Coffee grounds derived N enriched microporous activated carbons: Efficient adsorbent for post-combustion CO2 capture and conversion

N enriched microporous active carbons (CACs) were successfully obtained with coffee grounds as precursor and KOH as activator, which were used for the capture and conversion of CO2 from post-combustion. The influence of preparation parameters, such as the temperature of activation and KOH/carbon ratio on textural properties of CACs were studied. N-2 adsorption-desorption, XRD, Raman, SEM and XPS were used for characterization of the CACs. The adsorption capacities of CO2 CACs-2-800 are 6.22 mmol.g(-1) (1 bar) and 2.37 mmol.g(-1) (0.15 bar) at 273 K. CACs-2-800 also have high selectivity of CO2/N-2 (S-CO2/ N2 = 33) and good adsorption-desorption recycle stability. Furthermore, the CACs-2-800 showed high catalytic activity for the cycloaddition of CO2 to epichlorohydrin. The good CO2 adsorption capacity, selectivity and catalytic performance indicated that CACs-2-800 could be used for the capture and conversion of CO2 from post-combustion. (C) 2020 Published by Elsevier Inc.