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<p>Current ethylene glycol (EG) production generates 46 million metric tons of CO<sub>2</sub> equiv. emission annually. While electrified synthesis could decarbonize this process, existing ethylene oxidation systems suffer from high energy consumption resulting from excessive voltages. Here we identify, with the aid of in situ photoluminescence spectroscopy, an increased pH at the membrane–anode interface within a membrane–electrode assembly electrolyser and find that it arises due to hydroxide counter-migration across the membrane. To address this challenge, we integrate cathodic electrochemical carbon capture to reduce hydroxide flux and develop RuSnO<sub><i>x</i></sub> catalysts that favour *Cl over *OH adsorption, facilitating chloride-mediated ethylene oxidation. The system achieves 94% Faradaic efficiency for ethylene-to-EG conversion and 91% CO<sub>2</sub> capture efficiency from a 10% CO<sub>2</sub> stream, sequestering 0.60 tonnes CO<sub>2</sub> per tonne of EG produced from ethylene. This approach results in an estimated carbon intensity of 0.133 tonnes CO<sub>2</sub> equiv. per tonne EG, compared with the global average of 1.2 tonnes CO<sub>2</sub> equiv. per tonne EG.</p><p></p>

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Electrosynthesis of ethylene glycol from ethylene coupled with CO2 capture

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Rong Xia,
  • Yiqing Chen,
  • Yuxin Chang,
  • Heejong Shin,
  • Huajie Ze,
  • Hengzhou Liu,
  • Pengfei Ou,
  • Roham Dorakhan,
  • Sungjin Park,
  • Panos Papangelakis,
  • Zunmin Guo,
  • Eduardo G. Machado,
  • Marcio V. Reboucas,
  • Mohsen Nikkhoo,
  • Ricardo G. A. Duarte,
  • Daojin Zhou,
  • Yuan Liu,
  • Weiyan Ni,
  • Cong Tian,
  • Yuanjun Chen,
  • Christine Yu,
  • Omar K. Farha,
  • Ke Xie,
  • Edward H. Sargent

摘要

Current ethylene glycol (EG) production generates 46 million metric tons of CO2 equiv. emission annually. While electrified synthesis could decarbonize this process, existing ethylene oxidation systems suffer from high energy consumption resulting from excessive voltages. Here we identify, with the aid of in situ photoluminescence spectroscopy, an increased pH at the membrane–anode interface within a membrane–electrode assembly electrolyser and find that it arises due to hydroxide counter-migration across the membrane. To address this challenge, we integrate cathodic electrochemical carbon capture to reduce hydroxide flux and develop RuSnOx catalysts that favour *Cl over *OH adsorption, facilitating chloride-mediated ethylene oxidation. The system achieves 94% Faradaic efficiency for ethylene-to-EG conversion and 91% CO2 capture efficiency from a 10% CO2 stream, sequestering 0.60 tonnes CO2 per tonne of EG produced from ethylene. This approach results in an estimated carbon intensity of 0.133 tonnes CO2 equiv. per tonne EG, compared with the global average of 1.2 tonnes CO2 equiv. per tonne EG.