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采用热分析(TG-DTA/DTG)、X射线衍射(XRD)研究了固态物质NH4Al(SO4)2.12H2O在氩气中的热分解过程。热分析结果表明,NH4Al(SO4)2.12H2O在氩气中分5步分解,其质量变化率与理论计算相吻合。XRD结果表明,NH4Al(SO4)2.12H2O热分解的最终产物为Al2O3。用Friedman法对各步分解过程的活化能Ea进行了计算,依此为初始值,采用多元非线性回归法得到各个分解步骤可能的动力学模型和参数。
Thermal decomposition (TG-DTA / DTG) and X-ray diffraction (XRD) were used to study the thermal decomposition of NH4Al (SO4) 2.12H2O in argon. The results of thermal analysis show that NH4Al (SO4) 2.12H2O decomposes in 5 steps in argon, and its mass change rate is consistent with the theoretical calculation. XRD results show that the final product of thermal decomposition of NH4Al (SO4) 2.12H2O is Al2O3. The activation energy Ea of each step decomposition process was calculated by Friedman method. Based on this, the activation energy Ea was calculated as the initial value, and the possible kinetic models and parameters of each decomposition step were obtained by multivariate nonlinear regression method.