CO2 uptake of modified calcium-based sorbents in a pressurized carbonation–calcination looping

Abstract This study focuses on enhancing CO 2 uptake by modifying limestone with acetate solutions under pressurized carbonation condition. The multicycle tests were carried out in an atmospheric calcination/pressurized carbonation reactor system at different temperatures and pressures. The pore structure characteristics (BET and BJH) were measured as a supplement to the reaction studies. Compared with the raw limestone, the modified sorbent showed a great improvement in CO 2 uptake at the same reaction condition. The highest CO 2 uptake was obtained at 700 °C and 0.5 MPa, by 88.5% increase over the limestone at 0.1 MPa after 10 cycles. The structure characteristics of the sorbents on N 2 absorption and SEM confirm that compared with the modified sorbent, the effective pores of limestone are greatly driven off by sintering, which hinders the easy access of CO 2 molecules to the unreacted-active sites of CaO. The morphological and structural properties of the modified sorbent did not reveal significant differences after multiple cycles. This would explain its superior performance of CO 2 uptake under pressurized carbonation. Even after 10 cycles, the modified sorbent still achieved a CO 2 uptake of 0.88.

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