Abstract: With nanometer-sized monoclinic ZrO₂, lithium carbonate, and potassium carbonate as starting materials, according to n(Li₂CO₃) : n(ZrO₂) : n(K₂CO₃) = 1 : 1 : 0.03, potassium-doped lithium zirconate absorbents were prepared by high-temperature solid-state reaction. Their CO₂-absorption cycle-properties were measured with a thermogravimetric analyzer. The crystal structure of the re-prepared absorbents was studied by comparison of their XRD patterns. The microscopic morphologies of re-prepared absorbents were viewed by a sanning electron microscopy. The experimental results showed, after absorption of CO₂, the material could be re-prepared, whose performance of absorbing CO₂ for the second time is affected by the temperature and air flux during re-preparation. When the temperature is 750℃ and the air flux is 100mL/min, the re-prepared material has good cycle ability to absorb CO₂.

Key words: lithium zirconate, absorption, CO₂, TG

摘要： 以纳米级单斜相ZrO₂为反应物，按照n(Li₂CO₃) : n(ZrO₂) : n(K₂CO₃) = 1 : 1 : 0.03的比例制备了可在高温460～650℃下直接吸收CO₂的锆酸锂材料。使用热重分析仪（TG）进行了循环吸收CO₂性能的研究, 采用扫描电镜（SEM）、X－射线衍射仪（XRD）对再次合成的材料分别进行了形貌、结构的分析。实验结果表明，在吸收CO₂后材料的再次合成过程中合成温度及空气流量影响材料吸收CO₂的循环性能，在再次合成温度为750℃，空气流量为100mL/min的条件下，合成的材料具有良好的循环吸收CO₂的性能。

关键词: 锆酸锂, 吸收, CO₂, 热重分析仪