Calcium oxide as high temperature CO2 sorbent: Effect of textural properties

Abstract A series of CaO samples were prepared and tested as a sorbent for global-warming CO 2 gas by measuring their CO 2 capture capacities at 700 °C using a TGA unit. It is demonstrated that average pore size in CaO sorbents plays the governing role in deciding sorbent CO 2 capture capacity, and that average pore size overrides the contributions of surface areas or pore volume. Sufficiently large pores in a macro range were necessary in CaO to prevent pore-filling and plugging by the CaCO 3 produced during the carbonation process.