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Kinetics of chlorination and oxychlorination of chromium (III) oxide

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Abstract

Thermogravimetric analysis (TGA) is used to study the kinetics of chlorination of Cr2O3 with Cl2+N2 and Cl2+O2 gas mixtures in the temperature range of 550 °C to 1000 °C. The reactivity of Cr2O3 toward the chlorine-oxygen gas mixture is higher than that toward the chlorine-nitrogen one. Chlorination of Cr2O3 proceeds with an apparent activation energy of about 86 kJ/mol between 550 °C and 1000 °C. The apparent reaction order with respect to chlorine is about 1.23 at 800 °C. At temperatures lower than 650 °C, the shrinking sphere model is the most appropriate for describing the reaction kinetics. Oxychlorination of Cr2O3 is characterized by an apparent activation energy of about 87 and 46 kJ/mol for temperatures lower than 650 °C and higher than 700 °C, respectively. At 800 °C and using a Cl2+O2 gas mixture, the maximum reaction rate is obtained when the Cl2/O2 molar ratio is equal to 4, confirming the formation of chromium oxychloride. At this temperature, the reaction orders with respect to chlorine, oxygen, and Cl2+O2 are about 1.08, 0.23, and 1.29, respectively. Mathematical fitting of the experimental data is discussed.

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Author notes

  1. I. Gaballah (Senior Researcher)

    Present address: the Laboratoire Environnement et Minéralurgie ‘LEM’, Ecole National Supérieure de Géologie, rue du Doyen M. Roubalt, BP 40, 54501, Vandoeuvre Cedex, France

  2. S. Ivanaj (Researcher with LEM, General Manager)

    Present address: Envo Tech, 54000, Nancy, France

Authors and Affiliations

  1. the Laboratoire Environnement et Minéralurgie ‘LEM’, Ecole National Supérieure de Géologie, rue du Doyen M. Roubalt, BP 40, 54501, Vandoeuvre Cedex, France

    N. Kanari (Researcher, associated)

  2. the Centre National de la Recherche Scientifique, Mineral Processing and Environmental Engineering Team, Ecole National Supérieure de Géologie, rue du Doyen M. Roubalt, BP 40, 54501, Vandoeuvre Cedex, France

    I. Gaballah (Senior Researcher)

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  1. I. Gaballah
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  2. N. Kanari
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Gaballah, I., Kanari, N. & Ivanaj, S. Kinetics of chlorination and oxychlorination of chromium (III) oxide. Metall Mater Trans A 29, 1299–1308 (1998). https://doi.org/10.1007/s11661-998-0256-1

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  • DOI: https://doi.org/10.1007/s11661-998-0256-1

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