fig6

Figure 6. (A) IAST prediction of CO₂/N₂ (15/85, v/v) selectivities on Fe-MOR-CFA zeolite and Fe-MOR-ACH zeolite at 273 and 298 K; (B) Isosteric heats (Q_st) as a function of CO₂ uptakes on Fe-MOR-CFA zeolite and Fe-MOR-ACH zeolite; (C) CO₂ adsorption isotherms of Fe-MOR-CFA zeolite for ten times at 298 K; (D) Experimental column breakthrough curves for CO₂/N₂ (15/85, v/v) separations on Fe-MOR-CFA zeolite and Fe-MOR-ACH zeolite at 298 K. IAST: Ideal adsorbed solution theory; Fe-MOR-CFA: Fe-containing mordenite zeolite from coal fly ash; Fe-MOR-ACH: Fe-containing mordenite from acidic co-hydrolysis route.