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Journal of Thermal Analysis and Calorimetry

, Volume 116, Issue 2, pp 1055–1060 | Cite as

Isothermal decomposition of K2C2O4

Effect of metal oxide additives on the decomposition kinetic
  • K. Muraleedharan
  • J. J. Mallikassery
  • K. Sarada
  • M. P. Kannan
Article

Abstract

The effect of semiconducting metal oxide (CuO and TiO2) additives on the kinetics of thermal decomposition of potassium oxalate (K2C2O4) to potassium carbonate has been studied at five different temperatures in the range 793–813 K under isothermal conditions by thermogravimetry (TG). The decomposition is enhanced by CuO (p-type) and suppressed by TiO2 (n-type). The diverse behaviour of K2C2O4 in the presence of different types of oxides in contrast with the like behaviour of K2C2O4 suggests the involvement of different rate determining steps in the decomposition of these solids. The TG data of 2 mass% oxide mixed samples of K2C2O4 were subjected to both model fitting and model-free (isoconversional) kinetic methods of analysis. The model fitting method of analysis shows that the rate law for the decomposition of K2C2O4 (Prout–Tompkins and contracting cylinder models, respectively, for the acceleratory and decay stages) remained unaffected by the additives.

Keywords

Contracting cylinder equation Isothermal decomposition kinetics Potassium oxalate Prout–Tompkins equation Semiconducting metal oxide additives 

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2014

Authors and Affiliations

  • K. Muraleedharan
    • 1
  • J. J. Mallikassery
    • 1
  • K. Sarada
    • 1
  • M. P. Kannan
    • 1
  1. 1.Department of ChemistryUniversity of CalicutMalappuramIndia

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