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Lithium silicate (Li 4 SiO 4 ) and lithium zirconate (Li 2 ZrO 3 ) absorb CO 2 in a lower temperature range and the absorbed CO 2 is released reversibly in a higher temperature region. In this study, various metal oxides and hydroxides and their complex oxides containing Li were investigated for their CO 2 absorption properties at different temperatures in order to get better understanding of the related mechanism. The inflection points in the TG curves, at which predominant reaction changes from CO 2 absorption to CO 2 release, are observed at around 973 K for Li 4 SiO 4 and Li 2 ZrO 3 . The CO 2 absorption is based on the formation of Li 2 CO 3 through the decomposition of Li-containing complex oxides. From the experimental results and thermodynamical calculations, it is noticed that CO 2 absorption takes place very slowly in spite of large equilibrium constant in the lower temperature region below 873 K, while the absorption at 973 K happens quickly. When the absorption at 973 K and the release at 1273 K are repeated 5 times for Li 4 SiO 4 , the material maintains its crystal structure to give CO 2 absorption and release. On the other hand, CaO shows an inflection point at 1173 K in the TG curve. Magnesium oxide and hydroxide do not react with CO 2 below 1273 K.

Absorption and Release of Carbon Dioxide with Various Metal Oxides and Hydroxides