影响Li2ZrO3在高温下吸收CO2的因素

于不同条件下合成了一系列用于在高温下吸收CO2的Li2ZrO3材料.用扫描电子显微镜（SEM）、X射线粉末衍射仪（XRD）分别观察和评价了合成材料的表面形貌与结构特征,使用热重分析（TG）仪研究了Li2ZrO3材料吸收CO2的性能.实验结果表明,合成温度影响材料的结构和表面性质,从而影响材料吸收CO2的性能,在800 ℃合成的Li2ZrO3材料吸收CO2的性能比较好,合成温度过高或过低都不利于材料吸收CO2.同时,气氛中CO2的含量也影响材料吸收CO2的速度,在CO2体积百分含量比较高的条件下,材料吸收CO2的速度较快.此外,本研究不进行任何元素的添加即可合成出吸收性能比较好的Li2ZrO3材料.

The Influencing Factor for CO2 Absorption of Li2ZrO3 at High Temperature

Li2ZrO3 materials were synthesized under different conditions for CO2 absorption at high temperature. The crystal structure of the Li2ZrO3 material was analyzed using an X-ray powder diffractometer (XRD), the surface morphologies of all the samples were observed by using scanning electron microscopy (SEM) and the CO2-absorption ability of the Li2ZrO3 material was studied using a thermogravimetric (TG) analyzer. The experimental results show that the synthesis temperature affects both the structure (Fig.3) and the morphology (Fig.4) of the material, and hence its CO2 absorption ability. As a result, Li2ZrO3 materials synthesized at 800 ℃ exhibit superior absorption ability; whereas Li2ZrO3 materials derived under either excessively high or low synthesis temperatures show poorer absorption ability (Fig.2). In addition, the CO2 concentration in the atmosphere also has influence on the CO2 absorption rate of the Li2ZrO3 material. Li2ZrO3 materials display better absorption abilities at higher percentage concentrations of CO2 in the atmosphere (Fig.5). Furthermore, the Li2ZrO3 material in this research, which displayed better absorption ability, was synthesized without doping any elements.