Characterization and stability of a new, high-capacity amine-functionalized CO2 sorbent

• A solid, amine-based CO2 sorbent named RFAS is characterized for stability.
• RFAS maintains a high capacity for CO2 over 10 adsorption/desorption cycles.
• The stability of RFAS over 10 cycles is verified using FTIR, XRD, XPS, and 13C NMR.

Solid sorbents have received extensive research as an alternative to aqueous amine scrubbing to remove CO2 from gas streams due to their theoretically lower energy requirements. Amine-functionalized sorbents are among the solid sorbents with the highest CO2 capacity. In this study, a recently developed amine-functionalized sorbent with a high capacity for CO2 is characterized using multiple techniques, including 13C NMR. These characterizations show that the sorbent is thermally stable up to 200 °C and is stable when used up to ten sorption–desorption cycles.