The effect of the metal to non-metal transition on the activity of gold catalysts

The problem of obtaining exact information on the particle size dependence of the rate of gold-catalysed reactions is surveyed, and it is shown to be possible that over a range of mean sizes the activity for CO oxidation is predominantly due to the fraction of particles smaller than about 2.5 nm. Th...

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Bibliographic Details
Published inFaraday discussions Vol. 152; pp. 277 - 91; discussion 293-306
Main Author Bond, Geoffrey C
Format Journal Article
LanguageEnglish
Published England 2011
Subjects
Alloy systems
Carbon monoxide
Catalysis
Catalysts
Chemisorption
Gold
Oxidation
Titanium dioxide
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Summary:The problem of obtaining exact information on the particle size dependence of the rate of gold-catalysed reactions is surveyed, and it is shown to be possible that over a range of mean sizes the activity for CO oxidation is predominantly due to the fraction of particles smaller than about 2.5 nm. This size coincides with the point at which transition from metallic to non-metallic or 'molecular' behaviour is expected, and means of describing the electronic structure of the microparticles is considered. This transition may be the cause of enhanced and activated chemisorption of the CO molecule. Analysis of results for the rate dependence on size for CO oxidation on Au/TiO2 catalysts by the compensation relation confirms the importance of the transition. It is also held responsible for the ability of the PtAu system to form small homogeneous alloy particles.
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ISSN:1359-6640
1364-5498
DOI:10.1039/c1fd00010a