Ueli Heiz and Wolf-Dieter Schneider 2000 J. Phys. D: Appl. Phys. 33 R85 doi:10.1088/0022-3727/33/11/201
Nanoassembled model catalysts
REVIEW ARTICLEUeli Heiz1,2 and Wolf-Dieter Schneider1
Show affiliationsREVIEW ARTICLE
The present review outlines, on the basis of specific examples taken from our laboratory, the most important steps in (i) preparing supported nanoassembled model catalysts and (ii) investigating their size-dependent catalytic properties. We describe the cluster generation and present evidence for softlanding of the clusters onto solid surfaces. Subsequently, the growth and the characterization of the cluster support material, thin magnesium oxide films, are discussed, including the role of surface defects. Then the thermal stability of Cu clusters and the individual electronic structure of small Ag and Cu clusters on MgO are addressed. Finally, two examples of cluster size-dependent heterogeneous catalytic reactions are presented, (i) the cyclotrimerization of acetylene on nanoassembled Pd catalysts, and (ii) the CO oxidation on nanoassembled Au catalysts. We show experimentally and together with first-principle calculations that the interaction of such small metal clusters with the oxide surface strongly changes their catalytic properties. In contrast to large particles an additional electron in localized valence states of small clusters represents a major change. It is this charge transfer which turns inactive gold and palladium clusters into active model catalysts opening new perspectives to tune catalytic processes on the nanoscale.
- PACS
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01.30.Rr Surveys and tutorial papers; resource letters
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
68.47.Jn Clusters on oxide surfaces
68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc.
- Subjects
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Surfaces, interfaces and thin films
- Dates
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Issue 11 (7 June 2000)
Received 6 March 2000
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Nanoassembled model catalysts
Ueli Heiz and Wolf-Dieter Schneider 2000 J. Phys. D: Appl. Phys. 33 R85
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