Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 280, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119405
Keywords
ammonia; hydrogen; XAS; cobalt; rhenium
Funding
- UK Engineering and Physical Science Research Council (EPSRC) [EP/L020432/2, EP/N013778/1, EP/L02537X/1, EP/L026317/1]
- Norwegian University of Science and Technology
- Norwegian Resource Council
- Anders Jahre fund for promotion of science
- EPSRC [EP/L02537X/1, EP/L020432/2] Funding Source: UKRI
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This study developed cobalt-rhenium (Co-Re) catalysts for on-demand hydrogen production from ammonia, showing high activity and stability in consecutive runs without formation of nitrides under the ammonia atmosphere. The results provide insight for the development of highly active alloy based ammonia decomposition catalysts.
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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