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Kinetics of thermal decomposition of a synthetic K–H3O jarosite analog

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Abstract

The thermal decomposition kinetics of a synthetic K–H3O jarosite analog was determined from thermogravimetric analysis at various heating rates in air. A thermal decomposition mechanism was proposed based on X-ray analysis of partially decomposed material and distinct features observed during thermal decomposition analysis. The decomposition path is complex. The material was treated as a composite of K-jarosite, H3O-jarosite, and a “vacancy component”. The evolution of (OH)− and SO3 from these individual components was modeled. The decomposition is broken into subreactions according to distinct features in the thermoanalytical measurements. The subreactions are arranged sequentially and in parallel according to the evolution of the participating phases. A set of associated apparent activation energies was determined using isoconversion analysis. Kinetic triplets were assigned to each subreaction. A reasonable match with the observed decomposition was achieved by varying pre-exponential factors.

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Acknowledgements

This work was supported by the Defense Threat Reduction Agency.

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Authors and Affiliations

  1. Otto H. York Department of Chemical, Biological, and Pharmaceutical Engineering, New Jersey Institute of Technology, 138 Warren Street, Newark, NJ, 07102, USA

    Shashank Vummidi Lakshman, Salil Mohan, Edward L. Dreizin & Mirko Schoenitz

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  1. Shashank Vummidi Lakshman
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  2. Salil Mohan
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  3. Edward L. Dreizin
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  4. Mirko Schoenitz
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Correspondence to Shashank Vummidi Lakshman.

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Vummidi Lakshman, S., Mohan, S., Dreizin, E.L. et al. Kinetics of thermal decomposition of a synthetic K–H3O jarosite analog. J Therm Anal Calorim 115, 609–620 (2014). https://doi.org/10.1007/s10973-013-3295-9

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  • DOI: https://doi.org/10.1007/s10973-013-3295-9

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