition and CO disproportionation. The catalyst consists of an active component and support. Ceria-based systems have been extensively employed as the support because of their unique redox properties and high oxygen storage capacity. The most promising approach is to design an excellent active site of the catalyst, based on noble or transition metals. A comparison of perspective active components, especially polymetallic components, is considered here.

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Methane catalytic combustion over CeO2-ZrO2-Sc2O3 mixed oxides

Cited by 19 publications

References 31 publications

Catalytic Combustion of Methane: From Mechanism and Materials Properties to Catalytic Performance

Catalytic Combustion of Methane: From Mechanism and Materials Properties to Catalytic Performance

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

Active Components of Catalysts of Methane Conversion to Synthesis Gas: Brief Perspectives

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