Chemical Kinetics of the Oxidation of Manganese and of the Decomposition of MnO2 by XRD and TG Measurements

Data from heated in‐situ X‐ray diffraction and thermogravimetry from the decomposition of MnO2 and from the oxidation of Mn are evaluated to get kinetical parameters for combustion and reaction modelling. Reaction schemes could be derived for the decomposition of MnO2: MnO2RTMn2O3RTMn3O4 and for the oxidation of Mn: MnRTMnORTMn3O4RTMn2O3. Different reaction models were used to fit the data and result in different kinetical parameters for the reaction steps. But comparing the results is very difficult and does not give a conclusive picture.