期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 11, 页码 4252-4256出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201406644
关键词
metal/oxide interface; model catalysts; reaction mechanism; surface chemistry; water
资金
- National Basic Research Program of China [2013CB933104]
- National Natural Science Foundation of China [U1332113]
- Chinese Academy of Sciences [KJZD-EW-M03]
- MOE Fundamental Research Funds for the Central Universities [WK2060030017]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
H-2-promoted catalytic activity of oxide-supported metal catalysts in low-temperature CO oxidation is of great interest but its origin remains unknown. Employing an FeO(111)/Pt(111) inverse model catalyst, we herewith report direct experimental evidence for the spillover of H(a) adatoms on the Pt surface formed by H-2 dissociation to the Pt FeO interface to form hydroxyl groups that facilely oxidize CO(a) on the neighboring Pt surface to produce CO2. Hydroxyl groups and coadsorbed water play a crucial role in the occurrence of hydrogen spillover. These results unambiguously identify the occurrence of hydrogen spillover from the metal surface to the noble metal/metal oxide interface and the resultant enhanced catalytic activity of the metal/oxide interface in low-temperature CO oxidation, which provides a molecular-level understanding of both H-2-promoted catalytic activity of metal/oxide ensembles in low-temperature CO oxidation and hydrogen spillover.
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