In this study, high-temperature CO2 capture by solid sorbent based on lithium orthosilicate (Li4SiO4) was
investigated in the presence of gas contaminants, such as NO and SO2. Simulated flue gas containingCO2 (4
vol%), SO2 (up to 2,000 ppm), and NO (up to 1,000 ppm) was used during the CO2 capture process. The CO2
sorption properties of the sorbent were investigated at high temperature (580 °C) by a thermal gravimetric
analyzer (TGA).
The tested sorbent showed high CO2 sorption capacity (210 mg CO2/g sorbent) along with high absorption
rates, and lower regeneration temperature than other solids such as calcium oxide. The results also showed
that the solid sorbent is inert with respect to NO. Instead, the presence of SO2 resulted in a negatively effect
on the sorption capacity of the sorbent, due to an irreversible reaction with the adsorbent. Thus, industrial
application would require desulfurization of flue gas prior to contacting the sorbent