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Thermodynamic assessment of hydrogen production and cobalt oxidation susceptibility under ethanol reforming conditions

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  • de Ávila, C.N.
  • Hori, C.E.
  • de Assis, A.J.

Abstract

A comparative thermodynamic analysis of ethanol reforming reactions was conducted using an in-house code. Equilibrium compositions were estimated using the Lagrange multipliers method, which generated systems of non-linear algebraic equations, solved numerically. Effects of temperature, pressure and steam to ethanol, O2 to ethanol and CO2 to ethanol ratios on the equilibrium compositions were evaluated. The validation was done by comparing these data with experimental literature. The results of this work proved to be useful to foresee whether the experimental results follow the stoichiometry of the reactions involved in each process. Mole fractions of H2 and CO2 proved to be the most reliable variables to make this type of validation. Maximization of H2 mole fraction was attained between 773 and 873 K, but maximum net mole production of H2 was only achieved at higher temperatures (>1123 K). This work also advances in the thermodynamics of solid–gas phase interactions. A solid phase thermodynamic analysis was performed to confirm that Co0 formation from CoO is spontaneous under steam reforming conditions. The results showed that this reduction process occurs only for temperatures higher than 430 K. It was also found that once reduced, Co based catalysts will never oxidize back to Co3O4.

Suggested Citation

  • de Ávila, C.N. & Hori, C.E. & de Assis, A.J., 2011. "Thermodynamic assessment of hydrogen production and cobalt oxidation susceptibility under ethanol reforming conditions," Energy, Elsevier, vol. 36(7), pages 4385-4395.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:7:p:4385-4395
    DOI: 10.1016/j.energy.2011.04.004
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    References listed on IDEAS

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    1. Barbir, Frano, 2009. "Transition to renewable energy systems with hydrogen as an energy carrier," Energy, Elsevier, vol. 34(3), pages 308-312.
    2. Jing, Q.S. & Zheng, X.M., 2006. "Combined catalytic partial oxidation and CO2 reforming of methane over ZrO2-modified Ni/SiO2 catalysts using fluidized-bed reactor," Energy, Elsevier, vol. 31(12), pages 2184-2192.
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    1. Wu, Horng-Wen & Lin, Ke-Wei, 2019. "Hydrogen-rich syngas production by reforming of ethanol blended with aqueous urea using a thermodynamic analysis," Energy, Elsevier, vol. 166(C), pages 541-551.
    2. Spallina, V. & Matturro, G. & Ruocco, C. & Meloni, E. & Palma, V. & Fernandez, E. & Melendez, J. & Pacheco Tanaka, A.D. & Viviente Sole, J.L. & van Sint Annaland, M. & Gallucci, F., 2018. "Direct route from ethanol to pure hydrogen through autothermal reforming in a membrane reactor: Experimental demonstration, reactor modelling and design," Energy, Elsevier, vol. 143(C), pages 666-681.
    3. Resende, K.A. & Ávila-Neto, C.N. & Rabelo-Neto, R.C. & Noronha, F.B. & Hori, C.E., 2015. "Thermodynamic analysis and reaction routes of steam reforming of bio-oil aqueous fraction," Renewable Energy, Elsevier, vol. 80(C), pages 166-176.
    4. Lee, Jun Sung & Han, Gi Bo & Kang, Misook, 2012. "Low temperature steam reforming of ethanol for carbon monoxide-free hydrogen production over mesoporous Sn-incorporated SBA-15 catalysts," Energy, Elsevier, vol. 44(1), pages 248-256.
    5. Sun, Shaohui & Yan, Wei & Sun, Peiqin & Chen, Junwu, 2012. "Thermodynamic analysis of ethanol reforming for hydrogen production," Energy, Elsevier, vol. 44(1), pages 911-924.

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