(71d) Structure Promoted Ca-Based Sorbents for Highly Reversible Carbon Dioxide Uptake at High Temperatures

Reaction based inorganic metal oxides have advantages of reacting with CO₂ at high temperature over other sorbents. We show here that the structure promoted calcium based sorbent is promising for CO₂ uptake. The sorbents were made by soft chemical routes, and flame spray pyrolysis (FSP) in the gas phase. The sorbents were particles having high specific surface areas even as high as 120 m²/gram. The CO₂ uptake at various temperatures was determined by thermogravimetric analysis. The sorbents showed high capacity for CO₂ uptake at high temperature. To study the reversibility of the sorbents, several dozens of carbonation/decarbonation cyclic operations were performed. The sorbents demonstrated stable and reversible behavior and high CO₂ uptake capacity, sustaining maximum molar conversion at about 40% even after 100 cycles of operations. Relationship with the high reversible performance and their structure were discussed.