Kinetic parameters for the reactions of leather shavings with oxygen and carbon dioxide

This paper describes a kinetic study of the carbon reactions with oxygen and carbon dioxide (C-O 2 and C-CO 2 reaction). The tests were carried out in a thermobalance using carbon from leather shavings char, under isothermal conditions and atmospheric pressure. The experimental results showed a good fit with the Shrinking Unreacted-Core model controlled by chemical reaction, and the Progressive-Conversion model did not describe the process. According to Shrinking Unreacted-Core model, the reaction initially occurs on the external surface of the particle and the reaction zone moves toward the center of the particle, leaving behind a layer of inert solid (ash). On the other hand, in the Progressive-Conversion model reaction occurs simultaneously in the entire volume of the particle. The activation energies of the C-O 2 and C-CO 2 reactions were determinate, as well as their reaction orders.

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