Integrated CO₂ Capture and Conversion to Formate and Methanol: Connecting Two Threads.

Area of Science:

• Chemical Engineering
• Catalysis
• Environmental Science

Background:

• Rising atmospheric CO2 concentrations necessitate effective capture and utilization strategies.
• Carbon capture and utilization (CCU) aims to convert CO2 into valuable products like methanol and formic acid.
• Methanol and formic acid serve as efficient hydrogen carriers and fuel precursors.

Purpose of the Study:

• To review recent advances in integrated CO2 capture and hydrogenation processes.
• To explore the synthesis of formic acid and methanol from CO2 using homogeneous catalysts.
• To discuss the role of amine and hydroxide bases in facilitating CO2 capture and conversion.

Main Methods:

• Investigating combined CO2 capture using amine solutions and subsequent hydrogenation to formates.
• Examining methanol synthesis from captured CO2 using homogeneous catalysts and amine co-catalysts.
• Studying CO2 capture with hydroxide bases and conversion to formates, including regeneration in fuel cells.

Main Results:

• Amine basicity positively influences the reaction rate for formate salt formation.
• Effective catalyst and amine recycling strategies have been developed for methanol synthesis.
• Low-temperature regeneration of hydroxide bases in direct formate fuel cells is feasible.

Conclusions:

• Integrated CO2 capture and conversion processes offer an energy-efficient route to valuable chemicals.
• Homogeneous catalysis, aided by amine or hydroxide bases, shows promise for CO2 valorization.
• Further research is needed to develop integrated CO2 capture by hydroxides and methanol synthesis.