As the main greenhouse gas, CO2 is also an abundant renewable carbon resource. CO2 functional reduction can convert CO2 into value-added chemicals by constructing C-C, C-O, C-N bonds. Efficient synthesis of formamides from CO2, H2 and amines have been reported extensively in the literature, however, pure or high pressure CO2 is required, implying that the CO2 from the atmosphere or industrial exhaust cannot be used as C1 source directly and thus the energy issue in CO2 capture and separation persists. We used morpholine as both CO2 capture reagent and formylation reagent in this study to produce value-added N-formylmorpholine under relatively mild reaction conditions. Morpholine can efficiently capture CO2 in air and further hydrogenated to formamides over isolated Ir/ND@G catalysts with a TON of up to 817,000, and the captured CO2 consumption rate reached 3.15 molCO2●molIr-1●s-1.

Integrative CO2 capture and morpholine formylation on supported iridium catalyst

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