Preparation and characterization of Ca3SiO5 as a new CO2 sorbent

Developing a promising CO₂ sorbent is necessary during CO₂ emission reduction process. Ca₃SiO₅ was synthesized by a solid state reaction of CaCO₃ with SiO₂, and characterized via X-ray diffraction (XRD) analysis, thermogravimetric analysis (TGA) and scanning electronic microscope (SEM). The investigation results showed that reaction of CO₂ sorption and desorption is reversible. The optimal operation temperature is 800°C at which 55.08% increase of the weight of the sorbent at most was acquired in the flow of 15% CO₂ in N₂, the simulation flue gases. Ca₃SiO₅ also exhibited favorable cycle properties, CO₂ sorption efficiency dropped from 55.08% to 18.65% after 17 cycles of CO₂ sorption-desorption processes. The decay rate is about 2.14% per cycle averagely, caused by specimen melt and consequent diffusion impacts. The cheap and high efficient sorbent will be used extensively in future.