Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 20, Pages 10180-10187Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta01151g
Keywords
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Funding
- National Natural Science Foundation of China [51702106, 51835005, 51911540476, 51871103]
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Carbon monoxide (CO) preferential oxidation (PROX) is regarded as a promising method for hydrogen purification. Herein, the design and synthesis of highly dispersed Pt studded on CoOx catalysts are reported. The catalysts exhibit nearly 100% CO conversion and selectivity towards the CO PROX reaction under H-2 stream at room temperature. The superior catalytic performance can be attributed to the unique structure. The Pt is selectively studded on CoOx nanoclusters to maximize the highly active metal-oxide interfaces. The Pt loading is reduced to similar to 0.8%, which is one of the lowest reported loadings for Pt-based CO PROX catalysts. The kinetics studies reveal that the composite Pt-Co catalysts have a weaker CO adsorption and lower O-2 activation barrier, which can increase the CO oxidation rate and suppress the H-2 oxidation rate. In addition, it is found that the CoOx promotor in a lower chemical oxidation state is critical for the improved activity. Theoretical simulations reveal that the energetic route of CO oxidation in H-2 for Pt/CoO is more active than that for a Pt/Co3O4 surface.
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