Biomass-derived carbon/MgO-Al2O3 composite with superior dynamic CO2 uptake for post combustion capture application

In this work, the biomass-derived activated carbon (AC)/MgO-Al2O3 composite with high-efficiency dynamic carbon dioxide (CO2) capture performance was prepared. The effects of MgO loading ratio, calcination temperature, calcination time, and magnesium source on the CO2 uptake of AC-based composites were studied. Moreover, the CO2 uptake of AC-based composites loaded with single metal MgO and loaded with bimetal MgO-Al2O3 were compared, and the cyclic stability of AC-based composites under different desorption temperatures was compared. In addition, the pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetic fitting analysis of the CO2 uptake at different adsorption temperatures were carried out. Finally, the AC-based composites were thoroughly characterized by BET, SEM, EDX, FT-IR and XRD. The most optimal AC-based composite with bimetal MgO-Al2O3 shows the maximum dynamic CO2 uptake of 4.50 mmol g(-1), which is comparable to the static CO2 capture performance in the previous report. It suggested that biomass-derived carbon/MgO-Al2O3 composite has high potential application value in the development of CO2 adsorption materials.