Nanosheet MgO-Based CO2 Sorbent Promoted by Mixed-Alkali-Metal Nitrate and Carbonate: Performance and Mechanism

A series of nanosheet MgO-based sorbents promoted by mixed-alkali-metal nitrate and carbonate were prepared by a simple precipitation–deposition method and applied to CO 2 capture. The structural properties of these sorbents were characterized by various techniques, and their CO 2 capture performance was evaluated using a thermogravimetric analyzer. Compared to the sorbent derived from commercial MgO, the nanosheet MgO-based sorbent had faster and higher CO 2 uptake, because of its thin-sheet structure. Among various alkali-metal-salt-promoted nanosheet MgO, the sorbents promoted with mixed-alkali-metal nitrates (LiNO 3 and KNO 3 ) and carbonates (Na 2 CO 3 and K 2 CO 3 ) exhibited a high total CO 2 uptake at a respectable rate. In particular, the sorbent with a MgO content of 73 wt % and a nitrate/carbonate molar ratio of 2 possessed the highest total CO 2 uptake and the best cyclic stability, with a total uptake of 0.52 g CO 2 /g sorbent and MgO conversion of 65% after 20 cycles (60 min of absorption in 40% CO 2 /60% N 2 at 350 °C, 15 min of regeneration in 100% N 2 at 400 °C). Based on the structure–activity relationship of the sorbents, a possible mechanism consisting of three stages was presented for the CO 2 absorption process, in which the dissolution of CO 2 and carbonation in the molten nitrate played an important role.