Identification of Surface Sites for Low-Temperature Heterogeneously Catalyzed CO Oxidation on Rh(111)
Identification of Surface Sites for Low-Temperature Heterogeneously Catalyzed CO Oxidation on Rh(111)
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DOI：
10.1021/acscatal.8b03887
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发表时间：
2018-11
期刊：
影响因子：
12.9
通讯作者：
R. G. Farber;Marie E. Turano;D. R. Killelea
中科院分区：
文献类型：
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作者：
R. G. Farber;Marie E. Turano;D. R. Killelea
在多相催化的金属表面氧化反应中，有利的含氧物种提供了较低的势垒反应途径。为了更好地利用这种反应，必须了解存在什么物种，它们是如何形成的，以及它们在什么条件下可以进行反应。氧化物、吸附氧和亚表面氧都形成在Rh(111)表面，因此提供了区分每个物种对整体反应活性的贡献的机会。扫描隧道显微镜(STM)和程序升温脱附(TPD)相结合的结果表明，当表面下有氧存在时，CO在相对温和的温度下很容易在金属相和氧化相之间的界面上被氧化。
In heterogeneously catalyzed oxidation reactions on metal surfaces, advantageous oxygenaceous species proffer lower barrier reaction pathways. In order to utilize such reactions better, it is essential to understand what species are present, how they are formed, and under what conditions they are available for reaction. Oxides, adsorbed oxygen, and subsurface oxygen each form on Rh(111) surfaces and thus provide the opportunity to distinguish the contributions of each species to the overall reactivity. In an effort to elucidate relevant reaction sites on catalytically active rhodium surfaces, a combination of scanning tunneling microscopy (STM) and temperature-programmed desorption (TPD) showed that when subsurface oxygen is present, CO was readily oxidized at the interface between the metallic and oxidic phases at relatively modest temperatures.