Add time:08/15/2019         Source:sciencedirect.com

Simultaneous thermal analysis curves and X-ray examination were used to determine the intermediate steps for the dissociation of hydrated cerium(III) sulfate and to confirm those for the dissociation of hydrated cerium(III) nitrate and oxalate. Thermogravimetric methods were applied for these steps to determine the operating mechanisms and kinetic parameters. These methods were assessed in view of the present results. Techniques to treat similar results were recommended to overcome the difficulties encountered during this study, such as the variation of activation energies and pre-exponential factors with temperature for the same mechanism as well as the change of the mechanism with temperature. Methods for differentiation between the deduced mechanisms to conclude the operating mechanism are discussed. Techniques to deal with mechanisms having low activation energies or existing over wide temperature ranges are still needed.

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