Scholarlink

<p>Energetic molecular perovskite DAP-4 is recognized as a promising high-energy oxidizer owing to its elevated energy content, high density, strong oxidizing potential, and straightforward synthesis. However, challenges such as optimizing its energy output and reducing both its decomposition temperature and activation energy remain significant constraints for future applications. In this paper, Uniform and porous Mn-doped Co<sub>3</sub>O<sub>4</sub> microspheres (Mn@Co<sub>3</sub>O<sub>4</sub>), composed of numerous assembled nanoparticles, were synthesized via an initial solvothermal process followed by annealing at 600&#xa0;°C in air. A comprehensive characterization was employed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) to examine the morphology and structure of DAP-4, Mn@Co<sub>3</sub>O<sub>4</sub>, and the Mn@Co<sub>3</sub>O<sub>4</sub>/DAP-4 composite. Energy-dispersive X-ray spectroscopy (EDAX) was employed to evaluate the distribution of Mn@Co<sub>3</sub>O<sub>4</sub> within the DAP-4 matrix. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were employed to evaluate the catalytic impact of Mn@Co<sub>3</sub>O<sub>4</sub> on DAP-4 decomposition. Incorporating 3 wt% Mn@Co<sub>3</sub>O<sub>4</sub> reduced the decomposition temperature of DAP-4 to 376.5&#xa0;°C and increased its decomposition enthalpy to 4650&#xa0;J/g, compared to 399&#xa0;°C and 3800&#xa0;J/g for pure DAP-4. Mn@Co<sub>3</sub>O<sub>4</sub>/DAP-4 demonstrated a highly vigorous reaction, marked by an intense flame and a rapid burn duration of just 28&#xa0;ms. Decomposition kinetics were analyzed using the Kissinger method, the Kissinger–Akahira–Sunose (KAS), and the Ozawa–Flynn–Wall (FWO) isoconversional method. Mn@Co<sub>3</sub>O<sub>4</sub>/DAP-4 exhibited a significantly lower apparent activation energy of 143.07 ± 1.44&#xa0;kJ/mol, compared to 202.7 ± 4.5&#xa0;kJ/mol for pure DAP-4. Additionally, a potential catalytic mechanism was proposed. These findings highlight a promising strategy for enhancing the applicability of DAP-4 in solid rocket propellant systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhanced thermal decomposition of energetic molecular perovskite DAP-4 using porous Mn@Co3O4 microspheres: a kinetic and mechanistic study

  • 期刊论文

  • 发表日期：

    2025年11月22日

查看全文
  • M. Yehia,
  • Shukri Ismael,
  • Sherif Elbasuney,
  • Ana Sousa-Castillo,
  • Margarita Vázquez-González,
  • Miguel A. Correa-Duarte

摘要

Energetic molecular perovskite DAP-4 is recognized as a promising high-energy oxidizer owing to its elevated energy content, high density, strong oxidizing potential, and straightforward synthesis. However, challenges such as optimizing its energy output and reducing both its decomposition temperature and activation energy remain significant constraints for future applications. In this paper, Uniform and porous Mn-doped Co3O4 microspheres (Mn@Co3O4), composed of numerous assembled nanoparticles, were synthesized via an initial solvothermal process followed by annealing at 600 °C in air. A comprehensive characterization was employed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) to examine the morphology and structure of DAP-4, Mn@Co3O4, and the Mn@Co3O4/DAP-4 composite. Energy-dispersive X-ray spectroscopy (EDAX) was employed to evaluate the distribution of Mn@Co3O4 within the DAP-4 matrix. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were employed to evaluate the catalytic impact of Mn@Co3O4 on DAP-4 decomposition. Incorporating 3 wt% Mn@Co3O4 reduced the decomposition temperature of DAP-4 to 376.5 °C and increased its decomposition enthalpy to 4650 J/g, compared to 399 °C and 3800 J/g for pure DAP-4. Mn@Co3O4/DAP-4 demonstrated a highly vigorous reaction, marked by an intense flame and a rapid burn duration of just 28 ms. Decomposition kinetics were analyzed using the Kissinger method, the Kissinger–Akahira–Sunose (KAS), and the Ozawa–Flynn–Wall (FWO) isoconversional method. Mn@Co3O4/DAP-4 exhibited a significantly lower apparent activation energy of 143.07 ± 1.44 kJ/mol, compared to 202.7 ± 4.5 kJ/mol for pure DAP-4. Additionally, a potential catalytic mechanism was proposed. These findings highlight a promising strategy for enhancing the applicability of DAP-4 in solid rocket propellant systems.