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Insight into the catalytic thermal decomposition mechanism of ammonium perchlorate

TG-MS study using cotton-assisted hydrothermally synthesized nano copper oxide catalyst
  • Deepthi L. SivadasEmail author
  • Deepthi Thomas
  • M. S. Haseena
  • T. Jayalatha
  • G. Rekha Krishnan
  • Salu Jacob
  • R. Rajeev
Article
  • 14 Downloads

Abstract

Copper oxide (CuO) is an attractive burn rate modifier for composite solid propellant based on ammonium perchlorate (AP). However, the mechanism of catalytic decomposition of AP in the presence of CuO is still uncertain. Amount of gaseous products at various decomposition temperatures of AP in the presence and absence of CuO is lacking. Herein, a systematic study using thermogravimetry-mass spectroscopy (TG-MS) was carried out to evaluate the effect of CuO on AP decomposition mechanism. A novel hydrothermal method was reported for the preparation of nanosized copper oxide. The conversion of precursor Cu(NO3)2·3H2O to intermediate Cu2(NO3)(OH)3 was accomplished by in situ carbonization of small quantity of cotton fiber in the hydrothermal reaction chamber. pH of the reaction medium was controlled by utilizing the nitric acid in the reaction medium by in situ carbonization of cotton. This synthetic method aimed to minimize the shape-controlling agents and strong alkali for controlling the pH of the reaction medium for the preparation of catalyst grade CuO. Evolved gas analysis of AP decomposition products by TG-MS showed increased oxygen, chlorine and nitrogen evolution and decreased ammonia evolution in the presence of CuO, compared with that of AP without catalyst. This confirmed the enhanced interaction of ammonia and perchloric acid; the initial decomposition products of AP; and their further reaction in the presence of CuO. The change in composition of volatile products indicates change in mechanism of AP decomposition from proton transfer to electron transfer in the presence of CuO.

Graphical abstract

Keywords

Copper oxide Hydrothermal Ammonium perchlorate Burn rate modifier TG-MS 

Notes

Acknowledgements

Authors acknowledge Director, VSSC, for the fund.

Supplementary material

10973_2019_8209_MOESM1_ESM.docx (31 kb)
Supplementary material 1 (DOCX 31 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Deepthi L. Sivadas
    • 1
    Email author
  • Deepthi Thomas
    • 1
  • M. S. Haseena
    • 1
  • T. Jayalatha
    • 1
  • G. Rekha Krishnan
    • 1
  • Salu Jacob
    • 1
  • R. Rajeev
    • 1
  1. 1.Analytical and Spectroscopy DivisionVikram Sarabhai Space CentreThiruvananthapuramIndia

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