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

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

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

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 SO 3 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.

Original languageEnglish (US)
Pages (from-to)609-620
Number of pages12
JournalJournal of Thermal Analysis and Calorimetry
Volume115
Issue number1
DOIs
StatePublished - Jan 2014

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Keywords

  • Isoconversion
  • K-HO jarosite
  • Kinetics
  • Reaction mechanism
  • Thermal decomposition
  • Thermal witness material

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