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Electrochemical Oxidative Dehydrogenation of Ethane to Ethylene in a Solid Oxide Electrolyzer
Angewandte Chemie International Edition ( IF 16.6 ) Pub Date : 2021-08-04 , DOI: 10.1002/anie.202109355
Lingting Ye 1 , Xiuyun Duan 1 , Kui Xie 1, 2, 3, 4
Affiliation  

Oxidative dehydrogenation of ethane to ethylene is an important process in light olefin industry; however, the over-oxidation of ethane leads to low ethylene selectivity. Here, we report a novel approach to electrochemical oxidative dehydrogenation of ethane in anode in conjunction with CO2 reduction at cathode in a solid oxide electrolyser using a porous single-crystalline CeO2 electrode at 600 °C. We identify and engineer the flux and chemical states of active oxygen species that evolve from the lattice at anode surface to activate and dehydrogenate ethane to ethylene via the reaction of epoxy species. Active oxygen species (O2−, O22− and O2) at the anode surface effectively dehydrogenate ethane to ethylene, but O species tend to induce deep oxidation. We demonstrate exceptionally high ethylene selectivity of 95 % and an ethane conversion of 10 % with a durable operation of 300 h.

中文翻译:

固体氧化物电解槽中乙烷电化学氧化脱氢制乙烯

乙烷氧化脱氢制乙烯是轻烯烃工业的重要工艺;然而,乙烷的过度氧化导致乙烯选择性低。在这里,我们报告了一种在 600°C 下使用多孔单晶 CeO 2电极在固体氧化物电解槽中将阳极电化学氧化脱氢与阴极CO 2还原相结合的新方法。我们确定并设计了活性氧物质的通量和化学状态,这些物质从阳极表面的晶格中演化出来,通过环氧物质的反应将乙烷活化和脱氢为乙烯。活性氧(O 2-、O 2 2-和O 2 -) 在阳极表面有效地将乙烷脱氢成乙烯,但 O -物种倾向于引起深度氧化。我们展示了 95% 的超高乙烯选择性和 10% 的乙烷转化率以及 300 小时的持久操作。
更新日期:2021-09-20
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