“…In another study, efforts were made to enhance the CO 2 capture performance of FA-stabilized CaO-based sorbents using either FA pretreated by grinding, calcination, and alkaline solution leaching or mixing CaO, FA, and basic/acidic solutions . The results showed that CaO combined with FA under acidic conditions (50% acetic acid solution) presented an increased reactivity and achieved high CO 2 capture capacity, which was attributed to the formation of Ca 12 Al 14 O 33 and CaSiO 3 , as well as a better microstructure. , Sreenivasulu et al , employed various combinations of sorbents based on CaO, MgO, zeolites (H-β and H-ZSM 5), and Al 2 O 3 in the presence or absence of FA for evaluating the CO 2 capture performance. They found that 50%CaO–10%MgO–40%FA exhibited the highest capture capacity and cyclic stability of up to 15 cycles …”