Molybdenum oxide temperature dependence

Figures 2 and 3 show the uptake of molybdenum oxide vapor by various sized particles of clay loam and calcium ferrite at 1400°C. Over the temperature and oxide partial pressure ranges used in these experiments, molybdenum oxide vapor consists of a mixture of M0O3, Mo2Oe, and Mo309 molecules whose proportions are temperature and pressure dependent. Data which can be used to calculate these ratios are available from a report of a mass-spectrometric study of the sublimation of M0O2 by Bums et al. (6). Usually, for convenience, the total vapor concentration (/xgram/liter) of all the polymers of M0O3 vapor were used in this report in place of partial pressures. In some situations it was necessary to compute the partial pressure of each polymeric species.

Extensive studies have been made of the oxidations of all the halides by hydrogen peroxide. Mellor in 1904 was already able to cite fourteen investigations of kinetics of the hydrogen peroxide-hydrogen iodide reaction including studies of the temperature dependence of the rates and the kinetic form of catalysis by salts of molybdenum and iron. Since the processes (1) and (2)... 

Collective plot of the temperature dependence of the sulfidation and oxidation rates of binary and ternary aiioys compared to the suifidation rates of new Fe-Mo-Ai and Ni-Mo-Ai alloys and pure molybdenum (solid iines - suifidation dashed iines -oxidation). 

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