催化作用
反应性(心理学)
Atom(片上系统)
铂金
吸附
材料科学
金属
氧化态
氧化还原
结晶学
化学
物理化学
计算机科学
冶金
有机化学
嵌入式系统
病理
替代医学
医学
作者
Zihao Zhang,Jinshu Tian,Yubing Lu,Shize Yang,Dong Jiang,Weixin Huang,Yixiao Li,Jiyun Hong,Adam S. Hoffman,Simon R. Bare,Mark Engelhard,Abhaya K. Datye,Yong Wang
标识
DOI:10.1038/s41467-023-37776-3
摘要
Abstract Single atoms of platinum group metals on CeO 2 represent a potential approach to lower precious metal requirements for automobile exhaust treatment catalysts. Here we show the dynamic evolution of two types of single-atom Pt (Pt 1 ) on CeO 2 , i.e., adsorbed Pt 1 in Pt/CeO 2 and square planar Pt 1 in Pt AT CeO 2 , fabricated at 500 °C and by atom-trapping method at 800 °C, respectively. Adsorbed Pt 1 in Pt/CeO 2 is mobile with the in situ formation of few-atom Pt clusters during CO oxidation, contributing to high reactivity with near-zero reaction order in CO. In contrast, square planar Pt 1 in Pt AT CeO 2 is strongly anchored to the support during CO oxidation leading to relatively low reactivity with a positive reaction order in CO. Reduction of both Pt/CeO 2 and Pt AT CeO 2 in CO transforms Pt 1 to Pt nanoparticles. However, both catalysts retain the memory of their initial Pt 1 state after reoxidative treatments, which illustrates the importance of the initial single-atom structure in practical applications.
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