A new synthesis route to Li4SiO4 as CO2 catalytic/sorbent

An alternate method for the synthesis of a carbon dioxide (CO2) capture catalytic/sorbent, Li4SiO4, has been developed. This method consists in mixing two precursors in a solid suspension, one being incorporated in an aqueous solution (LiNO3) and the other in a suspended phase (SiO2). Thermodynamic analysis and characterization results (X-ray diffraction (XRD), scanning electronic microscopy (SEM) and thermo-gravimetric (TGA) reactor techniques suggest a significant effect on the particle size towards the formation of desired phase Li4SiO4. TGA-CO2 sorption conversions reported in this work resulted in higher conversion (98%) and reaction rate than reported up to date (83%). Furthermore, lower synthesis temperatures (900 °C) are achieved through this alternate synthesis than the actual method of solid solution (1000 °C). Only slight sintering problems were encountered.