Effect of the ParticleSize of Quartz Powder on the Synthesis and CO2AbsorptionProperties of Li4SiO4at High Temperature.

Li4SiO4was obtained by using quartzpowder of different particle sizes (75–180 μm, 45–75μm, 38–45 μm, and <38 μm) and Li2CO3as raw materials through a solid-state reaction at720 °C. X-ray diffraction (XRD), scanning electron microscopy(SEM), and differential thermal analysis and thermogravimetry (DTA/TG)were used to examine the sintering behavior and properties of thesamples. The results indicated that when the particle size of thequartz powder decreased, the solid-state reaction performed more completely,the content of the Li4SiO4phase increased,and the size of the grain agglomerates decreased gradually. The enhancedchemical reactivity of the quartz powder with Li2CO3and the shortened diffusion distance as the quartz size decreasesare helpful to the formation of the Li4SiO4phase.The sorption analysis revealed that the samples synthesized usingthe quartz powder with smaller particle sizes experienced a more rapidabsorption–desorption process with a higher absorption efficiency. [ABSTRACT FROM AUTHOR]