Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 5, Issue 4, Pages 6313-6320Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ee02393d
Keywords
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Funding
- National Natural Science Foundation of China [20733008, 11079005, 20923001]
- Ministry of Science and Technology of China, and Chinese Academy of Sciences
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Surface Fe ensembles, surface alloyed Fe atoms, and subsurface Fe species have been identified at Pt surfaces on the basis of studies in Fe-Pt(111) model systems and supported Pt-Fe nanoparticles (NPs). The surface Fe ensemble changes to ferrous oxide and forms a highly active and stable FeO-on-Pt structure in preferential oxidation of CO in the presence of H-2 (PROX), which, however, gets fully oxidized in CO oxidation in the absence of H-2 (COOX) and becomes inactive in the reaction. The surface alloyed Fe remains stable under the H-2-rich and O-2-rich reaction conditions, which are active for both PROX and COOX reactions. Accordingly, highly efficient Pt-Fe catalysts for the PROX and COOX reactions can be prepared via mild reduction and/or acid leaching.
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