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

Abstract Data from heated in‐situ X‐ray diffraction and thermogravimetry from the decomposition of MnO 2 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 MnO 2 : MnO 2 →Mn 2 O 3 →Mn 3 O 4 and for the oxidation of Mn: Mn→MnO→Mn 3 O 4 →Mn 2 O 3 . 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.