Study of CO molecules on Pd/Al2O3/NiAl(110) surface by atomic force microscopy and Kelvin probe force microscopy

Reactant adsorption sites of novel metal catalysts are difficult to characterize precisely, which is vital for understanding heterogeneous reactions and designing efficient catalytic systems. However, even at cryogenic temperatures, a complete atomic understanding of catalytic reaction sites remains...

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Bibliographic Details
Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2023-07, Vol.25 (7), p.138, Article 138
Main Authors: Zou, Shanrong, Wei, Jiuyan, Zhu, Qiang, Sang, Hongqian, Sugawara, Yasuhiro, Li, Yan Jun
Format: Article
Language:English
Subjects:
Adsorption
Aluminum oxide
Atomic force microscopy
Carbon monoxide
Catalysis
Catalysts
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cryogenic temperature
Density functional theory
Dislocations
Inorganic Chemistry
Intermetallic compounds
Lasers
Materials Science
Microscopy
Nanoclusters
Nanoparticles
Nanotechnology
Nickel aluminides
Nickel base alloys
Nickel compounds
Optical Devices
Optics
Palladium
Photonics
Physical Chemistry
Research Paper
Room temperature
Surface chemistry
Temperature preferences
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Summary:Reactant adsorption sites of novel metal catalysts are difficult to characterize precisely, which is vital for understanding heterogeneous reactions and designing efficient catalytic systems. However, even at cryogenic temperatures, a complete atomic understanding of catalytic reaction sites remains elusive, such as the variation in reactant molecule adsorption sites on metal nanoclusters (NCs). Here, we studied CO adsorption on the Pd NC of an Al 2 O 3 /NiAl(110) surface with atomic resolution by noncontact atomic force microscopy and Kelvin probe force microscopy at room temperature. We found that CO molecules are preferentially adsorbed on the Pd NC (~2 nm) on line defects. We investigated the consecutive scanning topographic AFM images of CO molecules on the Pd/Al 2 O 3 /NiAl surface and found the most stable adsorption site of CO molecules on bridge site and the most unstable adsorbed site on step_110, which are supported by density functional theory (DFT) calculations. This result reveals that the electronic and geometric properties of Pd NCs and CO molecules are expected to provide insight into the mechanism of Pd-based heterogeneous catalysis. Graphical abstract
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-023-05781-8