Study of the hydrogen production step of the Mn2O 3/MnO thermochemical cycle

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

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

9 Citas (Scopus)

Resumen

In this work, a complete study of the second step of the Mn 2O3/MnO thermochemical cycle for solar hydrogen production has been performed. It includes a complete thermodynamic calculation of the equilibrium phases between MnO, NaOH and H2, which shows that the reaction takes place theoretically at temperatures above 75 C. However, the experimental results demonstrate that it is necessary at least 450 C to achieve a satisfactory reaction rate. It indicates a dramatic influence of chemical kinetics and diffusion process, displacing the reaction to higher temperatures than those predicted by thermodynamics. The resultant solid of the reaction exhibits a phases distribution highly dependent on the temperature and the NaOH:MnO ratio and this is of great influence in the overall rate of the process. The kinetic study shows that the overall process involves not only the chemical reaction between MnO and NaOH, but also a number of physical processes (heat and mass transfer) and solid phase transformations. The apparent activation energy calculated is a composite value determined by the activation energies of those elementary processes.

Idioma originalInglés
Páginas (desde-hasta)5274-5282
Número de páginas9
PublicaciónInternational Journal of Hydrogen Energy
Volumen39
N.º10
DOI
EstadoPublicada - 26 mar 2014

Áreas temáticas de ASJC Scopus

  • Energías renovables, sostenibilidad y medio ambiente
  • Tecnología del combustible
  • Física de la materia condensada
  • Ingeniería energética y tecnologías de la energía

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