CO2 Separation-Adsorption until Efficient Reduction Based Porous Multinuclear Clusters Metal−organic Frameworks

The excessive existence of CO 2 in the atmosphere has caused serious environmental problems. Therefore, how to capture, selectively adsorb, and the effective utilization of CO 2 into useful chemicals has attracted widespread attention. In particular, the exploration of combining CO 2 capture with conversion has rarely been reported. Herein, two isometric metal-organic frameworks (MOFs) Cd 3 (ntba) 2 -(2,2′-bipy) 2 ] n (MOF1), and Co 3 (ntba) 2 (2,2′-bipy) 2 ] n (MOF2) were successfully obtained. Under normal temperature and pressure conditions, based on the ideal specific surface area porosity, MOF1 and MOF2 exhibit super adsorption and separation ability for CO 2 . The maximum adsorption capacity and separation ratio are 54.3 cm 3 g -1 (MOF1), 64.2 cm 3 g -1 (MOF2), and 16.9 (MOF1, CO 2 /CH 4 ), 192.7 (MOF1, CO 2 /N 2 ), 117.8 (MOF1, CO 2 /O 2 ), 22.6 (MOF2, CO 2 /CH 4 ), 130.3 (MOF2, CO 2 /N 2 ), 59.1 (MOF2, CO 2 /O 2 ), respectively. Under optimal reaction conditions, the MOF1 and MOF2 as catalysts demonstrate outstanding efficiency and reaction selectivity in catalyzing cycloaddition conversion reaction of CO 2 , achieving yields of 96% and 93%, respectively. The catalytic reaction produced useful chemical products via a novel method integrating CO 2 capture and conversion, eliminating the economic costs associated with CO₂ purification and enabling the economical utilization of CO₂ . Thus, this work presents a novel strategy for the CO 2 utilization in mixed gases and can also provide valuable references for related research.