Peculiarities of oxidative coupling of methane in redox cyclic mode over Ag–La2O3/SiO2 catalysts

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

doi:10.1016/j.apcata.2010.03.015

Cited by 30 publications

(13 citation statements)

References 14 publications

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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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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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“…25−28 The higher C 2 yields are typically obtained from a highly dilute methane feed or an expensive COC composition. 26 At the commercial-scale, the addition of a diluent gas may not be practical as it imposes both an energy and capital cost for separations from an already dilute product stream while an expensive COC will increase operating costs. 29 A commercially suitable COC has three major desirable characteristics.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In redox OCM, C 2 yields between 20% and 30% have been obtained. Figure shows a summary of redox OCM results. − The higher C 2 yields are typically obtained from a highly dilute methane feed or an expensive COC composition . At the commercial-scale, the addition of a diluent gas may not be practical as it imposes both an energy and capital cost for separations from an already dilute product stream while an expensive COC will increase operating costs…”

Section: Introductionmentioning

confidence: 99%

Catalytic Oxygen Carriers and Process Systems for Oxidative Coupling of Methane Using the Chemical Looping Technology

Chung

Wang

Nadgouda

et al. 2016

Ind. Eng. Chem. Res.

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Directly upgrading natural gas is limited by the stability of its primary component, methane, and process economics. Since the 1980s, oxidative coupling of methane (OCM) has shown potential to produce ethylene and ethane (C2s). The typical OCM approach catalytically converts methane to C2 products using molecular oxygen, reducing process efficiency. To overcome this, chemical looping OCM converts methane to hydrocarbons via intermediate oxygen carriers rather than gaseous cofed oxidants. The chemical looping approach for OCM has been studied mechanistically for the first time with a Mn–Mg-based catalytic oxygen carrier (COC). The COC delivered stable performance in a fixed bed for 100 cycles for more than 50 h with a 63.2% C2 selectivity and 23.2% yield. These experimental results and original process simulations of an OCM chemical looping system for C2 or liquid fuel production with electricity cogeneration present a direct method for methane utilization.

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Peculiarities of oxidative coupling of methane in redox cyclic mode over Ag–La2O3/SiO2 catalysts

Cited by 30 publications

References 14 publications

Advances in Carbon Management Technologies

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

Catalytic Oxygen Carriers and Process Systems for Oxidative Coupling of Methane Using the Chemical Looping Technology

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Peculiarities of oxidative coupling of methane in redox cyclic mode over Ag–La2O3/SiO2 catalysts

Cited by 30 publications

References 14 publications

Advances in Carbon Management Technologies

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

Catalytic Oxygen Carriers and Process Systems for Oxidative Coupling of Methane Using the Chemical Looping Technology

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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