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LiOH·H2O在空气中的失水动力学研究
Kinetics of Thermal Decomposition of LiOH·H2O in Air
【摘要】 用热分析技术热重法、差热分析法及微分热重法(TG-DTA/DTG)研究了Li OH.H2O(氢氧化锂)在空气中的热分解过程。热分析结果表明,Li OH.H2O在空气中分两步分解。用Friedman法、Flynn-Wall-Ozawa(FWO)法和ASTM E698法求取了Li OH.H2O脱水过程的活化能E为85.71 kJ/mol,指前因子以lgA表示,其值为9.81,失水过程拟合的最可几模型为Bna,即自催化的n级反应,动力学模式函数为f(α)=αa(1-α)n。
【Abstract】 The thermal decomposition processes taking place in the solid-state LiOH·H2O have been studied in air using TG-DTA/DTG techniques.TG-DTA/DTG curves showed that the decomposition proceeded through two well-defined steps in air.The activation energies of dehydration process were calculated through Friedman,Flynn-Wall-Ozawa(FWO) and ASTM E698 methods,and the possible kinetic modelling and parameters have been estimated through the multiple-linear regression method.
【关键词】 LiOH.H2O;
TG-DTA/DTG;
热分解;
非等温动力学;
【Key words】 LiOH·H2O; TG-DTA/DTG; Thermal decomposition; Non-isothermal kinetics;
【Key words】 LiOH·H2O; TG-DTA/DTG; Thermal decomposition; Non-isothermal kinetics;
【基金】 国家自然科学基金(No.20071026)
- 【文献出处】 分析科学学报 ,Journal of Analytical Science , 编辑部邮箱 ,2009年06期
- 【分类号】O643.1
- 【被引频次】5
- 【下载频次】269