Manufacturing of the high-temperature CO2 sorbents from titanic nanoparticles doped calcium aluminate carbonates

A method for manufacturing high-temperature CO2 sorbents using TiO2 nanoparticles with calcium aluminate carbonates is presented. The sorbents were synthesized by coprecipitation of Ca2+ and Al3+ ions on TiO2 powder by Na2CO3/NaOH solution titration. The mechanism may involve dissolution of Ti4+ ions followed by the redeposition of calcium titanate over the TiO2 surface. With synthetic Ca Al OO3/TiO2 composite as the CO2 sorption material, it exhibits high sorption capacity and durable stability at 750 degrees C. Thermogravimetric analysis (TGA) results showed that greater than 95% cyclic stability was accomplished after 10 cycles at 750 degrees C. Capturing capacity decreased with a high inlet CO2 volume, which was around 55 wt.%, 45 wt.%, and 30 wt.% for 0.05 L/min (TGA), 0.3 L/min (1 kW), and 2.0 L/min (10 kW), respectively. In a 10 kW fixed-bed reactor test, the removal ratio was kept at 80% to 90%. The reason for the reduction in the deterioration of the sorbent during the multicyclic test could possibly be the formation of an anti-sintering compound of CaTiO3 and related calcium aluminate oxides. This Ca Al-O/TiO2 configuration provides a feasible route for scale-up production of cheap CO2 sorbents.