配合物K_3〔Al(C_2O_4)_3〕·3H_2O与K_3〔Cr(C_2O_4)_3〕·3H_2O的热分解反应及其动力学研究

Study on the Thermal Decomposition and Its Kinetics of K_3(Al(C_2O_4)_3)·3H_2O and K_3(Cr(C_2O_4)_3)·3H_2O

采用TG-DSC方法研究了K3〔Al(C2O4)3〕.3H2O与K3〔Cr(C2O4)3〕.3H2O两个配合物的热分解反应过程,对其中部分热解过程进行了动力学计算.由Friedman、Ozawa-Flynn-Wall、ASTME698三种方法得出峰温时的活化能值与指前因子值.应用Achar方法计算拟合得到了比较合理的机理函数.

The thermal decomposition reactions and its kinetic evaluation of the complexes K3[Al（C2O4）3]·3H2O and K3[Cr（C2O4）3]·3H2O has been investigated by TG - DSC methods. The decomposition reaction parameters lgA and Ea （kJ.mol^-1） of all steps of K3[Al（C2O4）3] andtwo steps of K3[Cr（C2O4）3] ·3H2O were evaluated by Friedman. Ozawa - Flynn - Wall、ASTME698 methods and their optimally kinetic function were fitted by Achar method, they were belong to Bna.