https://doi.org/10.3390/nano11123188
“The incorporation of titanium additives can introduce calcium titanium oxide (CaTiO3) into CaO-based adsorbents. This introduction can be expected to alleviate the CaO-based adsorbent sintering problem, owing to its thermal stability at the working temperature of CaO-based adsorbents [24,25]. Yu et al. used the precipitation and deposition method to prepare Ca/Al/Ti sorbents. The capture capacity was reduced less than 5% after 10 cycles of the capture–regeneration experiment as small amount of titania were introduced. Wu et al. prepared CaTiO3/nano-CaO by the hydrolysis method. The authors found that the high melting point of CaTiO3 can improve the cyclic stability of CaO-based adsorbents. The sorbent almost retained its capacity after 40 repeated uses.”
“In the typical preparation, 11.5 mL of acetic acid (Nacalai, Nacalai Tesque, Kyoto, Japan, 99%), 5 mL of hydrochloric acid (Nacalai, Nacalai Tesque, Kyoto, Japan, 35%), 60 mL of alcohol (Nacalai, Nacalai Tesque, Kyoto, Japan, >99.5%), calcium nitrate 4-hydrate (Ca(NO)3 · 4H2O, Macron, Avantor Inc., Radnor, PA, USA), and 6 g of F127 (Sigma-Aldrich, Sigma Ltd., Saint Louis, MO, USA) were added in 17 mL of tetrabutyl orthotitanate (Ti(OC4H9)4, Sigma-Aldrich, Sigma Ltd., Saint Louis, MO, USA, 97%) sequentially. The mole ratio of Ca(NO)3 · 4H2O to Ti(OC4H9)4 was 1.2/2/3/5. The mixture was stirring until all chemicals totally dissolved. Then, the transparent mixture solution was transformed to aerosol by nozzle first, and then passed through a 400 °C furnace. The as-prepared product was collected on filter paper. The sorbent was obtained by calcination at 700 °C for 30 min with a 1 °C/min heating rate. The received sorbent was named as CaTi-x, where x represents the mole ratio of calcium to titanium.”
“Figure 4. CO2 capture performance of calcium-based sorbents: (a) CaTi-1.2, (b) CaTi-2, (c) CaTi-3, (d) CaTi-5.”
