Preparation and characterization of Ca3SiO5 as a new CO2 sorbent

摘要

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.