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

• Published in: Journal of colloid and interface science 2020-10, Vol.578, p.491-499
• Main Authors: Wang, Hefang, Li, Xuehan, Cui, Zhongyu, Fu, Zerui, Yang, Lijia, Liu, Guanghui, Li, Manhua
• Format: Article
• Language: English
• Subjects: Adsorbent; CO2 capture; Coffee grounds; Conversion; Microporous activated carbons
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2020.05.125

[Display omitted] 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. N2 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/N2 (SCO2/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.