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The enhanced catalytic decomposition behaviors of RDX by using porous activated carbon loaded with nanosized metal oxides

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Abstract

The nano-sized metal oxides (MOs) as combustion catalysts have been widely employed in solid rocket propellants, but the functionality of these materials is greatly restricted owing to their agglomeration. The catalytic activity of MOs on nanoscale was found to be significantly improved by the incorporation of MOs with carbon nanomaterials, which normally act as carriers allowing for well-distribution of MOs. In this paper, the CuO and Fe2O3 nanoparticles were produced by hydrothermal method and the CuO@C and Fe2O3@C nanocomposites with a uniform structure have been fabricated by an in-situ growth of corresponding MOs on the porous activated carbon (pAC). The morphology of the prepared MOs nanoparticles and resultant pAC carried ones were characterized using scanning electron microscope. It has been shown that the CuO and Fe2O3 nanoparticles are tightly adhered and dispersed on the surface of pAC. Their catalytic effects on the thermal decomposition of hexogen (RDX) were analyzed using thermal analysis techniques. Results indicate that the thermal decomposition of RDX was considerably promoted in the presence of these catalysts, where the CuO@C and Fe2O3@C were found to be capable of lowering the Tp for RDX by 14.8 °C and 12.4 °C, respectively. In addition, the decomposition kinetics of RDX in the presence of these catalysts have been evaluated with the DTG and DSC experimental data, and results show that the CuO@C and Fe2O3@C were able to reduce the Ea of RDX decomposition by 39.8 kJ mol−1 and 50.7 kJ mol−1, which is suggestive of an enhanced decomposition process for RDX by addition of carbon-loaded catalysts. The TG-FTIR analysis indicates that, in the presence of CuO@C and Fe2O3@C, the gaseous products are dominated by N2O in RDX decomposition.

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Acknowledgements

The author would like to acknowledge Nation Natural Science Foundation of China (51776176) and the Fundamental Research Funds for the Central Universities, China (G2017KY0301) to provide fund for conducting research.

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Authors and Affiliations

  1. Science and Technology on Combustion, Internal Flow and Thermo-Structure Laboratory, Northwestern Polytechnical University, Xi’an, 710072, China

    Hongqi Nie, Xu-Hao Yang, Su-Lan Yang & Qi-Long Yan

  2. N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, 119991, Russia

    Leonid Fershtat

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  1. Hongqi Nie
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Nie, H., Yang, XH., Yang, SL. et al. The enhanced catalytic decomposition behaviors of RDX by using porous activated carbon loaded with nanosized metal oxides. J Therm Anal Calorim 148, 4255–4266 (2023). https://doi.org/10.1007/s10973-023-11987-8

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