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Issue 3, 1990
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Oxidation kinetics of chromium(III) chloride


The kinetic behaviour of anhydrous chromium(III) chloride pellets in oxygen in the temperature range 350–630 °C has been examined by isothermal and temperature-programmed thermogravimetry and scanning electron microscopy. The reaction starts at ca. 400 °C under non-isothermal conditions and exhibits a deceleratory rate. Cr2O3 is usually the only solid product detected, although CrO2Cl2 or CrOCl may form under extreme experimental conditions. Isothermal thermogravimetric curves are fitted to a number of kinetic expressions, and statistical analyses are used to identify the rate equation that best describes the experimental data. The examination, by scanning electron microscopy, of cross-sections of partially reacted samples supports the conclusion that the reaction is under chemical control, and occurs at a linearly advancing interface between the reactant and product. The reaction kinetics can best be described by a contracting-geometry rate expression.

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Article information

J. Chem. Soc., Faraday Trans., 1990,86, 525-530
Article type

Oxidation kinetics of chromium(III) chloride

K. C. Sole, M. B. Mooiman and M. E. Brown, J. Chem. Soc., Faraday Trans., 1990, 86, 525
DOI: 10.1039/FT9908600525

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