Efficient in-situ conversion of low-concentration carbon dioxide in coal-fired flue gas using silver nanoparticles in amino-functionalism poly-ionic liquids

The in-situ catalytic conversion of carbon dioxide (CO2) 2 ) in coal-fired flue gas into high-value chemical products offers a potentially efficient way to meet the "dual-carbon" targets, avoiding the energy-intensive processes associated with CO2 2 capture and transport. In this study, a type of POPs-n@Ag2O 2 O catalysts with synergistic triple catalytic function was prepared. The amino group enabled selective adsorption of CO2 2 from complex gas mixture, while the imidazole moiety and the nanoscale silver activated CO2 2 and reaction substrate. Among the prepared catalyst, the POP-6@Ag2O 2 O catalyst successfully achieved the conversion of CO2 2 (8 vol%) from coal combustion flue gas and phenylpropargylamide into oxazolidine-2,4-dione under mild reaction conditions, without any discernible impact from the coexistence of less than 428 mg/m3 3 SO2 2 and less than 221 mg/m3 3 NO2. 2 . Furthermore, the catalytic performance of POP-6@Ag2O 2 O did not decrease significantly and the microstructure remained intact after six cycles of use. The structure-activity relationship of POP-6@Ag2O 2 O demonstrated that insertion of amino groups into the catalyst can significantly increase the adsorption capacity of CO2, 2 , thus improving its conversion efficiency.