双金属片
纳米颗粒
催化作用
乙炔
价(化学)
金属
化学物理
Atom(片上系统)
晶体结构
离解(化学)
选择性
再分配(选举)
化学
立方晶系
Crystal(编程语言)
材料科学
结晶学
纳米技术
物理化学
有机化学
程序设计语言
政治
计算机科学
政治学
嵌入式系统
法学
作者
Shuang Liu,Yong Li,Xiaojuan Yu,Shaobo Han,Yan Zhou,Yuqi Yang,Hao Zhang,Zheng Jiang,Chengshen Zhu,Wei‐Xue Li,Christof Wöll,Yuemin Wang,Wenjie Shen
标识
DOI:10.1038/s41467-022-32274-4
摘要
Bimetallic nanoparticles afford geometric variation and electron redistribution via strong metal-metal interactions that substantially promote the activity and selectivity in catalysis. Quantitatively describing the atomic configuration of the catalytically active sites, however, is experimentally challenged by the averaging ensemble effect that is caused by the interplay between particle size and crystal-phase at elevated temperatures and under reactive gases. Here, we report that the intrinsic activity of the body-centered cubic PdCu nanoparticle, for acetylene hydrogenation, is one order of magnitude greater than that of the face-centered cubic one. This finding is based on precisely identifying the atomic structures of the active sites over the same-sized but crystal-phase-varied single-particles. The densely-populated Pd-Cu bond on the chemically ordered nanoparticle possesses isolated Pd site with a lower coordination number and a high-lying valence d-band center, and thus greatly expedites the dissociation of H2 over Pd atom and efficiently accommodates the activated H atoms on the particle top/subsurfaces.
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