Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 22, Issue 34, Pages 18932-18949Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp00558d
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Funding
- Norwegian University of Science and Technology
- Norwegian Resource Council
- Anders Jahre fund for promotion of science
- A/S M. H. Lundgreens Enkes Fond
- EPSRC [EP/L02537X/1, EP/L020423/2, EP/N013778/1]
- EPSRC [EP/N013778/1, EP/L02537X/1] Funding Source: UKRI
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The implementation of ammonia as a hydrogen vector relies on the development of active catalysts to release hydrogen on-demand at low temperatures. As an alternative to ruthenium-based catalysts, herein we report the high activity of silica aerogel supported cobalt rhenium catalysts. XANES/EXAFS studies undertaken at reaction conditions in the presence of the ammonia feed reveal that the cobalt and rhenium components of the catalyst which had been pre-reduced are initially re-oxidised prior to their subsequent reduction to metallic and bimetallic species before catalytic activity is observed. A synergistic effect is apparent in which this re-reduction step occurs at considerably lower temperatures than for the corresponding monometallic counterpart materials. The rate of hydrogen productionviaammonia decomposition was determined to be 0.007 molH2gcat-1h-1at 450 degrees C. The current study indicates that reduced Co species are crucial for the development of catalytic activity.
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