Manufacture of calcium-based sorbents for high temperature cyclic CO2 capture via a sol-gel process

► A sol-gel process can be used to manufacture calcium-based sorbents with high reactivity. ► Preparation conditions of sol-gel process had great effects on the performance of calcium-based sorbents. ► The new sorbent was composed of well-dispersed particles with an average size of about 200 nm. ► The new sorbent had a better sintering-resistant property during cyclic high temperature reactions than micro-and nano-sized CaCO3.