Catalytic effect of Mn particle size on thermal decomposition of sodium chlorate in oxygen generators

LIU Jian-guo; JIN Long-zhe; GAO Na; WANG Shu; ZHANG Hao

doi:10.13374/j.issn2095-9389.2017.08.004

Volume 39 Issue 8

Aug. 2017

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LIU Jian-guo, JIN Long-zhe, GAO Na, WANG Shu, ZHANG Hao. Catalytic effect of Mn particle size on thermal decomposition of sodium chlorate in oxygen generators[J]. Chinese Journal of Engineering, 2017, 39(8): 1159-1165. doi: 10.13374/j.issn2095-9389.2017.08.004

Citation:

LIU Jian-guo, JIN Long-zhe, GAO Na, WANG Shu, ZHANG Hao. Catalytic effect of Mn particle size on thermal decomposition of sodium chlorate in oxygen generators[J]. Chinese Journal of Engineering, 2017, 39(8): 1159-1165. doi: 10.13374/j.issn2095-9389.2017.08.004

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Catalytic effect of Mn particle size on thermal decomposition of sodium chlorate in oxygen generators

doi: 10.13374/j.issn2095-9389.2017.08.004

LIU Jian-guo^1,2,3,
JIN Long-zhe^1,2,3,
GAO Na^{1,2,3
,
,},
WANG Shu^1,2,3,
ZHANG Hao^1,2,3

1) School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2) Key Laboratory of Ministry of Education for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China
3) Mine Emergency Technology Research Center, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2017-03-09

Abstract

Abstract

Two groups of Mn metal fuels with different particle-size distributions were prepared with median diameters of 18.73 and 5.24 μm. The particle-size distribution was measured by a laser particle-size analyzer, the surface morphology was analyzed via scanning electron microscopy (SEM), and energy dispersive spectrometry (EDS) determined the contained elements. For the NaClO₃, the NaClO₃ and Co₃O₄ as well as NaClO₃, Co₃O₄, and Mn mixtures were subjected to TGA-DSC combined thermogravimetric analysis. The effects of the Mn metal fuel particle size on the catalytic effect and pyrolysis stability of NaClO₃ were investigated by comparing the pyrolysis onset/final temperature and other characteristics. The results show that although Co₃O₄ has a significant catalytic effect on the pyrolysis of NaClO₃, e.g., the onset pyrolysis temperature decreases from 512.3 to 333.0℃, it can lead to instability in NaClO₃ pyrolysis, namely the pyrolysis steps from 1 to 3. The Mn metal fuel has a clear catalysis effect on the intermediate products of NaClO₃ pyrolysis. With the decrease in particle size, the catalytic effect gradually increases and the pyrolysis final temperature T_f decreases from 419.8 to 351.9℃. Meanwhile, the pyrolysis step of NaClO₃ decreases and the temperature range of pyrolysis decreases from 180.6 to 19.4℃, indicating that the pyrolysis process becomes more stable.
- oxygen generator,
- metal fuel,
- particle size,
- sodium chlorate,
- thermal decomposition

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References(22)

References

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