Carbon Monoxide Oxidation on Metal-Supported Monolayer Oxide Films: Establishing Which Interface is Active.
Carbon Monoxide Oxidation on Metal-Supported Monolayer Oxide Films: Establishing Which Interface is Active.
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DOI：
10.1002/anie.201710934
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发表时间：
2018-01
影响因子：
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通讯作者：
Ke Zhang;Linfei Li;S. Shaikhutdinov;H. Freund
中科院分区：
文献类型：
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作者：
Ke Zhang;Linfei Li;S. Shaikhutdinov;H. Freund
近年来，在金属衬底上生长的过渡金属氧化物超薄（单层）薄膜作为一种有前景的催化材料受到了广泛的关注，特别是在低温CO氧化方面。当膜仅部分覆盖载体时，这种体系的反应速率通常会增加，这种效应通常归因于金属/氧化物边界处活性位点的形成。通过对FeO（111）薄膜在Pt（111）上的结构和反应性的研究表明，在反应条件下形成的氧化膜中，CO氧化发生在还原相和氧化相之间的界面上，而不受薄膜覆盖的影响。金属载体的促进作用是通过吸附在金属上的CO与氧化岛边缘的氧之间的反应，减缓还原相的形成。
Ultrathin (monolayer) films of transition metal oxides grown on metal substrates have recently received considerable attention as promising catalytic materials, in particular for low-temperature CO oxidation. The reaction rate on such systems often increases when the film only partially covers the support, and the effect is commonly attributed to the formation of active sites at the metal/oxide boundary. By studying the structure and reactivity of FeO(111) films on Pt(111), it is shown that, independent of the film coverage, CO oxidation takes place at the interface between reduced and oxidized phases in the oxide film formed under reaction conditions. The promotional role of a metal support is to ease formation of the reduced phase by reaction between CO adsorbed on metal and oxygen at the oxide island edge.