COx-free hydrogen production from ammonia – mimicking the activity of Ru catalysts with unsupported Co-Re alloys

Karsten Kirste, Kate McAulay, Tamsin E. Bell, Dragos Stoian, Said Laassiri, Angela Daisley, Justin S.J. Hargreaves *, Karina Mathisen*, Laura Torrente-Murciano*

*Corresponding author for this work

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Abstract

On-demand production of hydrogen from ammonia is a challenge limiting the implementation of ammonia as a long term hydrogen vector to overcome the difficulties associated with hydrogen storage. Herein, we present the development of catalysts for the on-demand production of hydrogen from ammonia by combining metals with high and low N-adatom adsorption energies. In this way, cobalt-rhenium (Co-Re) catalysts show high activity mimicking that of ruthenium. EXAFS/XANES analyses demonstrate that the bimetallic Co-Re contribution is responsible for the activity and the stability of the catalysts in consecutive runs with no observable formation of nitrides (Co-N and Re-N) occurring under the ammonia atmosphere. While cobalt is partially re-oxidised under ammonia, re-reduction in the presence of rhenium is observed at higher temperatures, coinciding with the on-set of catalytic activity which is accompanied by minor structural changes. These results provide insight for the development of highly active alloy based ammonia decomposition catalysts.
Original languageEnglish
Article number119405
Number of pages14
JournalApplied Catalysis B: Environmental
Volume280
Early online date7 Aug 2020
DOIs
Publication statusE-pub ahead of print - 7 Aug 2020

Keywords

  • ammonia; hydrogen; XAS; cobalt; rhenium

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