Further study on the property of absorbing CO₂ with Li ₂ZrO₃ material

Lithium zirconate (Li₂ZrO₃) materials were synthesized from two different structured zirconium oxide (ZrO₂), monoclinic ZrO₂ (ZrO₂(m)) and tetragonal ZrO₂ (ZrO₂(t)), and their absorption rate of CO₂ were compared. The results showed, in 20% CO₂ (80% Air) atmosphere, their absorption abilities were significantly different where the ZrO ₂(t)-synthesized material evidently absorbed at a faster rate than the ZrO₂(m)-synthesized one. The ZrO₂(t)-synthesized Li₂ZrO₃ reached absorption equilibrium after being kept for 3 h at 500°C in 20% CO₂ (80% Air) atmosphere, and attain to absorption capacity of 25(±0.6)%(wt). While at the same conditions, the absorption capacity for ZrO₂(m)-synthesized Li₂ZrO ₃ is only 9(±0.6)%(wt). In addition, the effects on the structure of Li₂ZrO₃ and the absorption capability of CO₂ from the amount of Li₂CO₃ in the reactants were investigated. Doping potassium (K) impacted the CO₂ absorption rate of the Li₂ZrO₃ synthesized from ZrO₂(t) slightly, but obviously on the Li₂ZrO₃ synthesized from ZrO₂ (m), and the absorption rate reached peak value at Li ₂CO₃:ZrO₂:K₂CO₃=1:1:0.03.