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| Naji, M. |
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| Petrov, R. H. | Madrid |
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| Rančić, M. |
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| Azevedo, Nuno Monteiro |
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article
Reduction kinetics for large spherical 2:1 iron–manganese oxide redox materials for thermochemical energy storage
Abstract
Spherical 0.5 to 1 mm iron–manganese oxide with the Fe/Mn molar ratio of 2:1 is investigated as a potential material to be used in a thermochemical energy storage (TCES) system. Both iron and manganese oxides are abundant, economical and non-toxic materials which make the mixture an acceptable candidate for energy storage in industrial TCES applications. Thermodynamics and kinetics of the reduction step for the redox process are studied. Analysis includes development of a reaction rate expression that is useful for reactor design. Kinetic analysis is performed by non-linear regression applied to non-isothermal data recorded using thermogravimetric analysis (TGA) at four heating rates along with differential scanning calorimetry (DSC). The thermal reduction is carried out in both argon and air atmospheres. A shrinking core model was used to fit the kinetic data for the large spherical particles. Analysis indicates that thermal reduction is controlled by oxygen internal diffusion for an argon atmosphere. For the reduction reaction in air, the oxygen internal diffusion followed by oxygen external diffusion control the process.