Abstract
Kinetics of chlorination of V2O5 with Cl2-air, C12-N2, and C12-CO-N2 gas mixtures have been studied by nonisothermal and isothermal thermogravimetric measurements. In the temperature range of 500 °C to 570 °C, the chlorination of V2O5 with C12-N2 gas mixture is characterized by an apparent activation energy of about 235 kJ/mole. This could be attributed to chemical reaction. Between 570°C and 650 °C, the apparent activation energy is equal to 77 kJ/mole, indicating that the overall reaction rate is controlled by chemical reaction and pore diffusion. The reaction order with respect to chlorine is 0.78. The apparent activation energy of the carbochlorination of V2O5 by C12-CO-N2 gas mixture is about 100 kJ/mole in the temperature range of 400 °C to 620 °C. In this case, the chemical reaction is the limiting step. At temperatures higher than 620 °C, an anomaly is observed in the Arrhenius plot, probably due to thermal decomposition of COC12 formedin situ and/or transformation of the vanadium oxide physical state. The maximum reaction rate is obtained by using a C12-CO-N2 gas mixture having a C12/CO volume ratio equal to about 1.
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Formerly Graduate Student, Mineral Processing and Environmental Engineering Team.
Formerly Graduate Student, Mineral Processing and Engineering Team, Institut National Polytechnique de Lorraine, Vandoeuvre, France.
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Gaballah, I., Djona, M. & Allain, E. Kinetics of chlorination and carbochlorination of vanadium pentoxide. Metall Mater Trans B 26, 711–718 (1995). https://doi.org/10.1007/BF02651717
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DOI: https://doi.org/10.1007/BF02651717