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Published Online August 26, 2004
Science DOI: 10.1126/science.1102420

Reports

Submitted on July 7, 2004
Accepted on August 16, 2004

The Structure of Catalytically Active Au on Titania

M. S. Chen 1 and D. W. Goodman 1*

1 Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA.

* To whom correspondence should be addressed.
D. W. Goodman , E-mail: goodman{at}mail.chem.tamu.edu

The high catalytic activity of gold clusters on transition metal oxides has been attributed to structural effects, including particle thickness and shape, metal oxidation state, as well as to support effects. We have now created well-ordered gold monolayers and bilayers that completely wet (cover) their oxide support [a titanium oxide monolayer film grown on the Mo(112) surface], thus eliminating particle shape and direct support effects. High-resolution electron energy loss spectroscopy (HREELS) and CO adsorption confirm that the Au atoms are bonded to Ti atoms. Kinetic measurements for the catalytic oxidation of carbon monoxide show that the Au bilayer structure is significantly more active (by more than an order of magnitude) than the monolayer.


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