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Catalysts 2019, 9(4), 363; https://doi.org/10.3390/catal9040363

Oxidative Coupling of Methane over Mn2O3-Na2WO4/SiC Catalysts

1
Institute of NT-IT Fusion Technology, Ajou University206, World cup-ro, Yeongtong-Gu, Suwon 16499, Korea
2
Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea
3
Green School (Graduate School of Energy and Environment), Korea University, Seoul 02841, Korea
4
Division of Energy & Environment Technology KIST School, Korea University of Science and Technology, Seoul 02792, Korea
5
Department of Energy Systems Research, Ajou University 206, World cup-ro, Yeongtong-Gu, Suwon 16499, Korea
6
Department of Chemical Engineering, Ajou University 206, World cup-ro, Yeongtong-Gu, Suwon 16499, Korea
*
Author to whom correspondence should be addressed.
Received: 27 March 2019 / Revised: 10 April 2019 / Accepted: 11 April 2019 / Published: 15 April 2019
(This article belongs to the Special Issue Catalysts for Stable Molecules (CO2, CO, CH4, NH3) Conversion)
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Abstract

The oxidative coupling of methane (OCM) is operated at high temperatures and is a highly exothermic reaction; thus, hotspots form on the catalyst surface during reaction unless the produced heat is removed. It is crucial to control the heat formed because surface hotspots can degrade catalytic performance. Herein, we report the preparation of Mn2O3-Na2WO4/SiC catalysts using SiC, which has high thermal conductivity and good stability at high temperatures, and the catalyst was applied to the OCM. Two Mn2O3-Na2WO4/SiC catalysts were prepared by wet-impregnation on SiC supports having different particle sizes. For comparison, the Mn2O3-Na2WO4/SiO2 catalyst was also prepared by the same method. The catalysts were analyzed by nitrogen adsorption–desorption, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The transformation of SiC into α-cristobalite was observed for the Mn2O3-Na2WO4/SiC catalysts. Because SiC was completely converted into α-cristobalite for the nano-sized SiC-supported Mn2O3-Na2WO4 catalyst, the catalytic performance for the OCM reaction of Mn2O3-Na2WO4/n-SiC was similar to that of Mn2O3-Na2WO4/SiO2. However, only the surface layer of SiC was transformed into α-cristobalite for the micro-sized SiC (m-SiC) in Mn2O3-Na2WO4/m-SiC, resulting in a [email protected]α-cristobalite core–shell structure. The Mn2O3-Na2WO4/m-SiC showed higher methane conversion and C2+ yield at 800 and 850 °C than Mn2O3-Na2WO4/SiO2. View Full-Text
Keywords: oxidative coupling of methane; Mn2O3-Na2WO4/SiC; thermal conductive material; silicon carbide oxidative coupling of methane; Mn2O3-Na2WO4/SiC; thermal conductive material; silicon carbide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kim, J.; Park, L.-H.; Ha, J.-M.; Park, E.D. Oxidative Coupling of Methane over Mn2O3-Na2WO4/SiC Catalysts. Catalysts 2019, 9, 363.

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