Model catalysts of supported Au nanoparticles and mass-selected clusters

In surface science, much effort has gone into obtaining a deeper understanding of the size-selectivity of nanocatalysts. In this article, electronic and chemical properties of various model catalysts consisting of Au are reported. Au supported by oxide surfaces becomes inert towards chemisorption an...

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Published inPCCP. Physical chemistry chemical physics (Print) Vol. 12; no. 46; pp. 15172 - 15180
Main Authors LIM, Dong-Chan, HWANG, Chan-Cuk, GANTEFÖR, Gerd, YOUNG DOK KIM
Format Conference Proceeding Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 14.12.2010
Subjects
Catalysis
Catalysts
Chemisorption
Chemistry
Clusters
Colloidal state and disperse state
Electrochemistry
Exact sciences and technology
General and physical chemistry
Gold
Nanoparticles
Nanostructure
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Study of interfaces
Surface chemistry
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Chemisorption
Particle size
Electronic properties
Nanoparticle
Oxides
Selectivity
Substrate
Electrochemistry
Models
Oxidation
Chemical properties
Charge transfer
Catalyst
Electrons
Catalyst support
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Summary:In surface science, much effort has gone into obtaining a deeper understanding of the size-selectivity of nanocatalysts. In this article, electronic and chemical properties of various model catalysts consisting of Au are reported. Au supported by oxide surfaces becomes inert towards chemisorption and oxidation as the particle size became smaller than a critical size (2-3 nm). The inertness of these small Au nanoparticles is due to the electron-deficient nature of smaller Au nanoparticles, which is a result of metal-substrate charge transfer. Properties of Au clusters smaller than ∼20 atoms were shown to be non-scalable, i.e., every atom can drastically change the chemical properties of the clusters. Moreover, clusters with the same size can show dissimilar properties on various substrates. These recent endeavours show that the activity of a catalyst can be tuned by varying the substrate or by varying the cluster size on an atom-by-atom basis.
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ISSN:1463-9076
1463-9084
DOI:10.1039/c0cp00467g