一氧化碳
催化作用
胶体金
纳米颗粒
化学物理
透射电子显微镜
材料科学
粒径
纳米技术
化学工程
氧气
化学
物理化学
有机化学
工程类
作者
Yang He,Jincheng Liu,Langli Luo,Yang−Gang Wang,Junfa Zhu,Yingge Du,Jun Li,Scott X. Mao,Chongmin Wang
标识
DOI:10.1073/pnas.1800262115
摘要
Significance Gold is the noblest metal. However, when the size decreases to nanoscale and is supported on reducible oxides, the gold nanoparticle shows exceptionally high catalytic performance even at low temperatures. Here, through state-of-the-art in situ aberration-corrected environmental transmission electron microscopy and ab initio molecular-dynamic simulations, we discovered that, upon exposing to reactant gas (carbon monoxide and oxygen), ultrasmall gold clusters on ceria show a size-dependent order-to-disorder transformation with generation of dynamic low-coordinated atoms, which presumably can effectively boost the oxidation reaction of carbon monoxide. The findings provide much-needed insights on the origin of size-dependent catalytic properties of supported gold and demonstrate a size effect in absorbent–particle interactions that may widely exist and play an essential role in heterogeneous catalysts.
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