Thermochemical and Cyclability Analyses of the Absorption Process on a Ca/Al Layered Double Hydroxide
Publication: Journal of Environmental Engineering
Volume 137, Issue 11
Abstract
Hydrocalumite () was synthesized by precipitation and thermally activated at 300 and 550°C. Its chemisorption capacity was evaluated and compared with that of calcium oxide (CaO). Initial thermal analyses showed that CaAl-550 sample has better properties as 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 on the CaAl-550 sample did not reduce or interfere with the capture. Moreover, when the absorption-desorption cyclability was analyzed, the CaAl-550 sample apparently possessed better capture efficiency and thermal stability than CaO. In fact, different characterization analyses (nuclear magnetic resonance and scanning electron microscopy ) suggest that capture efficiency and thermal stability observed on the CaAl-550 sample can be attributed to the aluminum presence, as .
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Acknowledgments
Authors thank the technical assistance of A. Tejeda, G. Zedillo, and O. Novelo. This work was performed into the PUNTA-IMPULSA framework and financially supported by UNSPECIFIEDICyT-DF-179/2009 and UNSPECIFIEDCONACyT-60980 projects.
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Published In
Journal of Environmental Engineering
Volume 137 • Issue 11 • November 2011
Pages: 1058 - 1065
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jun 1, 2010
Accepted: May 17, 2011
Published online: May 18, 2011
Published in print: Nov 1, 2011
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