An all-aqueous and phosphine-free integrated amine-assisted CO2 capture and catalytic conversion to formic acid

A phosphine-free Ir(iii)-NHC-based efficient catalytic system is developed for integrated CO2 capture with tetramethylguanidine as a capturing agent and conversion to formate with H-2 gas, conducting both the steps in water, affording product yield up to 85% and TON up to 19 171 in just 12 h. In the segment of integrated CO2-capture and conversion to formate, this system represents not only the first phosphine-free module, but also one of the few best known homogeneous catalysts.

Automated summary

A phosphine-free Ir(iii)-NHC-based catalytic system has been developed for integrated CO2 capture and conversion to formate, achieving high yields and TON in just 12 hours.