Li₄SiO₄ modification on the surface of amorphous silica porous body and CO₂ removal method characteristics

Abstract

Lithium silicate (Li₄SiO₄) is one of the most promising carbon dioxide (CO₂) capture materials at high temperatures. In this study, Li₄SiO₄ on silica (SiO₂) porous structure was tried to fabricate in solid state reaction for CO₂ capture materials. Li₂CO₃ reacted with amorphous SiO₂ on the surface of silica porous structure made by template method, resulting in the formation of Li₄SiO₄ porous structure on silica support at 800 °C. The obtained Li₄SiO₄ porous structure can capture CO₂ at 600 °C and release it at 700 °C, and could be used stably and repeatedly. This Li₄SiO₄ porous structure is expected to be useful as a CO₂ capture material at high temperature.