Promotion effect of proton-conducting oxide BaZr0. 1Ce0. 7Y0. 2O3− δ on the catalytic activity of Ni towards ammonia synthesis from hydrogen and nitrogen

John Humphreys, Rong Lan, Dongwei Du, Wei Xu, Shanwen Tao

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Abstract

In this report, for the first time, it has been observed that proton-conducting oxide BaZr0.1Ce0.7Y0.2O3−δ (BZCY) has significant promotion effect on the catalytic activity of Ni towards ammonia synthesis from hydrogen and nitrogen. Renewable hydrogen can be used for ammonia synthesis to save CO2 emission. By investigating the operating parameters of the reaction the optimal conditions for this catalyst were identified. It was found that at 620 °C with a total flow rate of 200 mL min−1 and a H2/N2 mol ratio of 3, an activity of approximately 250 μmol g−1 h−1 can be achieved. This is ten times larger than that for the unpromoted Ni catalyst under the same conditions although the stability of both catalysts in the presence of steam was not good. The specific activity of Ni supported on proton-conducting oxide BZCY is approximately 72 times higher than that of Ni supported on non-proton conductor MgOCeO2.
Original languageEnglish
Pages (from-to)17726-17736
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume43
Issue number37
Early online date23 Aug 2018
DOIs
Publication statusPublished - 13 Sep 2018

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Keywords

  • Renewable hydrogen
  • Ammonia synthesis
  • Catalysis
  • Proton conductor
  • Nickel catalyst
  • Catalyst promoter

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