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Vol. 25 No. 7 (2013): Vol 25 Issue 7

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Kinetic Studies of the Non-Isothermal Decomposition of Strontium Nitrate

https://doi.org/10.14233/ajchem.2013.13820
Sunil Culas
Department of Chemistry, Mar Ivanios College, Thiruvananthapuram-695 015, India
Athira Surendran
Department of Chemistry, Mar Ivanios College, Thiruvananthapuram-695 015, India
Jadu Samuel
Department of Chemistry, Mar Ivanios College, Thiruvananthapuram-695 015, India

Corresponding Author(s) : Jadu Samuel

prof_jadu@hotmail.com

Asian Journal of Chemistry, Vol. 25 No. 7 (2013): Vol 25 Issue 7

Abstract

The thermal decomposition kinetics of strontium nitrate, Sr(NO3)2 was studied by thermogravimetry using non-isothermal experiments. For the kinetic analysis, the TG/DTG data obtained in the temperature range 30-850 ºC at different heating rates (5, 10, 15 and 20 K/min) in the nitrogen atmosphere were processed by model fitting and model free methods. The thermal decomposition of Sr(NO3)2 occurred in a single stage without the formation of intermediate nitrite. The average apparent activation energies of thermal decomposition of Sr(NO3)2 as determined by Straink, Flynn-Wall-Ozawa, KAS and Friedman methods are 344.37, 341.39, 344.05 and 362.62 kJ/mol, respectively. The value of the invariant activation energy (344.83 kJ/ mol) obtained by Invariant kinetic parameter method is in a good agreement with integral isoconversional methods. The appropriate conversion model of the process selected by means of the master plot method is "Diffusion model (D4)".

Keywords

Kinetics Non-isothermal decomposition Strontium nitrate
Culas, S., Surendran, A., & Samuel, J. (2013). Kinetic Studies of the Non-Isothermal Decomposition of Strontium Nitrate. Asian Journal of Chemistry, 25(7), 3855–3859. https://doi.org/10.14233/ajchem.2013.13820
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