CO₂ absorption properties of lithium ferrite for application as a high-temperature CO₂ absorbent

Lithium ferrite was investigated with a view to its application as a new CO₂ absorbent capable of absorbing CO₂ at around 500°C and emitting CO₂ at temperatures of less than 750°C. From the TG analysis, equilibrium temperature of lithium ferrite, at which CO₂ absorption apparently stops and emission starts, is found to be around 530°C. This temperature is almost the same as that obtained from thermodynamic calculation and about 200°C lower than those of Li ₂ZrO₃ and Li₄SiO₄. The absorption rate increased as the absorption temperature increased up to 500°C. On the other hand, CO₂ emission was completed in about 10 min even in pure CO₂ at temperatures of more than 600°C.