熱重量分析を用いたLi_4SiO_4の CO_2吸収反応の反応速度論的解析

概要

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The CO_2 absorption property of Li_4SiO_4 was investigated by thermogravimetry. Two kinds of sintered Li_4SiO_4 samples were prepared at 700℃ and 1000℃. The CO_2 absorption rate of the powdered Li_4SiO_4 samples was measured in 100vol% CO_2 atmosphere at nine selected temperatures in the 620〜700℃ region, and the measured data were discussed by the rate theory. The CO_2 absorption reaction of the Li_4SiO_4 would be a pseudo first order reaction. For these samples, apparent reaction rate constants k were measured at different measurement temperatures, and activation energies were estimated by the Arrhenius plot. For both the samples, the estimated activation energies were about 115kJ/mol in the 620-660℃ region and about 56kJ/mol in the 680-700℃ region. The large difference between these activation energies seems to depend on the surface state of the Li_4SiO_4 particle reacting with CO_2.
社団法人日本セラミックス協会の論文
2007-08-01