催化作用
密度泛函理论
过渡金属
氧化态
金属
化学
不饱和度
材料科学
物理化学
结晶学
多相催化
Atom(片上系统)
计算化学
有机化学
计算机科学
嵌入式系统
作者
Yanyang Qin,Yaqiong Su
出处
期刊:Chemcatchem
[Wiley]
日期:2021-06-14
卷期号:13 (17): 3857-3863
被引量:28
标识
DOI:10.1002/cctc.202100643
摘要
Abstract Understanding strong metal‐support interactions is crucially important for developing atom‐efficient transition metal heterogeneous catalysts. Herein, we performed a density functional theory study of highly dispersed Pt on CeO 2 (110). Various surface models are compared in terms of thermodynamic stability, electronic properties and energy diagrams for CO oxidation. Pt prefers square‐planar oxygen coordination in all models with a +2 state. The structures with a single Pt atom exhibit a low CO oxidation activity. A higher activity is predicted by replacement of a surface Ce by two Pt atoms. The high activity of this highly stable structure stems from the coordinative unsaturation of one of the Pt atoms and the presence of a neighboring two‐fold O atom. The CO oxidation occurs via a Mars‐van Krevelen mechanism. A compared to single‐atom catalysts based on Pt in interaction with CeO 2 (111) emphasizes the strong dependence of catalytic activity on the ceria surface termination.
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