Determination of temperature effect of oxychlorination of Cr2O3 and MgO using non-isothermal conditions

The effect of temperature on the oxychlorination of Cr 2 O 3 and MgO using Cl 2 +O 2 was evaluated using non-isothermal conditions. A mathematical treatment of the experimental data was performed. Results were compared with those obtained using isothermal conditions. The oxychlorination of Cr 2 O 3 up to 650°C was characterized by an apparent activation energy ‘ E a ’ of ca. 83 kJ/mol. Beyond 650°C, the reaction proceeded with an E a of ca. 51 kJ/mol. Between 850 and 1025°C, the reaction of MgO with Cl 2 +O 2 was strongly dependent on temperature and its E a was equal to ca. 215 kJ/mol. The values of the apparent activation energies, found for the oxychlorination of both oxides using non-isothermal conditions, were comparable to those obtained during isothermal treatment.