Onset of catalytic activity of gold clusters on titania with the appearance of nonmetallic properties

@article{Valden1998OnsetOC,
  title={Onset of catalytic activity of gold clusters on titania with the appearance of nonmetallic properties},
  author={Valden and Lai and Goodman},
  journal={Science},
  year={1998},
  volume={281 5383},
  pages={
          1647-50
        }
}
Gold clusters ranging in diameter from 1 to 6 nanometers have been prepared on single crystalline surfaces of titania in ultrahigh vacuum to investigate the unusual size dependence of the low-temperature catalytic oxidation of carbon monoxide. Scanning tunneling microscopy/spectroscopy (STM/STS) and elevated pressure reaction kinetics measurements show that the structure sensitivity of this reaction on gold clusters supported on titania is related to a quantum size effect with respect to the… 
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References

SHOWING 1-10 OF 14 REFERENCES
CHARACTERIZATION OF METAL CLUSTERS (PD AND AU) SUPPORTED ON VARIOUS METAL OXIDE SURFACES (MGO AND TIO2)
Au clusters supported on the TiO2(001)/Mo(100) surface and Pd clusters supported on the MgO(100)/Mo(100) surface have been studied using temperature programmed desorption, ion scattering
Low-Temperature Oxidation of CO over Gold Supported on TiO2, α-Fe2O3, and Co3O4
Abstract Gold can be highly dispersed on a variety of metal oxides by coprecipitation and deposition-precipitation followed by calcination in air. The small gold particles are hemispherical in shape
The influence of the preparation methods on the catalytic activity of platinum and gold supported on TiO2 for CO oxidation
The influence of the preparation methods on the catalytic activity for CO oxidation was markedly large for Au-TiO2 and negligible for Pt-TiO2 catalysts. Platinum and gold were deposited on TiO2 by
Scanning tunneling microscopy studies of the TiO 2 ( 110 ) surface: Structure and the nucleation growth of Pd
The surface structure of TiO 2~110! has been reexamined using scanning tunneling microscopy ~STM!, especially in terms of its temperature dependency. A dramatic topographic change was observed around
Ultrathin metal films on a metal oxide surface: Growth of Au on TiO 2 (110)
We have studied the growth of ultrathin Au films on the ${\mathrm{TiO}}_{2}$ (110) surface using low-energy ion scattering (LEIS), x-ray photoelectron spectroscopy (XPS), and low-energy electron
...
1
2
...