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<p>Sulfur dioxide (SO<sub>2</sub>) is a widespread industrial pollutant from fossil fuel combustion and metal smelting that causes serious environmental and health concerns. Converting SO<sub>2</sub> into valuable chemicals provides a sustainable solution for emission mitigation and resource use. Here we show a paired electrolysis strategy that directly transforms SO<sub>2</sub> into cyclic sulfite esters—high-value organosulfur intermediates widely used in organic synthesis and as precursors for functional materials—under mild conditions. SO<sub>2</sub> is reduced at the cathode to elemental sulfur, which then undergoes anodic oxidation and couples with alcohols to form five-membered, six-membered and seven-membered cyclic sulfite esters. Mechanistic studies reveal key sulfur-containing intermediates and elucidate the critical redox pathways. This method efficiently converts even low concentrations of SO<sub>2</sub>, including simulated industrial flue gas, demonstrating practical applicability. The strategy provides a versatile and environmentally friendly platform for green organosulfur synthesis and pollutant valorization, opening new avenues for sustainable chemical manufacturing.</p><p></p>

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Parallel paired electrolysis of industrial exhaust SO2 and diols for value-added sulfite esters synthesis

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Jingcheng Hu,
  • Jiayu Hu,
  • Yatao Wang,
  • Chen Zeng,
  • Heng Zhang,
  • Zhenwei Wei,
  • Wu Li,
  • Hong Yi,
  • Aiwen Lei

摘要

Sulfur dioxide (SO2) is a widespread industrial pollutant from fossil fuel combustion and metal smelting that causes serious environmental and health concerns. Converting SO2 into valuable chemicals provides a sustainable solution for emission mitigation and resource use. Here we show a paired electrolysis strategy that directly transforms SO2 into cyclic sulfite esters—high-value organosulfur intermediates widely used in organic synthesis and as precursors for functional materials—under mild conditions. SO2 is reduced at the cathode to elemental sulfur, which then undergoes anodic oxidation and couples with alcohols to form five-membered, six-membered and seven-membered cyclic sulfite esters. Mechanistic studies reveal key sulfur-containing intermediates and elucidate the critical redox pathways. This method efficiently converts even low concentrations of SO2, including simulated industrial flue gas, demonstrating practical applicability. The strategy provides a versatile and environmentally friendly platform for green organosulfur synthesis and pollutant valorization, opening new avenues for sustainable chemical manufacturing.