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Electrochemical conversion of methane to ethylene in a solid oxide electrolyzer.

ABSTRACT: Conversion of methane to ethylene with high yield remains a fundamental challenge due to the low ethylene selectivity, severe carbon deposition and instability of catalysts. Here we demonstrate a conceptually different process of in situ electrochemical oxidation of methane to ethylene in a solid oxide electrolyzer under ambient pressure at 850?°C. The porous electrode scaffold with an in situ-grown metal/oxide interface enhances coking resistance and catalyst stability at high temperatures. The highest C₂ product selectivity of 81.2% together with the highest C₂ product concentration of 16.7% in output gas (12.1% ethylene and 4.6% ethane) is achieved while the methane conversion reaches as high as 41% in the initial pass. This strategy provides an optimal performance with no obvious degradation being observed after 100?h of high temperature operation and 10 redox cycles, suggesting a reliable electrochemical process for conversion of methane into valuable chemicals.

SUBMITTER: Zhu C

PROVIDER: S-EPMC6414614 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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Electrochemical conversion of methane to ethylene in a solid oxide electrolyzer.

Zhu Changli C Hou Shisheng S Hu Xiuli X Lu Jinhai J Chen Fanglin F Xie Kui K

Nature communications 20190312 1

Conversion of methane to ethylene with high yield remains a fundamental challenge due to the low ethylene selectivity, severe carbon deposition and instability of catalysts. Here we demonstrate a conceptually different process of in situ electrochemical oxidation of methane to ethylene in a solid oxide electrolyzer under ambient pressure at 850 °C. The porous electrode scaffold with an in situ-grown metal/oxide interface enhances coking resistance and catalyst stability at high temperatures. The ...[more]

PMID: 30862779

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