Abstract
The thermal decomposition of potassium bromate (KBrO3) has been studied as a function of particle size, in the range 53–150 μm, by isothermal thermogravimetry at different temperatures, viz. 668, 673, 678, and 683 K in static air atmosphere. The theoretical and experimental mass loss data are in good agreement for the thermal decomposition of all samples of KBrO3 at all temperatures studied. The isothermal decomposition of all samples of KBrO3 was subjected to both model fitting and model-free (isoconversional) kinetic methods of analysis. Isothermal model fitting analysis shows that the thermal decomposition kinetics of all the samples of KBrO3 studied can be best described by the contracting square equation. Contrary to the expected increase in rate followed by a decrease with decrease in particle size, KBrO3 shows a regular increase in rate with reduction in particle size, which, we suggest, is an impact of melting of this solid during decomposition.
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Notes
Contracting square and contracting cube model equations: For crystals with instantaneous nucleation over all the surface, the nucleus growth takes place inwards to the centre of the crystal and the rate will be deceleratory throughout the process as the interface area will be decreasing progressively. The growth of the product inwards is considered to take place in different manners. In contracting cube model, the inward growth of the product will be considered in the form of a cube, while in contracting square model it is considered on the basis of decreasing interfacial contact area.
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Abdul Mujeeb, V.M., Muraleedharan, K., Kannan, M.P. et al. The effect of particle size on the thermal decomposition kinetics of potassium bromate. J Therm Anal Calorim 108, 1171–1182 (2012). https://doi.org/10.1007/s10973-011-1733-0
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DOI: https://doi.org/10.1007/s10973-011-1733-0