Effect of the Particle Size of Quartz Powder on the Synthesis and CO₂ Absorption Properties of Li₄SiO₄ at High Temperature

Abstract

Li 4 SiO 4 was obtained by using quartz powder of different particle sizes (75−180 μm, 45−75 μm, 38−45 μm, and <38 μm) and Li 2 CO 3 as raw materials through a solid-state reaction at 720 °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 the samples. The results indicated that when the particle size of the quartz powder decreased, the solid-state reaction performed more completely, the content of the Li 4 SiO 4 phase increased, and the size of the grain agglomerates decreased gradually. The enhanced chemical reactivity of the quartz powder with Li 2 CO 3 and the shortened diffusion distance as the quartz size decreases are helpful to the formation of the Li 4 SiO 4 phase. The sorption analysis revealed that the samples synthesized using the quartz powder with smaller particle sizes experienced a more rapid absorption−desorption process with a higher absorption efficiency.

High temperature capture of CO2on Li4SiO4-based sorbents from biomass ashes

“…This distinct phase composition can be ascribed to the different physical properties of the raw materials. It was demonstrated that an increasing of SiO 2 content and the reducing of raw materials' particle size was helpful to the synthesis of Li 4 SiO 4 . Because of the fact that the pretreatment rice straw ash presented the larger amount of SiO 2 and the smaller particles size than those of the other biomass ash (Figure ), its resulting PR‐Li 4 SiO 4 sorbent was performed more completely in the solid‐state reaction and contained the higher phase purity of Li 4 SiO 4 .…”

“…Various synthesis strategies such as solid‐state reactions , impregnated suspension , sol−gel method , and precipitation were considered to synthesize Li 4 SiO 4 sorbents. Meanwhile, the sources of Si including quartz , amorphous silica (SiO 2 ) , tetraethyl orthosilicate (TEOS) , and the precursors of Li involving Li 2 CO 3 , LiOH·H 2 O, LiNO 3 , and CH 3 COOLi were also examined. It was also demonstrated that the CO 2 capture performance could be improved by introducing appropriate dopants into the Li 4 SiO 4 crystal structure.…”

Influence of the K‐, Na‐ and K‐Na‐carbonate additions during the CO2 chemisorption on lithium oxosilicate (Li8SiO6)

“…Reaction (2) was evidenced at this temperature and it is in good agreement with other reports showing that Li 4 SiO 4 is able to chemisorb CO 2 between 460 and 580 °C. 16,[23][24][25][26][27][28]34 Th e last isothermal comparison was performed at 650 °C ( Fig. 9).…”

“…8 Among these materials, lithium silicates have been reported as good solid candidates for CO 2 sorbents in terms of large CO 2 sorption capacity and high operating temperatures. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Recently, Durán-Muñoz et al 22 published that lithium oxosilicate (Li 8 SiO 6 ) is able to capture CO 2 over a wide temperature range with an experimental maximum capacity of 11.8 mmol CO 2 per gram of ceramic (theoretical 16.6 mmol/g). In addition, they reported that the Li 8 SiO 6 -CO 2 mechanism depends on the reaction temperature.…”

High‐Temperature Capture of CO2 on Lithium‐Based Sorbents Prepared by a Water‐Based Sol‐Gel Technique

“…Many synthesis strategies, such as solid‐state reactions 15, impregnated suspension 16, the sol‐gel method 17, 18, and precipitation 17, 19, have been developed to prepare Li 4 SiO 4 sorbents. It was demonstrated that the performance of CO 2 capture mainly depended on the nature of the starting materials, including the silicon source such as quartz 20, amorphous silica (SiO 2 ) 21, tetraethyl orthosilicate (TEOS) 17, and some environment‐friendly silicon materials (e.g., fly ashes 22, rice husk ashes 23, and diatomite 24). The precursors of Li 17, 25 involve Li 2 CO 3 , LiOH·H 2 O, LiNO 3 , and CH 3 COOLi.…”