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Effect of metals and Co3O4 on the thermal decomposition reaction of sodium chlorate in an area of refuge

Na Gao, Ya-qing Dai, Long-zhe Jin, Chun-guo Ma, Jian-guo Liu, Zhao Wang, and Kariman Kaeryaer

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, China

 

E-mail: dyq961207@163.com

Received: 15 November 2019  Accepted: 2 May 2020

Abstract:

Sodium chlorate (NaClO3) is suitable for use in an area of refuge as the backup chemical oxygen source. To explore the catalytic mechanism of metals and Co3O4 on NaClO3, the addition amount was studied. In this research, 18 samples were prepared by adding different concentrations of Fe, Mg, and Mn (2%, 4%, 6%, and 8%) with Co3O4 (2%, 3%, 4%, 5%, and 6%), and some thermogravimetric experiments were conducted. The results show that the initial decomposition temperature of NaClO3 is reduced from 522 to 255–270 °C by Co3O4. There are two stages in the decomposition process of NaClO3 under the catalytic effect of Co3O4. The catalytic effect of 5% Co3O4 on NaClO3 decomposition is the greatest among the tested amounts. In addition, the proportion of metals has little effect on the initial decomposition temperature of NaClO3 when 5% Co3O4 is added, but NaClO3 has better oxygen performance when the mass fraction of metals is 4–8%. The highly active Mg destabilizes the decomposition of NaClO3, and Mn is more suitable than Mg/Fe for addition into NaClO3. The above conclusions help improve the oxygen supply application of NaClO3 in an area of refuge.

Keywords: Thermogravimetric analysis; Chemical oxygen supply; NaClO3; Metal; Co3O4

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01186-2

 

Chemical Papers 74 (10) 3475–3480 (2020)

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