Abstract
Hydrocalumite ([Ca2Al(OH)6]2CO3·mH2O) was synthesized by precipitation and thermally activated at 300 and 550°C. Its CO2 chemisorption capacity was evaluated and compared with that of calcium oxide (CaO). Initial thermal analyses showed that CaAl-550 sample has better properties as CO2 sorbent than CaO, evaluated under similar conditions. It was determined that both materials (CaAl-550 and CaO) have similar kinetic behavior, and the presence of Ca12Al14O33 on the CaAl-550 sample did not reduce or interfere with the CO2 capture. Moreover, when the CO2 absorption-desorption cyclability was analyzed, the CaAl-550 sample apparently possessed better CO2 capture efficiency and thermal stability than CaO. In fact, different characterization analyses (nuclear magnetic resonance and scanning electron microscopy ) suggest that CO2 capture efficiency and thermal stability observed on the CaAl-550 sample can be attributed to the aluminum presence, as Ca12Al14O33.
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