Synthesis and CO 2 absorption property of Li 4 TiO 4 oxide were studied by X-ray powder diffraction and thermogravimetry. Samples were prepared by the solid state method using Li 2 CO 3 and Anatase or Rutile TiO 2 as starting reagents. From the results of XRD, it was found that single phase Li 4 TiO 4 can be obtained from Anatase TiO 2 and Li 2 CO 3 with 1 : 2.1 molar ratio in an alumina cell in atmosphere of Ar : H 2 80 vol! : 20 vol! gas mixture 150 mLmin of flow rate by heat-treatment up to 1000? C with 5? Cmin of heating rate. By the results of thermogravimetry, it was found that single phase Li 4 TiO 4 can absorb CO 2 in the temperature range of 300? C to 856? C, and the maximum absorption is 42 mass! at 856? C. From the results of XRD, LiTiO x and Li 2 CO 3 phases were found in the Li 4 TiO 4 sample after complete CO 2 absorption. Therefore, it is supposed that following reaction occurs in the reaction process between Li 4 TiO 4 and CO 2 . 42 mass! of the maximum absorption could be predicted on the basis of the reaction. Li 4 TiO 4 s 1.5CO 2 g !LiTiO x s 1.5Li 2 CO 3 s 2.5-x 2 O 2 g x 2Ĭ2.5
The CO 2 absorption property of Li 4 SiO 4 was investigated by thermogravimetry. Two kinds of sintered Li 4 SiO 4 samples were prepared at 700? C and 1000? C. The CO 2 absorption rate of the powdered Li 4 SiO 4 samples was measured in 100 vol! CO 2 atmosphere at nine selected temperatures in the 620Ĭ700? C region, and the measured data were discussed by the rate theory. The CO 2 absorption reaction of the Li 4 SiO 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 115 kJmol in the 620-660? C region and about 56 kJmol in the 680-700? C region. The large difference between these activation energies seems to depend on the surface state of the Li 4 SiO 4 particle reacting with CO 2 .
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