Synergistic reduction of pollution and carbon emissions is a critical pathway for achieving the deep purification of flue gases. Ce- and Cu-loaded porous carbons were synthesized, and the coadsorption capacity and adsorption mechanism of CO2, SO2, and NO were studied. At 25 °C and 1 bar, the adsorption capacities of Ce-loaded porous carbon are 3.42, 1.17, and 2.80 mmol/g for CO2, SO2, and NO, respectively. The presence of SO2 inhibits CO2 and NO adsorption, whereas CO2 promotes SO2 adsorption but suppresses NO adsorption in the multicomponent coadsorption process. Conversely, NO enhances SO2 adsorption while suppressing CO2 adsorption. The performance of Ce-loaded porous carbon significantly decreased during multicomponent adsorption, with NO and CO2 adsorption being notably suppressed, compared to separation adsorption. Mechanism studies revealed that CO2 adsorption primarily follows a physical process, whereas SO2 adsorption involves oxidation at metal active sites to form SO3, ultimately generating sulfates. NO adsorption occurs via oxygen-assisted chemisorption on metal sites, forming adsorbed NO* species that are further converted to NO2. These findings provide insights into the design of multifunctional adsorbents for synergistic air pollution and carbon control in flue gases.
Wu et al. (Fri,) studied this question.