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      Synthesis of Value-Added Chemicals via Oxidative Coupling of Methanes over Na 2WO 4–TiO 2–MnO x /SiO 2 Catalysts with Alkali or Alkali Earth Oxide Additives

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          Abstract

          Na 2WO 4–TiO 2–MnO x /SiO 2 (SM) catalysts with alkali (Li, K, Rb, Cs) or alkali earth (Mg, Ca, Sr, Ba) oxide additives, which were prepared using incipient wetness impregnation, were investigated for oxidative coupling of methane (OCM) to value-added hydrocarbons (C 2+). A screening test that was performed on the catalysts revealed that SM with Sr (SM–Sr) had the highest yield of C 2+. X-ray photoelectron spectroscopy analyses indicated that the catalysts with a relatively low binding energy of W 4f 7/2 facilitated a high CH 4 conversion. A combination of crystalline MnTiO 3, Mn 2O 3, α-cristobalite, Na 2WO 4, and TiO 2 phases was identified as an essential component for a remarkable improvement in the activity of the catalysts in the OCM reaction. In attempts to optimize the C 2+ yield, 0.25 wt % Sr onto SM–Sr achieved the highest C 2+ yield at 22.9% with a 62.5% C 2+ selectivity and a 36.6% CH 4 conversion. A stability test of the optimal catalyst showed that after 24 h of testing, its activity decreased by 18.7%.

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          Most cited references 65

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          Oxidative dimerization of methane over a lithium-promoted magnesium oxide catalyst

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            Synthesis of ethylene via oxidative coupling of methane I. Determination of active catalysts

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              Formation of gas-phase methyl radicals over magnesium oxide

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                Author and article information

                Journal
                ACS Omega
                ACS Omega
                ao
                acsodf
                ACS Omega
                American Chemical Society
                2470-1343
                05 June 2020
                16 June 2020
                : 5
                : 23
                : 13612-13620
                Affiliations
                []Department of Chemical Engineering, Faculty of Engineering, Kasetsart University , Bangkok 10900, Thailand
                []Center of Excellence on Petrochemical and Materials Technology, Kasetsart University , Bangkok 10900, Thailand
                [§ ]Research Network of NANOTEC−KU on NanoCatalysts and NanoMaterials for Sustainable Energy and Environment, Kasetsart University , Bangkok 10900, Thailand
                []Department of Chemical Engineering, Kwangwoon University , 20 Kwangwoon-Ro, Nowon-Gu, Seoul 01897, Korea
                Author notes
                Article
                10.1021/acsomega.0c00537
                7301378
                Copyright © 2020 American Chemical Society

                This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.

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