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
-
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
-
Surfaces, interfaces and thin films
- Dates
-
Issue 11 (7 June 2000)
Received 6 March 2000
-
Nanoassembled model catalysts
Ueli Heiz and Wolf-Dieter Schneider 2000 J. Phys. D: Appl. Phys. 33 R85
-
SANEPIC: A Mapmaking Method for Time Stream Data from Large Arrays
G. Patanchon et al. 2008 ApJ 681 708
-
Classical simulations of the properties of group-III nitrides
J A Chisholm et al 1999 J. Phys.: Condens. Matter 11 L235
-
A measure of data collapse for scaling
Somendra M Bhattacharjee and Flavio Seno 2001 J. Phys. A: Math. Gen. 34 6375
-
Chandra X-Ray Observation of the Orion Nebula Cluster. II. Relationship between X-Ray Activity Indicators and Stellar Parameters
E. Flaccomio et al. 2003 ApJ 582 398
-
Vanishing scalar invariant spacetimes in higher dimensions
A Coley et al 2004 Class. Quantum Grav. 21 5519
-
A crisis in the dissipative Fermi accelerator model
Edson D Leonel and P V E McClintock 2005 J. Phys. A: Math. Gen. 38 L425
-
Band gaps and asymptotic behaviour of continued fraction coefficients
P Turchi et al 1982 J. Phys. C: Solid State Phys. 15 2891
-
Submillimeter Array 12CO (J = 3-2) Interferometric Observations of the Central Region of M51
Satoki Matsushita et al 2004 ApJ 616 L55
-
Interactively variable isotropic resolution in computed tomography
Robert M Lapp et al 2008 Phys. Med. Biol. 53 2693
Users also read
What's this?- Spin pumping in Co56Fe24B20 multilayer systems
- Properties of Fe/MgO (1 0 0) nanometric films grown by dc sputtering
- Cluster assembled materials: a novel class of nanostructured solids with original structures and properties
