CO2 Absorption Performance of Li4SiO4 Prepared from Coal-Kaolin
LIU Yu-Lan, DING Tong, MA Zhi, QI Xiao-Zhou, ZHANG Hui
(School of Chemical Engineering and Technology, Tianjin University, Tianjin Key Laboratory of Catalysis Science and Engineering, Tianjin 300072, China)
Abstract：
Lithium orthosilicates (Li4SiO4) is a hightemperature CO2 sorbent. It separates CO2from gas mixture based on a chemical reaction. In this paper, we have prepared Kaolin-Li4SiO4 successfully. With silicon dioxide made from the waste residue of acid processing coalkaolin and lithium carbonate as raw materials, KaolinLi4SiO4 was prepared by high temperature solid-state reaction. The microscopic morphologies of absorbents were viewed by scanning electron microscopy(SEM). The samples were characterized by X-ray diffraction (XRD) patterns. The performance of CO2 absorption was measured with a thermogravimetric analyzer (DTA-TG). The result indicated that the material exhibited good ability to absorb CO2, the biggest absorption capacity was up to 31.07% (mass fraction). Compared with the Li4SiO4 prepared with commercial SiO2 as silica source, the CO2 absorption of Kaolinlithium silicate was faster at low temperature. So Kaolinlithium silicate has a significant advantage of CO2 absorption at low temperature.
LIU Yu-Lan, DING Tong, MA Zhi, QI Xiao-Zhou, ZHANG Hui.CO2 Absorption Performance of Li4SiO4 Prepared from Coal-Kaolin[J]. Chemcial Industry and Engineering, 2013,30(5): 11-15
2013, Vol. 30 
