纳米团簇
催化作用
色散(光学)
纳米颗粒
星团(航天器)
材料科学
烧结
化学工程
吸收(声学)
化学物理
X射线光电子能谱
金属
多相催化
纳米技术
化学
有机化学
物理
复合材料
工程类
计算机科学
光学
冶金
程序设计语言
作者
Bowen He,Xin Tao,Lina Li,Xi Liu,Liwei Chen
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-11-08
卷期号:23 (22): 10367-10373
被引量:2
标识
DOI:10.1021/acs.nanolett.3c02960
摘要
The synthesis of highly dispersed Au nanoclusters that are stable under elevated temperatures in heterogeneous catalysis is challenging. Here, we directly observe a strong metal-support interaction (SMSI)-induced dispersion of Au nanoparticles (NPs) on α-MoC using an environmentally atomically resolved secondary imaging technique. Under a realistic environment, Au NPs flatten and spread out on the α-MoC to form two-dimensional atomic layered clusters. The formed highly dispersed Au/α-MoC catalyst shows excellent stability at 600 °C for 160 h in the reverse water-gas shift reaction. The X-ray photoelectron spectrum and extended X-ray absorption fine structure results show that Au NPs gradually become low-coordination-number cluster species and lose electrons to become Auδ+; these form chemical bonds with the α-MoC support and are responsible for the dispersion behavior. This work provides an insightful understanding of dispersion behavior and promotes the rational design and synthesis of reverse sintering catalysts.
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