Study of the first step of the Mn 2O 3/MnO thermochemical cycle for solar hydrogen production

Javier Marugán, Juan A. Botas, Mariana Martín, Raúl Molina, Carolina Herradón

Resultado de la investigación: Article

23 Citas (Scopus)

Resumen

In this work, a complete thermodynamic study of the first step of the Mn 2O 3/MnO thermochemical cycle for solar hydrogen production has been performed. The thermal reduction of Mn 2O 3 takes place through a sequential mechanism of two reaction steps. The first step (reduction of Mn 2O 3 to Mn 3O 4) takes place at teomperatures above 700 °C, whereas the second reaction step (reduction of Mn 3O 4 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/Mn 2O 3 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.

Idioma originalEnglish
Páginas (desde-hasta)7017-7025
Número de páginas9
PublicaciónInternational Journal of Hydrogen Energy
Volumen37
N.º8
DOI
EstadoPublished - 1 abr 2012

Huella dactilar

hydrogen production
Hydrogen production
cycles
thermodynamics
Thermodynamics
manganese oxides
Manganese oxide
reaction kinetics
Temperature
solar energy
furnaces
Inert gases
rare gases
Reaction kinetics
Solar energy
Reaction rates
Furnaces
temperature
predictions
Experiments

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Citar esto

Marugán, Javier ; Botas, Juan A. ; Martín, Mariana ; Molina, Raúl ; Herradón, Carolina. / Study of the first step of the Mn 2O 3/MnO thermochemical cycle for solar hydrogen production. En: International Journal of Hydrogen Energy. 2012 ; Vol. 37, N.º 8. pp. 7017-7025.
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abstract = "In this work, a complete thermodynamic study of the first step of the Mn 2O 3/MnO thermochemical cycle for solar hydrogen production has been performed. The thermal reduction of Mn 2O 3 takes place through a sequential mechanism of two reaction steps. The first step (reduction of Mn 2O 3 to Mn 3O 4) takes place at teomperatures above 700 °C, whereas the second reaction step (reduction of Mn 3O 4 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/Mn 2O 3 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.",
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Study of the first step of the Mn 2O 3/MnO thermochemical cycle for solar hydrogen production. / Marugán, Javier; Botas, Juan A.; Martín, Mariana; Molina, Raúl; Herradón, Carolina.

En: International Journal of Hydrogen Energy, Vol. 37, N.º 8, 01.04.2012, p. 7017-7025.

Resultado de la investigación: Article

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T1 - Study of the first step of the Mn 2O 3/MnO thermochemical cycle for solar hydrogen production

AU - Marugán, Javier

AU - Botas, Juan A.

AU - Martín, Mariana

AU - Molina, Raúl

AU - Herradón, Carolina

PY - 2012/4/1

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N2 - In this work, a complete thermodynamic study of the first step of the Mn 2O 3/MnO thermochemical cycle for solar hydrogen production has been performed. The thermal reduction of Mn 2O 3 takes place through a sequential mechanism of two reaction steps. The first step (reduction of Mn 2O 3 to Mn 3O 4) takes place at teomperatures above 700 °C, whereas the second reaction step (reduction of Mn 3O 4 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/Mn 2O 3 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.

AB - In this work, a complete thermodynamic study of the first step of the Mn 2O 3/MnO thermochemical cycle for solar hydrogen production has been performed. The thermal reduction of Mn 2O 3 takes place through a sequential mechanism of two reaction steps. The first step (reduction of Mn 2O 3 to Mn 3O 4) takes place at teomperatures above 700 °C, whereas the second reaction step (reduction of Mn 3O 4 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/Mn 2O 3 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.

KW - Hydrogen production

KW - Manganese oxide

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