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Modelling ammonia and nitrous oxide decomposition reactions in solid oxide fuel cells for combined energy generation and treatment of flue gas streams

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  • Duarte, Miguel
  • Holz, Laura I.V.
  • Fernandes, Celina
  • Ribeirinha, Paulo
  • Fagg, Duncan P.
  • Mendes, Adélio

Abstract

Solid oxide fuel cells (SOFCs) offer a promising technology for clean and efficient power generation. In this study, an SOFC combining in-situ hydrogen generation from ammonia with nitrous oxide reduction to nitrogen was simulated and validated against experimental results for the first time. Ammonia decomposition generates the hydrogen needed for the electroreduction of nitrous oxide, with simultaneous generation of electrical power. Nickel was considered as the anode catalyst since it is highly active for ammonia decomposition. Perovskite catalyst LSCF - lanthanum strontium cobalt ferrite, was used as the cathode where N2O, a potent greenhouse gas, is efficiently decomposed into harmless molecular nitrogen and oxygen. The simulation study was performed on ANSYS Fluent, a CFD platform. The developed simulator was revealed to be a powerful tool to understand and optimize the operating conditions of the reactor, when applied to the treatment of the flue gas of a nitric acid plant. Under optimal conditions, the modelled reactor displays current densities >100 mA·cm−2 and power densities of ca. 11 mW·cm−2, where full conversion of N2O could be obtained by adjustments of the residence time.

Suggested Citation

  • Duarte, Miguel & Holz, Laura I.V. & Fernandes, Celina & Ribeirinha, Paulo & Fagg, Duncan P. & Mendes, Adélio, 2024. "Modelling ammonia and nitrous oxide decomposition reactions in solid oxide fuel cells for combined energy generation and treatment of flue gas streams," Applied Energy, Elsevier, vol. 368(C).
    • Handle: RePEc:eee:appene:v:368:y:2024:i:c:s0306261924008481
    DOI: 10.1016/j.apenergy.2024.123465
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    References listed on IDEAS

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    1. R. L. Thompson & L. Lassaletta & P. K. Patra & C. Wilson & K. C. Wells & A. Gressent & E. N. Koffi & M. P. Chipperfield & W. Winiwarter & E. A. Davidson & H. Tian & J. G. Canadell, 2019. "Acceleration of global N2O emissions seen from two decades of atmospheric inversion," Nature Climate Change, Nature, vol. 9(12), pages 993-998, December.
    2. Linda Barelli & Gianni Bidini & Giovanni Cinti, 2020. "Operation of a Solid Oxide Fuel Cell Based Power System with Ammonia as a Fuel: Experimental Test and System Design," Energies, MDPI, vol. 13(23), pages 1-19, November.
    3. Hanqin Tian & Rongting Xu & Josep G. Canadell & Rona L. Thompson & Wilfried Winiwarter & Parvadha Suntharalingam & Eric A. Davidson & Philippe Ciais & Robert B. Jackson & Greet Janssens-Maenhout & Mic, 2020. "A comprehensive quantification of global nitrous oxide sources and sinks," Nature, Nature, vol. 586(7828), pages 248-256, October.
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