Kinetics Model Reconstruction for Multistep Overlapping Thermal Decomposition of Ammonium Perchlorate with and without the Copper Oxide Compound Catalyst

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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 (Tm ) appears at 571 K when the Cu-O catalyst was added. The Tm at the high-temperature section is reduced from 660 K to 606 K. The thermal decomposition activation energy (Ea ) of the whole process shows that the Ea 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 Ea 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.

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