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Non-isothermal Studies on Mechanism And Kinetics of Thermal Decomposition of Cobalt(II) Oxalate Dihydrate

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Abstract

Thermal decomposition of CoC2O4⋅2H2O was studied using DTA, TG, QMS and XRD techniques. It was shown that decomposition generally occurs in two steps: dehydration to anhydrous oxalate and next decomposition to Co and to CoO in two parallel reactions. Two parallel reactions were distinguished using mass spectra data of gaseous products of decomposition. Both reactions run according toAvrami–Erofeev equation. For reaction going to metallic cobalt parameter n=2 and activation energy is 97±14 kJ mol–1. It was found that decomposition to CoO proceeds in two stages. First stage (0.12<αII<0.41) proceeds according to n=2, with activation energy 251±15 kJ mol–1 and second stage (0.45<αII<0.85) proceeds according to parameter n=1 and activation energy 203±21 kJ mol–1.

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Authors and Affiliations

  1. Faculty of Materials Science and Ceramics, Department of Inorganic Chemistry, University of Mining and Metallurgy, Mickiewicz Av. 30, 30-059, Cracow, Poland

    B. Małecka, E. Drożdż-Cieśla & A. Małecki

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  1. B. Małecka
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  2. E. Drożdż-Cieśla
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  3. A. Małecki
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Małecka, B., Drożdż-Cieśla, E. & Małecki, A. Non-isothermal Studies on Mechanism And Kinetics of Thermal Decomposition of Cobalt(II) Oxalate Dihydrate. Journal of Thermal Analysis and Calorimetry 68, 819–831 (2002). https://doi.org/10.1023/A:1016117901074

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