Combustion Mechanism of a Novel Energetic Fuel Candidate Based on Amine Metal Borohydrides

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• 作者：Xuefeng Huang ; Shengji Li ; Xiongfei Zheng ; Shu Yang ; Yanhui Guo
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：February 18, 2016
• 年：2016
• 卷：30
• 期：2
• 页码：1383-1389
• 全文大小：445K
• ISSN：1520-5029

文摘

During the past few decades, a variety of novel hydrogen-enriched boron–nitrogen–hydrogen (BNH) materials have been developed as prospective hydrogen storage candidates. Owing to their unique composition and properties, it has recently been realized and suggested that BNH materials may be potential solid propellants and additives applied in solid and hybrid rockets. Amine metal borohydride is a novel BNH hydrogen storage system with promising properties. To investigate its potential as a solid propellant, the combustion properties of two newly developed ethylene diamine aluminum borohydrides (Al(BH₄)₃·nEDA, n = 3, 2) were studied. These materials were revealed to have high combustion heat of 32.20 and 36.90 MJ/kg for Al(BH₄)₃·3EDA and Al(BH₄)₃·2EDA, respectively. Their ignition delay time is ∼2.0 ms. Meanwhile, their combustion products mainly compose of CO₂ and H₂O without NO₂, which exhibit less-toxic performance as propellants and additives for rockets. Furthermore, according to a combination of measurements, including thermogravimetry/mass spectrometer, Fourier transform infrared spectroscopy, and X-ray diffraction, a combustion mechanism was studied and proposed. It is suggested that the combustion of Al(BH₄)₃·nEDA (n = 3, 2) may undergo three sequential stages of dehydrogenation, combustion of hydrogen and impurities, and combustion of the dehydrogenated framework.