CO_2吸附剂掺钾锆酸锂的制备及性能表征  

Synthesis and Property Characterization of K-Doped Li_2ZrO_3 for CO_2 Adsorption

作　　者：袁文辉[1] 王婵月[1] 阎慧静[1] 李莉[2] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640 [2]华南理工大学环境科学与工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2008年第7期26-31,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省自然科学基金资助项目(06025657)

摘　　要：采用柠檬酸-乙二醇络合法,以硝酸锂、硝酸氧锆、硝酸钾为原料制备了掺钾Li2ZrO3超细晶体粉末,采用TG-DSC、XRD、SEM等方法对掺钾Li2ZrO3的前驱体及掺钾Li2ZrO3晶体粉末进行了表征,分析了凝胶的热分解变化过程和四方晶形结构的形成过程.结果表明:在800℃下焙烧150min,制备出的掺钾Li2ZrO3超细晶体粉末为完整、均匀的四方晶型,提高焙烧温度有利于晶粒生长和致密化.对掺钾Li2ZrO3晶体粉末在程序升温和高温恒温状态下吸附CO2的性能的研究表明,最佳吸附温度为500℃,在此温度下,当CO2流量为15 cm3/min时,90min样品吸附CO2量可达吸附剂质量的29.5%.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 Li2ZrO3 and 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 Li2ZrO3 powders 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 cm^3/min.

关 键 词：掺钾Li2ZrO3 柠檬酸-乙二醇络合法 吸附速率 

分 类 号：TB66[一般工业技术—制冷工程]