Novel Fluidizable K‑Doped HAc-Li4SiO4 Sorbent for CO2 Capture Preparation and Characterization

A novel fluidizable K-doped HAc-Li4SiO4 sorbent using an incipient impregnation method was prepared in this work. The produced sorbent displayed an excellent CO2 sorption capacity and stability under expected reaction conditions. Glacial acetic acid treatment was first used to modify the Li4SiO4 sorbent microstructure. Following this step, an incipient impregnation method was applied to dope potassium onto the sorbent in order to further enhance the sorbent sorption capacity. This novel K-doped HAc-Li4SiO4 sorbent was characterized using X-ray diffraction, N2 adsorption–desorption, CO2 temperature-programmed carbonation (CO2-TPC), and CO2 temperature-programmed decarbonation (CO2-TPDC) analyses. The experimental results showed that the CO2 sorption capacity of the K-doped HAc-Li4SiO4 sorbent is approximately 100 cm3 STP CO2/g sorbent. This was five times that of the Li4SiO4 sorbent. Furthermore, the cyclic test of the K-doped HAc-Li4SiO4 sorbent demonstrated it to be high and stable for CO2 capture.