Adsorption of CO2, CO, H2, and N2 on Zeolites, Activated Carbons, and Metal-Organic Frameworks with Different Surface Nonuniformities

The single-component adsorption of CO2, CO, N2, and H2 at 25 35 °C was studied using microporous faujasite-framework zeolites (NaY NaX), activated carbons (GCN MSP), metal–organic frameworks (A100 Z1200) as starting points for the separation CO2 from syngases produced by gasifying biomass-based solid wastes. indicated isotherms uptake adsorbates strongly depended on themselves well adsorbents because significant differences in surface features, such nonuniformity, molecular properties. selectivity to other gases also varied with due distinctive energetic characteristics. surfaces were most energetically heterogeneous ones, yielding higher low pressures, while two A100 had moderate heterogeneities, MSP showed highest high 6 bar, which micropore volume area are important. Z1200, has highly homogeneous no high-affinity-binding sites, exhibited lowest capacity regardless equilibrated pressure. nonuniformities six sorbents consistent calculated isosteric heats adsorption. could be reversibly adsorbed NaY but not GCN, some metal impurities, although all these a fully reversible process CO estimated working 0.78–6.50 mmol/g, depending used. value disclosed MSP, heterogeneity between that Z1200. Such bodes use our later applications.