CO₂ absorption of Li₄SiO₄ at high temperature

Li₄SiO₄ used as a CO₂ absorbent at 500 °C to 750 °C was synthesized by SiO₂ and Li ₂CO₃. The crystal structure and microstructure of Li ₄SiO₄ materials were characterized by XRD and SEM, respectively, and the CO₂-absorption ability of the Li ₄SiO₄ materials was studied by TG. The results showed that Li₄SiO₄ with good ability of CO₂ absorption could be prepared at 750 °C for 6 h. The absorbing balance in CO₂ atmosphere could be arrived during 15 min at 700 °C, and the absorption amount was about 43%(wt). The synthesis conditions were optimized and the absorption capacity was improved as compared to literature methods.