Thermal Decomposition Mechanism of Ammonium Nitrate on the Main Crystal Surface of Ferric Oxide: Experimental and Theoretical Studies

Langmuir, Год журнала: 2024, Номер 40(4), С. 2198 - 2209

Опубликована: Янв. 19, 2024

Understanding the decomposition process of ammonium nitrate (AN) on catalyst surfaces is crucial for development practical and efficient catalysts in AN-based propellants. In this study, two types nano-Fe2O3 were synthesized: spherical particles with high-exposure (104) facets flaky (110) facets. Through thermal analysis particle size analysis, it was found that nanosheet-Fe2O3 achieved more complete AN despite having a larger average compared to nanosphere-Fe2O3. Subsequently, effects pyrolysis investigated by theoretical simulations. studying interaction between crystal facets, determined electron transfer efficiency facet stronger facet. Additionally, free-energy step diagrams reaction molecule calculated DFT + U method. Comparative led us conclude α-Fe2O3 favorable Our study seeks deepen understanding mechanism underlying present new ideas effective pyrolysis.

Язык: Английский

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Nitrogen‐doped reduced graphene oxide/Fe₂O₃ hybrid as efficient catalyst for ammonium nitrate

Propellants Explosives Pyrotechnics, Год журнала: 2024, Номер 49(5)

Опубликована: Апрель 17, 2024

Abstract In this investigation, we successfully synthesized a hybrid material, N‐rGO@Fe 2 O 3 , via one‐step hydrothermal process, comprising nitrogen‐doped reduced graphene oxide and α‐Fe . Thorough characterization using diverse analytical methods validated its structure. Employing composite as catalyst, studied efficacy in the catalytic thermal decomposition of ammonium nitrate (AN). The /AN was prepared recurrent spray coating method with % mass material. Thermo‐gravimetric (TG) differential scanning calorimetric (DSC) analyses were employed to investigate effect. Computational assessment Arrhenius parameters conducted through isoconversional kinetic approaches. Results from analysis allowed determination critical ignition temperature. Furthermore, calorific values for pure AN measured an oxygen bombe, revealing 41 reduction activation energy barrier lowering temperature 292 °C 283 upon incorporation Notably, surface modification resulted increase 1440 J/g observed values. These findings highlight potential effective offering promising implications applications enhancing decomposition.

Язык: Английский

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Exploring the Synergistic Promoting Effect of Core-shell Energetic Composite EC-Pb@CA on Ammonium Perchlorate Thermolysis

Journal of Analytical and Applied Pyrolysis, Год журнала: 2025, Номер unknown, С. 106960 - 106960

Опубликована: Янв. 1, 2025

Язык: Английский

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Synergistic effect of AP/KP composite oxidizers prepared by electrostatic spraying and promotion of aluminum combustion performance

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Март 17, 2025

In order to solve the problems of low effective oxygen content, density and high mechanical sensibility ammonium perchlorate (AP) for propellant, potassium (KP), which has a higher greater was introduced. An AP/KP composite oxidizer prepared using electrostatic spraying. The morphology, structure, thermal properties, safety, combustion performance samples were characterized scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), diffraction (XRD), quadruple coupling technique (TG-DSC-FTIR-MS). Comparative studies performed with raw materials physically mixed samples. results indicate that crystal structures AP KP remained unchanged in oxidizers different methods. spray exhibited significantly improved safety compared samples, friction sensitivity reduced by 36% 16%, respectively. Thermal analysis revealed enhanced high-temperature decomposition KP, peaks 49.15 °C 9.67 °C, Additionally, method activation energy KP's from 448.32 440.62 kJ·mol− 1 222.80–226.11 1. Compared spraying ignition delay time oxidizer, increased aluminum powder rate, enabled complete Al powder. method, its adjustable process parameters controllable sample enhances overall oxidizer.

Язык: Английский

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Solar light-responsive g-C₃N₄ and Ni₁₋ₓMnₓCo₂₋ᵧFeᵧO₄ Composites for Rapid Dye Degradation and Phytotoxicity Evaluation

Environmental Technology & Innovation, Год журнала: 2025, Номер unknown, С. 104254 - 104254

Опубликована: Май 1, 2025

Язык: Английский

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Enhancing the combustion and safety performance of Al@AP Core-Shell structures with boron nitride

Fuel Processing Technology, Год журнала: 2025, Номер 274, С. 108253 - 108253

Опубликована: Май 27, 2025

Язык: Английский

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Preparation of MXene-type C-TiO2 nanocatalysts for enhancing the combustion performance of AP/HTPB propellants

Journal of Alloys and Compounds, Год журнала: 2024, Номер 995, С. 174795 - 174795

Опубликована: Май 11, 2024

Язык: Английский

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Enhanced catalytic influence of carbon-supported Ti/Co bimetallic oxide nanocomposites on combustion of AP/HTPB propellants

Vacuum, Год журнала: 2024, Номер 228, С. 113495 - 113495

Опубликована: Июль 22, 2024

Язык: Английский

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Effect of amine-based burning rate suppressants on the HTPB propellants: Thermal decomposition and combustion characteristics

Acta Astronautica, Год журнала: 2024, Номер 219, С. 497 - 505

Опубликована: Март 26, 2024

Язык: Английский

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Efficient Construction of MXene/V₂O₅ Nanocomposites for Optimizing the Combustion of Ammonium Perchlorate-Based Composite Solid Propellants

Langmuir, Год журнала: 2023, Номер 39(26), С. 9162 - 9171

Опубликована: Июнь 21, 2023

The combustion performance of composite solid propellants (CSPs) significantly affects their application in the field military and civil aircraft. Ammonium perchlorate/hydroxyl-terminated polybutadiene (AP/HTPB) are one common CSPs, is mainly affected by AP thermal decomposition. In this work, a simple strategy was put forward to effectively construct MXene-supported vanadium pentoxide nanocomposites (MXene/V2O5, MXV). MXene provided good loading interface for V2O5 nanoparticles, which made MXV obtain large specific surface area simultaneously improved catalytic experiment results showed that decomposition temperature mixed with (MXV-4, 2.0 wt %) 83.4 °C lower than pure AP. Moreover, ignition delay AP/HTPB propellant reduced 80.4% after adding MXV-4. burning rate also increased 202% under action Based on above results, MXV-4 expected be an additive optimizing process AP-based propellants.

Язык: Английский

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