草酸亚铁在氩气中的热分解机理和动力学研究

Kinetics of Thermal Decomposition of FeC_2O_4·2H_2O in Ar

用热分析(TG/DTG/DTA)、X射线衍射(XRD)技术研究了固态物质FeC2O4.2H2O在氩气中热分解的过程.热分析结果表明,FeC2O4.2H2O在氩气中分两步分解,其失重率与理论计算失重率相吻合.XRD结果表明FeC2O4.2H2O分解产物为Fe3O4.用Friedman法和Flynn-Wall-Ozawa(FWO)法求取了分解过程的活化能,并用多元线性回归法给出了可能的机理函数,由这些方法得到的动力学数据相互比较吻合.

The thermal decomposition processes taking place in the solid state FeC2O4·2H2O have been studied in Ar using thermogravimetry/differential thermogravimetry/differential thermal analysis （TG/ DTG/DTA） and XRD techniques. TG/DTG/DTA curves show that the decomposition proceeds through two well-defined steps in At. Mass loss of the thermal decomposition of FeC2O4·2H2O is in good agreement with the theoretical mass loss. X-ray diffraction（XRD） showed that the final product of the thermal decomposition was Fea 04. The activation energies were calculated through the Friedman and Flynn-Wall- Ozawa （FWO） methods, and the possible conversion functions had been estimated through the multiple linear regression method and the multiple non-linear regression method respectively.