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This work demonstrates the first-ever completely metal-free approach to the capture of CO 2 from air followed by reduction to methoxyborane (which produces methanol on hydrolysis) or sodium formate (which produces formic acid on hydrolysis) under ambient conditions. This was accomplished using an abnormal N-heterocyclic carbene ( a NHC)-borane adduct. The intermediate involved in CO 2 capture ( a NHC-H, HCOO, B(OH) 3 ) was structurally characterized by single-crystal X-ray diffraction. Interestingly, the captured CO 2 can be released by heating the intermediate, or by passing this compound through an ion-exchange resin. The capture of CO 2 from air can even proceed in the solid state via the formation of a bicarbonate complex ( a NHC-H, HCO 3 , B(OH) 3 ), which was also structurally characterized. A detailed mechanism for this process is proposed based on tandem density functional theory calculations and experiments.

Transforming atmospheric CO2 into alternative fuels: a metal-free approach under ambient conditions

Transforming atmospheric CO₂ into alternative fuels: a metal-free approach under ambient conditions