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Study of the kinetics of decomposition of goethitein vacuo and pore structure of product particles

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Abstract

The kinetics of decomposition ofα-goethite were investigated, under vacuum conditions, in the temperature range 170–250° C. The experimental thermogravimetric traces were interpreted according to the shrinking core model for cylindrical particles. The Arrhenius plot of InK (kinetic constant) against 1/T yielded an activation energy of 119±9 kJ mol−1 at 210° C. The highest specific area,S BET=118.4±5.5 m2 g−1, of the reaction productα-hematite, was obtained by decompsition at 225° C. Information about the formation of micropores and their evolution with temperature was also obtained.

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Authors and Affiliations

  1. Dipartimento di Chimica, Ingegneria, Chimica e Materiali, Universita de L'Aquila, 67040, Monteluco di Roio, L'Aquila, Italy

    M. Pelino, L. Toro, M. Petroni, A. Florindi & C. Cantalini

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  1. M. Pelino
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  2. L. Toro
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  3. M. Petroni
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  4. A. Florindi
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  5. C. Cantalini
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Pelino, M., Toro, L., Petroni, M. et al. Study of the kinetics of decomposition of goethitein vacuo and pore structure of product particles. J Mater Sci 24, 409–412 (1989). https://doi.org/10.1007/BF01107419

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