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Hydroxide Based Integrated CO2 Capture from Air and Conversion to Methanol.

Raktim Sen1, Alain Goeppert1, Sayan Kar1

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Alkali hydroxide systems efficiently capture carbon dioxide (CO2) and convert it to methanol using ethylene glycol solutions and ruthenium catalysts. This novel method offers a stable, scalable alternative for direct air capture and methanol production.

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Area of Science:

  • Chemical Engineering
  • Catalysis
  • Carbon Capture and Utilization

Background:

  • Traditional amine-based systems for carbon dioxide (CO2) capture face challenges in stability and scalability.
  • Developing efficient methods for CO2 conversion to valuable products like methanol is crucial for sustainable chemical processes.

Purpose of the Study:

  • To establish the first alkali hydroxide-based system for simultaneous CO2 capture and conversion to methanol.
  • To investigate the efficiency and scalability of this new process, including base regeneration and direct air capture.

Main Methods:

  • Utilizing an ethylene glycol solution of alkali hydroxide for CO2 capture.
  • Employing ruthenium-tetraphosphorus (Ru-PNP) catalysts for the hydrogenation of captured CO2 (as bicarbonate and formate salts) to methanol (CH3OH).
  • Operating the integrated one-pot system at mild temperatures (100-140 °C) with subsequent methanol separation by distillation.

Main Results:

  • Achieved high yields in the hydrogenation of bicarbonate and formate salts to methanol.
  • Demonstrated efficient CO2 capture from ambient air and subsequent hydrogenation to methanol.
  • Observed low-temperature regeneration of the hydroxide base for the first time, indicating process sustainability.

Conclusions:

  • Alkali hydroxide-based systems present a superior alternative to amine-based routes for direct air capture and methanol conversion due to high capture efficiency and stability.
  • The developed one-pot system is potentially scalable for industrial applications in carbon capture and utilization.