关键词: 掺钾Li₂ZrO₃, 柠檬酸-乙二醇络合法, 吸附速率

Abstract:

Super-fine K-doped Li₂ZrO₃ powders were synthesized via the citric acid-ethylene glycol complexing, with the nitrates of lithium, zirconyl and potassium as the materials. Then, the precursor of K-doped Li₂ZrO₃and the K-doped Li₂ZrO₃ powders were characterized by means of TG-DSC, XRD and SEM. Moreover, the thermal decomposition of the gel and the formation of the tetragonal crystalline form were analyzed. The results indicate that the crystal phase of super-fine K-doped Li₂ZrO₃powders calcined at 800 ℃ for 150min is tetragonal, holonomic and homogeneous, that the increase of calcination temperature promotes the grain growth and the densification. TG-DSC results in CO₂ atmosphere at programmed temperature and constant high temperature show that, at the optimum adsorption temperature, 500℃ , the adsorption capacity of K-doped Li₂ZrO₃ powders for CO₂ is up to 29.5% after 90 min, with a CO₂ flux of 15 cm³/min.

Key words: K-doped Li₂ZrO₃, itric acid-ethylene glycol complexing, dsorption rate