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Catalytic action of carbon nanotubes on ammonium perchlorate thermal behavior
Reaction Kinetics, Mechanisms and Catalysis ( IF 1.8 ) Pub Date : 2020-09-04 , DOI: 10.1007/s11144-020-01848-y
Mahmoud Abdelhafiz , M. Yehia , Hosam E. Mostafa , Tamer Z. Wafy

This work focuses on the catalytic activity of ammonium perchlorate (AP) through the encapsulation technique using the single-walled carbon nanotubes (SWCNTs) and the multi-walled Carbon Nanotubes (MWCNTs). Encapsulation process took place utilizing a revised approach of the fast-crash solvent–antisolvent method. Particle shape and size were characterized using EDX and SEM, while the thermal behavior of AP/SWCNTs and AP/MWCNTs composite particles was evaluated using DSC together with TGA. The TGA data were applied for quantifying the AP activation energy using the Kissinger method and was confirmed through the Kissinger–Akahira–Sunose (KAS) method. The obtained encapsulated AP showed a significant reduction in the decomposition temperature and a major increase in the overall heat release of AP. Also, kinetics study data showed that encapsulated AP possessed lower activation energy in comparison to that of the pure AP. These results established that carbon nanotubes (CNTs) could be a promising innovative catalyst that has a straightforward impact on the ammonium perchlorate thermal activity, thus affects the thermal behavior and performance of the rocket propellant formulations.



中文翻译:

碳纳米管对高氯酸铵热行为的催化作用

这项工作的重点是通过使用单壁碳纳米管(SWCNT)和多壁碳纳米管(MWCNT)的封装技术,实现高氯酸铵(AP)的催化活性。封装过程是使用快速碰撞溶剂-反溶剂方法的修订方法进行的。使用EDX和SEM表征了颗粒的形状和尺寸,同时使用DSC和TGA评估了AP / SWCNTs和AP / MWCNTs复合颗粒的热行为。TGA数据通过基辛格方法应用于量化AP活化能,并通过基辛格-赤平-Sunose(KAS)方法得到证实。所获得的封装的AP显示出分解温度的显着降低并且AP的总体放热的显着增加。也,动力学研究数据表明,与纯AP相比,包封的AP具有较低的活化能。这些结果表明,碳纳米管(CNTs)可能是一种有前途的创新催化剂,它对高氯酸铵的热活性具有直接的影响,从而影响了火箭推进剂配方的热性能和性能。

更新日期:2020-09-05
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