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Kinetic study of dipivaloylmethane by ozawa method

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Abstract

The lanthanidic complexes of general formula Ln(C11H19O2)3 were synthesized and characterized by elementary analysis, infrared absorption espectroscopy, thermogravimetry (TG) and differential scanning calorimetry (DSC). The reaction of thermal decomposition of complexes has been studied by non-isothermal and isothermal TG. The thermal decomposition reaction of complexes began in the solid phase for Tb(thd)3, Tm(thd)3 and Yb(thd)3 and in the liquid phase for Er(thd)3 and Lu(thd)3, as it was observed by TG/DTG/DSC superimposed curves. The kinetic model that best adjusted the experimental isothermal thermogravimetric data was the R1 model. Through the Ozawa method it was possible to find coherent results in the kinetic parameters and according to the activation energy the following stability order was obtained: Tb(thd)3>Lu(thd)3>Yb(thd)3>Tm(thd)3>Er(thd)3

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Authors and Affiliations

  1. Departamento de Química, CCEN, Campus I, Universidade Federal da Paraíba, 58059-900, Joăo Pessoa, Paraíba, Brazil

    J. G. Santos, M. M. Conceiçăo, M. F. Trindade & A. G. Souza

  2. Departamento de Química, CCEN, Universidade Federal do Rio Grande Norte, Natal, RN, Brazil

    A. S. Araújo & V. J. Fernandes Jr.

Authors
  1. J. G. Santos
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  2. M. M. Conceiçăo
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  3. M. F. Trindade
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  4. A. S. Araújo
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  5. V. J. Fernandes Jr.
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  6. A. G. Souza
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Santos, J.G., Conceiçăo, M.M., Trindade, M.F. et al. Kinetic study of dipivaloylmethane by ozawa method. Journal of Thermal Analysis and Calorimetry 75, 591–597 (2004). https://doi.org/10.1023/B:JTAN.0000027150.30994.48

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  • DOI: https://doi.org/10.1023/B:JTAN.0000027150.30994.48

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