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<p>Direct air capture is an emerging technology to decrease atmospheric CO<sub>2</sub> levels, but it is currently costly and the long-term consequences of CO<sub>2</sub> storage are uncertain. An alternative approach is to utilize atmospheric CO<sub>2</sub> on-site to produce value-added renewable fuels, but current CO<sub>2</sub> utilization technologies predominantly require a concentrated CO<sub>2</sub> feed or high temperature. Here we report a gas-phase dual-bed direct air carbon capture and utilization flow reactor that produces syngas (CO + H<sub>2</sub>) through on-site utilization of air-captured CO<sub>2</sub> using light without requiring high temperature or pressure. The reactor consists of a bed of solid silica-amine adsorbent to capture aerobic CO<sub>2</sub> and produce CO<sub>2</sub>-free air; concentrated light is used to release the captured CO<sub>2</sub> and convert it to syngas over a bed of a silica/alumina-titania-cobalt bis(terpyridine) molecular–semiconductor photocatalyst. We use the oxidation of depolymerized poly(ethylene terephthalate) plastics as the counter-reaction. We envision this technology to operate in a diurnal fashion where CO<sub>2</sub> is captured during night-time and converted to syngas under concentrated sunlight during the day.</p>

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Direct air capture of CO2 for solar fuel production in flow

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年2月13日

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  • Sayan Kar,
  • Dongseok Kim,
  • Ariffin Bin Mohamad Annuar,
  • Bidyut Bikash Sarma,
  • Michael Stanton,
  • Erwin Lam,
  • Subhajit Bhattacharjee,
  • Suvendu Karak,
  • Heather F. Greer,
  • Erwin Reisner

摘要

Direct air capture is an emerging technology to decrease atmospheric CO2 levels, but it is currently costly and the long-term consequences of CO2 storage are uncertain. An alternative approach is to utilize atmospheric CO2 on-site to produce value-added renewable fuels, but current CO2 utilization technologies predominantly require a concentrated CO2 feed or high temperature. Here we report a gas-phase dual-bed direct air carbon capture and utilization flow reactor that produces syngas (CO + H2) through on-site utilization of air-captured CO2 using light without requiring high temperature or pressure. The reactor consists of a bed of solid silica-amine adsorbent to capture aerobic CO2 and produce CO2-free air; concentrated light is used to release the captured CO2 and convert it to syngas over a bed of a silica/alumina-titania-cobalt bis(terpyridine) molecular–semiconductor photocatalyst. We use the oxidation of depolymerized poly(ethylene terephthalate) plastics as the counter-reaction. We envision this technology to operate in a diurnal fashion where CO2 is captured during night-time and converted to syngas under concentrated sunlight during the day.