Identification of active sites in CO oxidation and water-gas shift over supported Pt catalysts
Identification of active sites in CO oxidation and water-gas shift over supported Pt catalysts
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DOI：
10.1126/science.aac6368
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发表时间：
2015-10-09
期刊：
影响因子：
56.9
通讯作者：
Stair, Peter C.
中科院分区：
文献类型：
--
作者：
Ding, Kunlun;Gulec, Ahmet;Stair, Peter C.
催化活性中心的识别和表征是从原子水平理解催化机理和合理设计高性能多相催化剂的前提。最近的报道中的间接证据表明，铂（Pt）单原子是非常活跃的催化位点。我们证明，红外光谱可以是一种快速，方便的表征方法，直接区分和量化铂单原子的纳米粒子。此外，我们直接观察到，只有铂纳米粒子表现出活性的一氧化碳（CO）氧化和水煤气变换在低温下，而铂单原子的行为作为观众。Pt单原子催化活性的缺乏可以部分归因于CO分子的强结合。
Identification and characterization of catalytic active sites are the prerequisites for an atomic-level understanding of the catalytic mechanism and rational design of high-performance heterogeneous catalysts. Indirect evidence in recent reports suggests that platinum (Pt) single atoms are exceptionally active catalytic sites. We demonstrate that infrared spectroscopy can be a fast and convenient characterization method with which to directly distinguish and quantify Pt single atoms from nanoparticles. In addition, we directly observe that only Pt nanoparticles show activity for carbon monoxide (CO) oxidation and water-gas shift at low temperatures, whereas Pt single atoms behave as spectators. The lack of catalytic activity of Pt single atoms can be partly attributed to the strong binding of CO molecules.