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• W1966123818 abstract "In this work, a complete thermodynamic study of the first step of the Mn2O3/MnO thermochemical cycle for solar hydrogen production has been performed. The thermal reduction of Mn2O3 takes place through a sequential mechanism of two reaction steps. The first step (reduction of Mn2O3 to Mn3O4) takes place at teomperatures above 700 °C, whereas the second reaction step (reduction of Mn3O4 to MnO) requires temperatures above 1350 °C to achieve satisfactory reaction rates and conversions. Equilibrium can be displaced to lower temperatures by increasing the inert gas/Mn2O3 ratio or decreasing the pressure. The thermodynamic calculations have been validated by thermogravimetric experiments carried out in a high temperature tubular furnace. Experimental results corroborate the theoretical predictions although a dramatically influence of chemical kinetics and diffusion process has been also demonstrated, displacing the reactions to higher temperatures than those predicted by thermodynamics. Finally, this work demonstrates that the first step of the manganese oxide thermochemical cycle for hydrogen production can be carried out with total conversion at temperatures compatible with solar energy concentration devices. The range of required temperatures is lower than those commonly reported in literature for the manganese oxide cycle obtained from theoretical and thermodynamic studies." @default.
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• W1966123818 date "2012-04-01" @default.
• W1966123818 modified "2023-09-23" @default.
• W1966123818 title "Study of the first step of the Mn2O3/MnO thermochemical cycle for solar hydrogen production" @default.
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• W1966123818 doi "https://doi.org/10.1016/j.ijhydene.2011.10.124" @default.
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