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《Journal of South China University of Technology(Natural Science Edition)》 2011-01
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Synthesis,Characterization and CO_2 Adsorption Simulation of Lithium Zirconate

Yuan Wen-hui1 Liang Jie1 Li Li2(1.School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.School of Environmental Science and Engineering,South China University of Technology,Guangzhou 510006,Guangdong,China)  
In order to improve the stability and adsorption rate of lithium zirconate(Li2ZrO3),fine powders of pure Li2ZrO3 were prepared by means of citric acid-ethylene glycol complexation,with lithium nitrate and zirconyl nitrate as the starting materials.Then,the thermal decomposition of the precursor was analyzed using a comprehensive thermal analyzer,and the precursor and the Li2ZrO3 powders were characterized by means of XRD,SEM and TG-DSC.Moreover,the effects of calcination temperature and time on the formation of tetragonal crystalline grains were analyzed.The results indicate that the crystal phase of the Li2ZrO3 powders synthesized at 800 ℃ for 150 min is te-tragonal,holonomic and homogeneous,that the optimal temperature for CO2 adsorption by the powders under programmed heating and constant high-temperature status is 600 ℃,at which the 90 min adsorption capacity reaches 23.7% of the lithium zirconate mass when CO2 flows at a rate of 45 cm3/min.In addition,a new solution to the proposed adsorption model is also presented in this paper,which is verified with the adsorption data by simulation,and the simulated results accord well with the experimental ones.
【Fund】: 广东省自然科学基金资助项目(06025657)
【CateGory Index】: O614.111
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