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


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Output type: Journal article

UM6P affiliated Publication?: Yes

Publisher: Elsevier

Publication year: 2021

Journal: Applied Catalysis B: Environmental (0926-3373)

Volume number: 280

Start page: 119405

ISSN: 0926-3373

URL: https://www.sciencedirect.com/science/article/pii/S0926337320308201


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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.


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Last updated on 2021-19-06 at 23:18