ABSTRACT

The effects of copper oxide compound catalyst (Cu-O) on various stages of ammonium perchlorate (AP) thermal decomposition were investigated by TG. The results show that the thermal decomposition rate at the low-temperature section increases and the temperature at the maximum thermal decomposition rate (T_m) appears at 571 K when the Cu-O catalyst was added. The T_m at the high-temperature section is reduced from 660 K to 606 K. The thermal decomposition activation energy (E_a) of the whole process shows that the E_a of pure AP is significantly higher than that of AP+Cu-O when α > 0.25. According to the Gaussian peak-fit, the thermal decomposition of pure AP and AP+Cu-O can be divided into four stages. The E_a of each stage shows that the Cu-O catalyst has a significant catalytic effect on the first three stages of AP thermal decomposition, but has almost no catalytic effect on the fourth stage. According to the Coats-Redfern (CR) and masterplot method, the four stages of pure AP and AP+Cu-O are consistent with the n-order reaction F model and the Avrami-Eroféev (AE) model. Finally, the mechanism function reconstruction of four stages for pure AP and AP+Cu-O is completed by Arrhenius equation and kinetics compensation effect.

摘要

通过TG研究了氧化铜化合物催化剂（Cu-O）对高氯酸铵（AP）热分解各个阶段的影响。结果表明，在低温部的增加的热分解速率和最大热分解速率（温度Ť_米中加入在Cu-O催化剂时）出现在571ķ。高温段的T _m从 660 K 降低到 606 K。整个过程的热分解活化能（E _a）表明E _a当 α > 0.25 时，纯 AP 的显着高于 AP+Cu-O。根据高斯峰拟合，纯AP和AP+Cu-O的热分解可分为四个阶段。各阶段的E _a表明Cu-O催化剂对AP热分解的前三个阶段有显着的催化作用，而对第四阶段几乎没有催化作用。根据 Coats-Redfern (CR) 和 masterplot 方法，纯 AP 和 AP+Cu-O 的四个阶段与 n 级反应 F 模型和 Avrami-Eroféev (AE) 模型一致。最后，通过Arrhenius方程和动力学补偿效应完成了纯AP和AP+Cu-O四个阶段的机理函数重构。