02257nas a2200265   4500008004100000022001400041245008600055210006900141260000900210490000700219520138700226653001601613653001501629653003901644653002001683653001201703100001701715700002201732700002901754700002201783700002501805700002601830700002001856856011501876       2025                        eng d  a1864-563100aIntegrated flue gas CO2 capture and conversion to formate: a sustainable approach0 aIntegrated flue gas CO2 capture and conversion to formate a sust  cDEC 0 v183 a<p>
	Industrial CO2 emissions, characterized by dilute streams and impurity complexity, demand energy-efficient mitigation strategies beyond conventional capture technologies. Here, an integrated CO2 capture and conversion (ICCC) system is reported employing a heterogenized iridium catalyst-hydroxyquinoline-ligated Cp*Ir-Cl immobilized on amine-functionalized silica-that directly converts CO2 from synthetic flue gas containing SOx, NOx, and O2 to formate with 100% selectivity. The catalyst delivers remarkable activity, achieving turnover numbers up to 10,286 within 16 h. Density functional theory reveals that its square pyramidal geometry, induced by the hydroxyquinoline ligand, enhances Ir-N(ring) bond strength and electronic delocalization, thereby improving hydration energy, structural robustness, and catalytic efficiency. Importantly, the catalyst system demonstrates excellent durability, maintaining full activity over five regeneration cycles. Hydrogenation in a 1 M DABCO medium, followed by thermal decomposition of the amine-formate adduct at 150 degrees C, enables efficient lean amine regeneration, allowing subsequent flue gas capture and formate production without performance loss. This closed-loop strategy delivers a sustainable, contaminant-tolerant, and recyclable CO2-to-formate platform with strong promise for scalable industrial deployment.</p>
10aCO2 capture10aflue gases10aintegrated capture and conversions10anet zero future10aRecycle1 aKumar, Rohit1 aMajumder, Supriyo1 aSingh, Chadrodai, Pratap1 aSamanta, Chanchal1 aNewalkar, Bharat, L.1 aKrishnamurty, Sailaja1 aDas, Raj, Kumar  uhttps://library.ncl.res.in/content/integrated-flue-gas-co2-capture-and-conversion-formate-sustainable-approach