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

• Main Authors: Lwin, Y., Abdullah, F.
• Format: Citation Index Journal
• Published: Springer 2009
• Subjects: TP Chemical technology
• Online Access: http://eprints.utp.edu.my/665/1/paper.pdf; http://www.scopus.com/inward/record.url?eid=2-s2.0-70350365841&partnerID=40&md5=ecc66a40de77a9eb621e600bd4600b0a; http://eprints.utp.edu.my/665/

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). © 2009 Akadémiai Kiadó, Budapest, Hungary.