%0 Journal Article %T High Performance of Fly Ash Derived Li 4SiO4-Based Sorbents for High Temperature CO2 Capture %A Shenggen Wu %A Xiaoli Liang %A Qi Zhang %A Guiru Zhang %J Journal of Encapsulation and Adsorption Sciences %P 1-17 %@ 2161-4873 %D 2021 %I Scientific Research Publishing %R 10.4236/jeas.2021.111001 %X It is urgent to develop excellent solid CO₂ sorbents with higher sorption capacity, simpler synthetic process, better thermal stability and lower costs of synthesis in CO₂ capture and storage technologies. In this work, a number of Li₄SiO₄-based sorbents synthesized by lithium carbonate with three different kinds of fly ashes in various molar ratios were developed. The results indicate that the Li₂CO₃:SiO₂ mole ratio used in the sorbents synthesis significantly affects the CO₂ absorption properties. The sorption capacity increased with the excess of Li₂CO₃ first and then decreased when the excessive quantity was beyond a certain amount. The experiments found that FA-Li₄SiO₄_0.6, CFA-Li₄SiO₄_0.4, HCl/CFA-Li₄SiO₄_0.3 presented the best sorption ability among these fly ash derived Li₄SiO₄ samples, and the corresponding weight gain was 28.2 wt%, 25.1 wt% and 32.5 wt%, respectively. The three sorbents with the optimal molar ratio were characterized using various morphological characterization techniques and evaluated by thermogravimetric analysis for their capacity to chemisorb CO₂ at 450&degC - 650&degC, diluted CO₂ (10%, 20%) and in presence of water vapor (12%). The adsorption curve of FA- Li₄SiO₄_0.6 at different temperatures was simulated with the Jander-Zhang model to explore the influence of carbon dioxide diffusion on adsorption reaction. Further experiments showed that the adsorbent had a good sorption capacity in a %K Fly Ash %K Lithium Orthosilicates %K Molar Ratios %K CO< %K sub> %K 2< %K /sub> %K Capture %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=107853