A Liquid Phase Method Combined with Freeze-Drying Technique to Lithium Silicate Materials and Their Carbon Dioxide Absorption Properties at High Temperatures
Abstract: A liquid phase method combined with the freeze-drying technique was developed to synthesize Li4SiO4 materials using LiOH∙H2O, LiNO3, Li2CO3 and silica sol as the lithium and silicon sources, respectively. The weight loss behaviors of the prepared Li4SiO4 precursors were investigated by the thermal gravimetric analysis (TGA). The structure and morphology of the prepared Li4SiO4 materials were characterized by XRD and SEM, respectively. The CO2 absorption properties of prepared Li4SiO4 were investigated by thermal gravimetric analysis (TGA). The results show that the Li4SiO4 material prepared using LiOH∙H2O as the lithium source presents the best CO2 absorp-tion property among the prepared Li4SiO4 materials. The CO2 absorptions at different temperatures and different CO2 partial pressures have been performed on the optimized Li4SiO4 material. The absorbed amount of CO2 reaches 24.1 wt.% within 5 min and an equilibrium amount of 29.9 wt.% is achieved within 10 min at 550˚C and a partial pressure of 0.25 bar. Additionally, after five absorption-desorption cycles, the sorbent still maintains its original properties in terms of capture rate and absorption amount.
文章引用: 童 沂 , 黄雪芹 , 许春慧 , 肖 强 , 钟依均 , 朱伟东 (2015) 液相法结合冷冻干燥技术制备Li4SiO4材料及其高温二氧化碳吸收性能。 物理化学进展， 4， 77-83. doi: 10.12677/JAPC.2015.42010
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