Kinetic modelling of the first step of Mn2O3/MnO thermochemical cycle for solar hydrogen production

J. A. Botas, J. Marugán, R. Molina, C. Herradón

Resultado de la investigación: Article

22 Citas (Scopus)

Resumen

This work reports the kinetic study of the first step of the Mn 2O3/MnO thermochemical cycle for hydrogen production by water splitting. The reaction kinetics of Mn (III) oxide thermal reduction has been evaluated using dynamic thermogravimetric analysis at constant heating rate under nitrogen flow. This way the reaction rate can be described as a function of temperature and different kinetic models were fitted to the experimental data obtained from thermogravimetric experiments. A good fitting can be observed for each experiment, although a significant disparity in the values estimated for the Arrhenius parameters has been found (activation energies and pre-exponential factors). Unique values for the kinetic parameters have been calculated by application of a multivariate non-linear regression method for the simultaneous fitting of data from all the experiments carried out at different heating ramps. However, also in this case the values of the Arrhenius parameters are significantly different depending on the chosen kinetic equation. Optimal kinetic parameters have been finally calculated through the estimation of activation energy values by model-free isoconversional methods and using a rigorous multivariate nonlinear regression for the calculation of the model-dependant pre-exponential factors.

Idioma originalEnglish
Páginas (desde-hasta)18661-18671
Número de páginas11
PublicaciónInternational Journal of Hydrogen Energy
Volumen37
N.º24
DOI
EstadoPublished - 1 dic 2012

Huella dactilar

hydrogen production
Hydrogen production
Kinetic parameters
cycles
Kinetics
kinetics
Activation energy
regression analysis
reaction kinetics
Experiments
activation energy
Heating rate
Reaction kinetics
Reaction rates
heating
water splitting
Thermogravimetric analysis
ramps
kinetic equations
Nitrogen

ASJC Scopus subject areas

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

Citar esto

Botas, J. A. ; Marugán, J. ; Molina, R. ; Herradón, C. / Kinetic modelling of the first step of Mn2O3/MnO thermochemical cycle for solar hydrogen production. En: International Journal of Hydrogen Energy. 2012 ; Vol. 37, N.º 24. pp. 18661-18671.
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Kinetic modelling of the first step of Mn2O3/MnO thermochemical cycle for solar hydrogen production. / Botas, J. A.; Marugán, J.; Molina, R.; Herradón, C.

En: International Journal of Hydrogen Energy, Vol. 37, N.º 24, 01.12.2012, p. 18661-18671.

Resultado de la investigación: Article

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