The selective blocking of potentially catalytically active sites on surface-supported iron oxide catalysts
The selective blocking of potentially catalytically active sites on surface-supported iron oxide catalysts
复制标题
表面负载氧化铁催化剂上潜在催化活性位点的选择性封闭
DOI：
10.1039/d2qm01025a
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发表时间：
2023
影响因子：
7
通讯作者：
Jiang, Nan
中科院分区：
文献类型：
--
作者：
Liu, Dairong;Li, Linfei;Gedara, Buddhika S.;Trenary, Michael;Jiang, Nan
在过去的几十年里，对超薄氧化亚铁(FeO)岛和薄膜的广泛研究为理解它们的结构和催化性能做出了重要贡献。在这方面，FeO边的局部化学性质，如它们的金属亲和力，在确定和调节FeO的催化活性方面发挥着关键作用，但这在很大程度上仍未被探索。在这项工作中，我们使用扫描隧道显微镜(STM)研究了Pd、Pt与生长在Au(111)面上的FeO之间的相互作用。Pd和Pt对Fe的亲和力不同，Pd优先生长在FeO纳米岛的Fe端边，而Pt优先生长在FeO的O端边，从而导致FeO边的选择性闭塞。除了揭示FeO边不同的金属亲和力外，我们的结果还提供了对FeO/Au(111)边反应活性的新见解，并为控制FeO催化剂的选择性提供了一种途径。
The extensive research on ultrathin ferrous oxide (FeO) islands and films over the last few decades has significantly contributed to the understanding of their structural and catalytic properties. In this regard, the local chemical properties of FeO edges, such as their metal affinity, play a critical role in determining and tuning the catalytic reactivity of FeO, which however remains largely unexplored. In this work, we use scanning tunneling microscopy (STM) to study the interaction of Pd and Pt with FeO grown on Au(111). Different Fe affinities for Pd and Pt are demonstrated by the preferential growth of Pd on the Fe-terminated edge and Pt on the O-terminated edge of FeO nanoislands, resulting in selectively blocked FeO edges. In addition to revealing the different metal affinities of FeO edges, our results provide new insights into the edge reactivity of FeO/Au(111) and suggest an approach for controlling the selectivity of FeO catalysts.