Improvements of calcium oxide based sorbents for multiple CO2 capture cycles

This study presents the development of a novel calcium-oxide sorbent for carbon dioxide capture. In this work, CaO sorbent was impregnated with different molar percentage of titanium ethoxide. The sorbent prepared with 50% of titanium ethoxide resulted in the best uptake characteristics for CO2. Compared to others, a higher BET surface area and a larger pore volume were observed. An excellent stability during extended carbonation–decarbonation cycles was also demonstrated. The high titanium content limits the sintering of particles and thus stabilizes the microstructure of CaO. Carbonation/decarbonation cycles of limestone Tamuin: ● and impregnated CaO with 50% of titanium ethoxide: ▪ CaTi-40 and CaTi-50 were identified as promising sorbents for CO2 capture; they exhibit very high CO2-capture capacity and a strong stability during the course of multicyclic carbonation–decarbonation testing. [Display omitted] ► CaTi-40 and CaTi-50 are very stable and promising CO2 absorbents. ► The high titanium content limits the sintering of particles and stabilizes CaO. ► After 30 cycles, reactivity of CaTi-50 is clearly superior to that of limestone.