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• W4293240387 endingPage "11218" @default.
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• W4293240387 abstract "Fe2O3/Fe3O4 redox couple is a less explored system used for high-temperature thermochemical energy storage. There is a kind of FeOx-based mineral in coal-fired fly ash that is mainly composed of FeOx and contains a small amount of silica–aluminate impurities. This industrial solid waste produced in huge quantities every year has the potential to be used for thermochemical energy storage. In this work, pretreatment was carried out on FeOx-based minerals derived from different fly ashes to improve their thermochemical energy storage capacity, and cyclic thermochemical energy storage properties were tested using a thermogravimetric analyzer under an air atmosphere. It is found that the energy storage densities of the FeOx-based minerals are in the range of 297.79–342.00 kJ/mol, and the maximum value even exceeds the energy storage density of commercial Fe2O3. The oxidation reaction process of FeOx-based minerals is much slower than that of commercial Fe2O3 because the pore structure of FeOx-based minerals is degraded in comparison to that of commercial Fe2O3. It is found that the majority of FeOx-based minerals are spheroids with a shell–core structure, and the Fe content in the outer layer is lower than that in the inner core, which will affect the reaction rate. The master plot method and Friedman method were further used to investigate the kinetics of the reduction reaction of the FeOx-based minerals. It is found that the reduction reaction of FeOx-based minerals follows a Prout–Tompkins reaction mechanism. An economic analysis of the FeOx-based minerals for energy storage was carried out, and there is a coal saving of 139.4 tonnes/day for their use in a photothermal power plant. In summary, the FeOx-based minerals have the potential to be used for large-scale thermochemical heat storage." @default.
• W4293240387 created "2022-08-27" @default.
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• W4293240387 date "2022-08-25" @default.
• W4293240387 modified "2023-10-16" @default.
• W4293240387 title "FeO_<i>x</i>-Based Minerals Derived from Coal-Fired Fly Ash Used for High-Temperature Thermochemical Energy Storage" @default.
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• W4293240387 doi "https://doi.org/10.1021/acs.energyfuels.2c02167" @default.
• W4293240387 hasPublicationYear "2022" @default.
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