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The influence of dissociation reaction on ammonium nitrate thermal decomposition reaction

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Abstract

In order to investigate the influence of dissociation reaction on thermal decomposition of ammonium nitrate (AN), biochar was selected as an adsorbent to interfere with the dissociation of AN. The TG-DSC results showed that the notable exothermic reaction of AN with the presence of 2% or 7% biochar took place. The decomposition temperature of AN decreased with increasing amount of biochar. The notable knee point was found in the TG curves. The activation energy of AN with biochar in the initial stage was higher than that of AN itself. Remote sensing Fourier transform infrared experiments found biochar induced AN decomposition at about 190 °C, which was also confirmed by the TG-MS results. After dissociation reaction, HNO3 (g) and NH3 (g) were adsorbed and crystalline of AN was formed on the surface of biochar. With the increasing temperature, NH3 escaped from the surface of biochar, while HNO3 (g) was stayed in biochar. HNO3 (g) catalyzed the thermal decomposition of AN and also reacted with biochar. The results indicated that dissociation reaction of AN played an important role during AN thermal decomposition process. When dissociation reaction was changed, the thermal decomposition reaction of AN would also change, catalysis or inhibition AN thermal decomposition. It is a useful reference to guide the AN additives selection and to understand the mechanism for the AN decomposition accident.

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Acknowledgements

This paper was supported by the Foundation of Jiangsu University of Advanced scholars (15JDG159) and the Natural Science Foundation of Jiangsu Colleges and Universities (16KJB150010).

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Authors and Affiliations

  1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China

    Zhi-Xiang Xu, Jin-Hong Cheng & Qian Wang

  2. Department of Safety Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China

    Jian Cheng

  3. School Materials Science and Engineering, University of Jinan, Jinan, 250022, China

    Xun Hu

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  1. Zhi-Xiang Xu
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  2. Jin-Hong Cheng
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  3. Qian Wang
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  4. Jian Cheng
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Correspondence to Zhi-Xiang Xu or Xun Hu.

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Xu, ZX., Cheng, JH., Wang, Q. et al. The influence of dissociation reaction on ammonium nitrate thermal decomposition reaction. J Therm Anal Calorim 136, 1415–1424 (2019). https://doi.org/10.1007/s10973-018-7808-4

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  • DOI: https://doi.org/10.1007/s10973-018-7808-4

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