Oxidative coupling of methane in the redox cyclic mode over the catalysts on the basis of CeO2 and La2O3

Greish, A. A.; Глухов, Л. М.; Финашина, Е. Д.; Kustov, L. М.; Sung, Jae-Suk; Choo, Ko-Yeon; Kim, Tae‐Hwan

doi:10.1016/j.mencom.2010.01.011

Cited by 21 publications

(7 citation statements)

References 13 publications

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“…They proposed that there are two kinds of oxygen species on the oxide: (i) the active oxygen species (weakly bound oxygen species) which are responsible for complete oxidation of methane and (ii) the weaker oxygen species (strongly bound oxygen species) which are responsible for partial oxidation of methane to syngas. This is similar with the observation by Greish et al [57]. Methane reacts firstly with the active oxygen species to form CO 2 and H 2 O, and then the weaker oxygen species can oxidize methane to CO and H 2 with high selectivity.…”

Section: Perovskite Oxygen Carrierssupporting

confidence: 91%

Syngas Generation from Methane Using a Chemical-Looping Concept: A Review of Oxygen Carriers

Wang

Wei

2013

Journal of Chemistry

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Conversion of methane to syngas using a chemical-looping concept is a novel method for syngas generation. This process is based on the transfer of gaseous oxygen source to fuel (e.g., methane) by means of a cycling process using solid oxides as oxygen carriers to avoid direct contact between fuel and gaseous oxygen. Syngas is produced through the gas-solid reaction between methane and solid oxides (oxygen carriers), and then the reduced oxygen carriers can be regenerated by a gaseous oxidant, such as air or water. The oxygen carrier is recycled between the two steps, and the syngas with a ratio of H2/CO = 2.0 can be obtained successively. Air is used instead of pure oxygen allowing considerable cost savings, and the separation of fuel from the gaseous oxidant avoids the risk of explosion and the dilution of product gas with nitrogen. The design and elaboration of suitable oxygen carriers is a key issue to optimize this method. As one of the most interesting oxygen storage materials, ceria-based and perovskite oxides were paid much attention for this process. This paper briefly introduced the recent research progresses on the oxygen carriers used in the chemical-looping selective oxidation of methane (CLSOM) to syngas.

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Section: Perovskite Oxygen Carrierssupporting

confidence: 91%

Syngas Generation from Methane Using a Chemical-Looping Concept: A Review of Oxygen Carriers

Wang

Wei

2013

Journal of Chemistry

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“…If the oxygen diffusion rate is too slow, the oxygen in the bulk phase will have a minimal effect on the reaction. Various chemical composition and defective structures have been tested for their capacity to control the change in oxygen mobility, and hence, the reaction rate of the OCM reaction (Greish et al, 2010;Mestl et al, 2001;Sung et al, 2010). Chung et al investigated the performance of Manganese-based reducible metal oxides in the co-feed and the chemical looping schemes.…”

Section: Clocm Oxygen Carriersmentioning

confidence: 99%

Advances in Carbon Management Technologies

Sikdar¹,

Princiotta

2020

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“…Comparison of CLOCM systems on a C 2+ selectivity vs CH 4 conversion plot from the literature and this work. ,,,,− …”

Section: Introductionmentioning

confidence: 99%

Codoping Mg-Mn Based Oxygen Carrier with Lithium and Tungsten for Enhanced C₂ Yield in a Chemical Looping Oxidative Coupling of Methane System

Baser

Cheng

Fan

et al. 2021

ACS Sustainable Chem. Eng.

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Oxidative coupling of methane (OCM) is a compelling strategy for the direct conversion of methane to C2+ hydrocarbons in order to produce fuels and value-added chemicals. Nevertheless, it remains challenging to achieve the high C2+ yield that is desirable in industrial synthesis. Here, a lithium, tungsten-codoped Mg-Mn based oxygen carrier, (Li,W)-Mg6MnO8, is prepared for the chemical looping oxidative coupling of methane (CLOCM) technology. The designed codoped oxygen carrier exhibits an improved OCM performance with a C2+ yield of 28.6% at 850 °C, which is 80% higher than the combined yields of the single Li- and W-doped oxygen carriers, and 330% higher than that of the undoped Mg6MnO8 oxygen carrier. The enhanced activity has also been demonstrated over 50 redox cycles in the CLOCM system. In combination with solid characterization, density functional theory calculations reveal that, as compared to the single-metal-doped Mg6MnO8, the Li and W codopants work synergistically which not only enhances CH3 dimerization but also inhibits CO2 formation. This effect was attributed to the suppressed formation of unselective oxygen vacancies, which in turn leads to the C2+ yield enhancement. As a result, (Li,W)-Mg6MnO8 was found to be one of the best performing oxygen carriers as compared to other oxygen carriers reported in the literature. These findings provide new insights into the understanding of the codoping effect on the activity of a Mg-Mn based oxygen carrier for C2+ production and can open new avenues to design an environmentally and economically feasible CLOCM system.

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Oxidative coupling of methane in the redox cyclic mode over the catalysts on the basis of CeO2 and La2O3

Cited by 21 publications

References 13 publications

Syngas Generation from Methane Using a Chemical-Looping Concept: A Review of Oxygen Carriers

Syngas Generation from Methane Using a Chemical-Looping Concept: A Review of Oxygen Carriers

Advances in Carbon Management Technologies

Codoping Mg-Mn Based Oxygen Carrier with Lithium and Tungsten for Enhanced C₂ Yield in a Chemical Looping Oxidative Coupling of Methane System

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Oxidative coupling of methane in the redox cyclic mode over the catalysts on the basis of CeO2 and La2O3

Cited by 21 publications

References 13 publications

Syngas Generation from Methane Using a Chemical-Looping Concept: A Review of Oxygen Carriers

Syngas Generation from Methane Using a Chemical-Looping Concept: A Review of Oxygen Carriers

Advances in Carbon Management Technologies

Codoping Mg-Mn Based Oxygen Carrier with Lithium and Tungsten for Enhanced C2 Yield in a Chemical Looping Oxidative Coupling of Methane System

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Product

Resources

About

Codoping Mg-Mn Based Oxygen Carrier with Lithium and Tungsten for Enhanced C₂ Yield in a Chemical Looping Oxidative Coupling of Methane System