Abstract
The effect of Cu/Al molar ratio on the high-temperature adsorption characteristics of CO2 on the mixed oxides of Cu–Al hydrotalcite skeletal structure has been studied by thermogravimetry. The Cu/Al molar ratio of the hydrotalcites synthesized was varied between 1.0 and 3.0, and the adsorption temperature ranged from ambient to 600 °C. The hydrotalcite with Cu/Al molar ratio of 2.0 was found to be the most suitable adsorbent for high-temperature CO2 adsorption, in both the capacity and the rate of adsorption. The activation energy values suggested that the physical adsorption dominates at low temperatures (<400 °C) and the chemisorption dominates at high temperatures (>400 °C).
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Acknowledgments
Much of this work was performed in the Universiti Sains Malaysia, which supported financially through the Short-term Grant FPP 052-2003. The first author would also like to acknowledge the support provided by the Universiti Malaysia Perlis and the Universiti Teknologi PETRONAS in preparing this document.
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Lwin, Y., Abdullah, F. High temperature adsorption of carbon dioxide on Cu–Al hydrotalcite-derived mixed oxides: kinetics and equilibria by thermogravimetry. J Therm Anal Calorim 97, 885–889 (2009). https://doi.org/10.1007/s10973-009-0156-7
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DOI: https://doi.org/10.1007/s10973-009-0156-7