Cyclic CO2 capture by limestone‐derived sorbent during prolonged calcination/carbonation cycling

The performance of limestone-derived CaO during many (>1000 in some cases) calcination and carbonation cycles is reported. After 150 cycles, the calcium utilization during carbonation reached a minimum value between 4 and 17%, with the asymptotic level depending strongly on the carbonation time. With the aid of mechanistic studies including investigations on sorbent surface topology by SEM and mercury intrusion, a mechanism for pore evolution during the cyclic capture is proposed consistent with the experimental observations. © 2008 American Institute of Chemical Engineers AIChE J, 2008

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