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- W1966140131 abstract "A non-isothermal kinetic study of the oxidation of “carbon-modified MoO3” in the temperature range of 150–550°C by simultaneous TGA–DTA was investigated. During the oxidation process, two thermal events were detected, which are associated with the oxidation of carbon in MoOxCy and MoO2 to MoO3. The model-free and model-fitting kinetic approaches have been applied to TGA experimental data. The solid state-kinetics of the oxidation of MoOxCy to MoO3 is governed by F1 (unimolecular decay), which suggests that the reaction is of the first order with respect to oxygen concentration. The constant (Ea)α value (about 115±5 kJ/mol) for this first stage can be related to the nature of the reaction site in the MoO3 matrix. This indicates that oxidation occurs in well-defined lattice position sites (energetically equivalent). On the other hand, for the second stage of oxidation, MoO2 to MoO3, the isoconversional analysis shows a complex (Ea)α dependence on (α) and reveals a typical behavior for competitive reaction. A D2 (two-dimensional diffusion) mechanism with a variable activation energy value in the range 110–200 kJ/mol was obtained. This can be interpreted as an inter-layer oxygen diffusion in the solid bulk, which does not exclude other simultaneous mechanism reactions." @default.
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- W1966140131 date "2004-10-01" @default.
- W1966140131 modified "2023-10-03" @default.
- W1966140131 title "Oxidation process of MoOxCy to MoO3: kinetics and mechanism" @default.
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- W1966140131 doi "https://doi.org/10.1016/j.jssc.2004.05.035" @default.
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