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Enhanced CO Oxidation on the Oxide/Metal Interface: From Ultra‐High Vacuum to Near‐Atmospheric Pressures
Author(s) -
Pan Qiushi,
Weng Xuefei,
Chen Mingshu,
Giordano Livia,
Pacchioni Gianfranco,
Noguera Claudine,
Goniakowski Jacek,
Shaikhutdinov Shamil,
Freund HansJoachim
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201500394
Subject(s) - oxide , oxygen , metal , catalysis , bilayer , reactivity (psychology) , chemistry , inert , diffusion , atmospheric pressure , materials science , chemical engineering , inorganic chemistry , metallurgy , membrane , thermodynamics , medicine , biochemistry , alternative medicine , physics , oceanography , organic chemistry , pathology , engineering , geology
Abstract We studied CO oxidation on FeO(1 1 1) films on Pt(1 1 1) at submonolayer oxide coverages at ultrahigh vacuum and near‐atmospheric pressure conditions. The FeO(1 1 1) bilayer islands are inert towards CO 2 formation. In contrast, the FeO 2− x trilayer structure shows substantial CO 2 production that reaches a maximum at ≈40 % coverage at both pressure conditions. The results provide compelling evidence that the FeO 2− x /Pt(1 1 1) interface is the most active in CO oxidation. Although FeO 2− x boundaries possesses weakly bound oxygen species, strong binding of CO to Pt favors the reaction at the FeO 2− x /Pt interface as compared to the FeO 2− x /FeO one, thus giving a rationale to the reactivity enhancement observed in systems exposing metal/oxide boundaries. In addition, oxygen diffusion from the interior of an FeO 2− x island to the active edge sites may be effective for the oxygen replenishment in the CO oxidation catalytic cycle.