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Kinetics of carbochlorination of chromium (III) oxide

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Abstract

Kinetics of the carbochlorination of Cr2O3 has been studied with Cl2+CO gas mixtures between 500 °C to 900 °C using thermogravimetric analysis. The apparent activation energy is about 100 kJ/mol. Mathematical fitting of the experimental data suggests that the shrinking sphere model is the most adequate to describe the carbochlorination mechanism of chromium oxide and that is controlled by the chemical reaction. In the temperature range of 550 °C to 800 °C, the reaction order is about 1.34 and is independent of temperature. Changing the Cl2+CO content from 15 to 100 pct increases the reaction rate and does not affect the reaction mechanism. Similarly, changing the ratio of Cl2/(Cl2+CO) from 0.125 to 0.857 does not modify the carbochlorination mechanism of Cr2O3. In these conditions, the reaction rate passes through a maximum when using a chlorinating gas mixture having a Cl2/(Cl2+CO) ratio of about 0.5.

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Author notes

  1. B. R. Reddy (Visiting Scientist to LEM)

    Present address: Scientist E1, Regional Research Laboratory, 751 013, Bhubaneswar, Orissa, India

Authors and Affiliations

  1. the Laboratoire Environnement et Minéralurgie ‘LEM’, associated with the Centre National de la Recherche Scientifique, Mineral Processing and Environmental Engineering Team, École Nationale Supérieure de Géologie, rue du Doyen M. Roubault, BP 40, 54501, Vandoeuvre, Cedex, France

    N. Kanari (Researcher) & I. Gaballah (Senior Researcher)

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  1. N. Kanari
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  2. I. Gaballah
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  3. B. R. Reddy
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Kanari, N., Gaballah, I. & Reddy, B.R. Kinetics of carbochlorination of chromium (III) oxide. Metall Mater Trans B 29, 729–737 (1998). https://doi.org/10.1007/s11663-998-0131-x

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  • DOI: https://doi.org/10.1007/s11663-998-0131-x

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