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

Abstract A CaO sorbent with high reactivity for cyclic high temperature CO 2 capture was synthesized using a standard sol–gel process with citric acid as the chelation agent. The cyclic CO 2 capture performance of the new sorbent was compared with that of the sorbents derived from commercial micro- and nano-sized CaCO 3 . The new CaO sorbent achieved a high CO 2 capture capacity of 0.51 g CO 2 /g sorbent under mild calcination conditions and retained an acceptable CO 2 capture capacity of 0.20 g CO 2 /g sorbent under severe calcination conditions after 20 cycles, much higher than those of the sorbents derived from commercial CaCO 3 under the same reaction conditions. In addition, the new sorbent had a very rapid reaction rate at the initial reaction stage, achieving a calcium conversion ratio of 60% within 20 s. Microscopic images showed that well-dispersed particles with an average size of about 200 nm were formed within the sorbent. The new sorbent also had a better sintering-resistant property than the other sorbents tested during multiple calcination/carbonation cycles.

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