No abstract

In this study, we demonstrated that 2D MXene materials (Ti3C2) were creatively introduced into the thermal catalysis fields of high-energy-density salts dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50) and Ti3C2 MXene play a significant catalytic role in the thermal decomposition of TKX-50. Scanning electron microscopy, X-ray diffraction, and transmission electron microscope were used to characterize the morphology and structure of the Ti3C2 MXene nanosheets. Differential scanning calorimetry (DSC) was used to evaluate the thermal decomposition properites of pure TKX-50 with and without 2D Ti3C2 added. The results showed that with adding 5 wt% MXene, the peak temperature of TKX-50 was reduced from 250.5 to 233.3 °C, which was reduced by 17.2 °C. The reaction heat release was raised from 2197 to 2907 J•g-1, raised by 710 J•g-1, And the Ea was decreased by 44.8 kJ• mol-1, from 220.0 to 175.2 kJ•mol-1. What’s more, a synergistic catalytic mechanism for the thermal decomposition of TKX-50 was proposed.

No abstract

In this work, we proved that MoO3-x has a positive effect on the thermal decomposition of ammonium perchlorate based molecular perovskite (H2dabco)[NH4(ClO4)3] (DAP-4). MoO3-x was prepared by heat-treatment, and the morphology, structure and thermal decomposition performance were characterized. The morphology and structure characterization results showed that MoO3-x was an irregular layered structure material, and Mo element was mainly in the +6 chemical valence state, with a small amount of Mo5+. Thermal analysis results showed that the thermal decomposition peak temperature of DAP-4 was effectively reduced from 394.4 °C to 353.7 °C, 321.4 °C, and 312.5 °C in the presence of 1 %, 5 %, and 10 % MoO3-x, respectively. It is particularly worth noting that the maximum heat release rate of the DAP-4/10 % MoO3-x mixture was increased by 4.9 times compared with pure DAP-4. Through the two classic thermal decomposition kinetic methods, Kissinger and Starink, the reliable kinetic parameters of DAP-4/MoO3-x were obtained. The increase of the reaction rate constant k indicated that the maximum thermal decomposition reaction rate of DAP-4 was effectively improved. This work provided a feasible technology for using MoO3-x as an effective catalyst to improve the thermal performance of DAP-4.

No abstract