Study on dehydrogenation and oxidation kinetics mechanisms of micron α-AlH3 in an oxidative atmosphere

Li, Heping; Liang, Daolun; Yu, Minghui; Liu, Jianzhong; Wang, Yang; Pang, Aimin; Tang, Gen; Huang, Xuefeng

doi:10.1016/j.ijhydene.2020.06.124

Cited by 33 publications

(11 citation statements)

References 21 publications

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“…Moreover, the oxidized surface of AHNP is rough and with concave areas. It is worth celebrating that Li et al's characterization of AlH 3 samples found that there is a discontinuous oxide layer composed of block or rod‐shaped Al 2 O 3 on its surface 47 . This is very similar to our simulation results.…”

Section: Resultssupporting

confidence: 89%

“…It is worth celebrating that Li et al's characterization of AlH 3 samples found that there is a discontinuous oxide layer composed of block or rod-shaped Al 2 O 3 on its surface. 47 This is very similar to our simulation results. The inhomogeneous oxidation distribution resulted in the in concentration of stress in the oxidation process of AHNP (Al O phase and Al H phase exist simultaneously).…”

Section: Simulation Detailssupporting

confidence: 92%

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Atomic insights into combustion mechanism of nano‐aluminum hydride

Zhao

Mei

et al. 2022

Intl J of Energy Research

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Section: Resultssupporting

confidence: 89%

Section: Simulation Detailssupporting

confidence: 92%

Atomic insights into combustion mechanism of nano‐aluminum hydride

Zhao

Mei

et al. 2022

Intl J of Energy Research

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“…Obviously, apart from the signal of Al, AlCl 3 , and AP, an additional AlF 3 was found (Figure a). In particular, there was only Al existing at 200 °C, which corresponded to the decomposition of AlH 3 . As the temperature increased, AlF 3 and AlCl 3 gradually appeared in the products, thereby indicating that the dehydrogenated Al could react with the substances produced by the decomposition of PFPE and AP .…”

Section: Resultsmentioning

confidence: 97%

“…In particular, there was only Al existing at 200 °C, which corresponded to the decomposition of AlH 3 . 45 As the temperature increased, AlF 3 and AlCl 3 gradually appeared in the products, thereby indicating that the dehydrogenated Al could react with the substances produced by the decomposition of PFPE and AP. 46 Moreover, the SEM-EDS images indicate that the release of H 2 could form the porous structure (Figure 9b).…”

mentioning

confidence: 97%

Stabilization of AlH₃ Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

Yang

Xie³

et al. 2023

Langmuir

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Aluminum hydride (AlH 3 ) is a promising fuel component of solid propellant, but its stabilization is still challenging. Herein, surface functionalization of hydrophobic perfluoropolyether (PFPE) followed by ammonium perchlorate (AP) coating has been implemented. In particular, AlH 3 @PFPE@xAP (x = 10, 30, 50, or 64.21%) composites (AHFPs) were prepared by a spraydrying technique. The PFPE-functionalized AlH 3 with a hydrophobic surface shows an increased water contact angle (WCA) from 51.87°to 113.54°. Compared with pure AlH 3 , the initial decomposition temperatures of AHFPs were increased by 17 °C, and the decomposition properties of AP in the AHFPs were also enhanced with significantly decreased peak temperature and fairly increased energy output. Moreover, the decomposition induction time of AHFPs-30% was improved by almost 1.82 times that of raw AlH 3 , which indicates that the coatings of PFPE and AP could improve the stability of AlH 3 . The maximum flame radiation intensity of AHFPs-30% was 21.6 × 10 3 , which is almost 7.71 times that of pure AlH 3 (2.8 × 10 3 ).

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“…14,19−22 The reason is that the less stability and poor compatibility of AlH 3 limit its application in propellants, which results in spontaneous decomposition and failure of the propellants. 19 Much effort has been made to solve these problems, including coating, passivation, doping, and optimization of synthesis conditions to obtain better crystal quality. 7,23−26 Moreover, the structures with defects and cracks will promote the formation of hydrogen vacancies, and these vacancies are the source of Al-phase nucleation sites that accelerate the decomposition reaction of AlH 3 .…”

Section: ■ Introductionmentioning

confidence: 99%

High-Energy Composite Fuels with Improved Combustion Efficiency by Using AlH₃ Embedded with Al Particles

Yu,

Xu,

Xie

et al. 2023

ACS Appl. Mater. Interfaces

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Aluminum hydride (AlH3) has attracted much attention due to its potential to replace aluminum (Al) as a novel energetic material in solid propellants. In this research, ammonium perchlorate (AP) and perfluoropolyether (PFPE) as functionalized coatings and a combination of acoustic resonance and spray drying technology have been employed to prepare AlH3@Al@AP (AHAPs) and AlH3@Al@AP@PFPE (AHAPs-F) energetic composite particles. The formulations of composite propellants and modified AlH3 particles were designed and fabricated. Their thermal reactivity, reaction heat, density, vacuum stability, combustion performance, and condensed combustion products (CCPs) have been systematically investigated. The results show that the solid propellants containing AHAPs (SP13) and AHAPs-F (SP14) composites can significantly enhance the reactivity and energy output compared to conventional solid propellants with the mechanical mixture Al/AlH3 (SP12). In particular, the total heat releases of SP13 and SP14 are almost 1.2 and 1.7 times higher than those of conventional ones (SP12, 1442 J g–1), respectively. Among the AlH3-based propellants, SP14 propellants exhibit the highest reaction heat of 5887 J g–1, the most intensive flame radiation of 31.4 × 103, and the highest combustion wave temperature of 2495 °C. Moreover, the particle size distribution of CCPs from SP14 propellants is much narrower and smaller than that of SP12, resulting in higher combustion efficiency.

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Study on dehydrogenation and oxidation kinetics mechanisms of micron α-AlH3 in an oxidative atmosphere

Cited by 33 publications

References 21 publications

Atomic insights into combustion mechanism of nano‐aluminum hydride

Atomic insights into combustion mechanism of nano‐aluminum hydride

Stabilization of AlH₃ Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

High-Energy Composite Fuels with Improved Combustion Efficiency by Using AlH₃ Embedded with Al Particles

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Study on dehydrogenation and oxidation kinetics mechanisms of micron α-AlH3 in an oxidative atmosphere

Cited by 33 publications

References 21 publications

Atomic insights into combustion mechanism of nano‐aluminum hydride

Atomic insights into combustion mechanism of nano‐aluminum hydride

Stabilization of AlH3 Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

High-Energy Composite Fuels with Improved Combustion Efficiency by Using AlH3 Embedded with Al Particles

Contact Info

Product

Resources

About

Stabilization of AlH₃ Crystals by the Coating of Hydrophobic PFPE and Resulted Reactivity with Ammonium Perchlorate

High-Energy Composite Fuels with Improved Combustion Efficiency by Using AlH₃ Embedded with Al Particles