High temperature adsorption of carbon dioxide on Cu–Al hydrotalcite-derived mixed oxides: kinetics and equilibria by thermogravimetry

The effect of Cu/Al molar ratio on the high-temperature adsorption characteristics of CO 2 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 temp...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2009-09, Vol.97 (3), p.885-889
Main Authors: Lwin, Ye, Abdullah, Firdaus
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aluminum
Analytical Chemistry
Carbon dioxide
Chemisorption
Chemistry
Chemistry and Materials Science
Copper
Exact sciences and technology
General and physical chemistry
Inorganic Chemistry
Measurement Science and Instrumentation
Mixed oxides
Physical Chemistry
Polymer Sciences
Solid-gas interface
Surface physical chemistry
Thermogravimetry
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Summary:The effect of Cu/Al molar ratio on the high-temperature adsorption characteristics of CO 2 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 CO 2 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).
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-009-0156-7