Abstract
Experiments were performed on calcium oxide, using water vapor with N2 or CO2 as carrier gases, between 40 and 70 °C. A initial experiment was performed with water vapor in the presence of N2 to elucidate the possible hydroxylation process produced by water vapor exclusively. On the other hand, when CO2 was used as carrier gas the CaO reactivity changed, producing different hydrated, hydroxylated, and carbonated phases. On the basis of these results and the fact that under dry conditions CO2 is not absorbed on CaO at T < 70 °C, a possible CaO–H2O–CO2 reaction mechanism was proposed, where CaO superficial hydroxylation process seems to play a very important role during the CO2 capture. Finally, a kinetic analysis was produced to compare the temperature and humidity relative influence on the whole process.
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Acknowledgements
This study was financially supported by the project SENER-CONACYT 150358. Authors thank A. Tejeda and M. A. Canseco for technical help.
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Sánchez-Rueda, A., Pfeiffer, H. Thermogravimetric analysis of the water vapor addition during the CaO carbonation process at moderate temperatures (40–70 °C). J Therm Anal Calorim 111, 1385–1390 (2013). https://doi.org/10.1007/s10973-012-2477-1
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DOI: https://doi.org/10.1007/s10973-012-2477-1