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Science 14 October 2005:
Vol. 310. no. 5746, pp. 291 - 293
DOI: 10.1126/science.1115800
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Reports

The Promotional Effect of Gold in Catalysis by Palladium-Gold

Mingshu Chen, Dheeraj Kumar, Cheol-Woo Yi, D. Wayne Goodman*

Acetoxylation of ethylene to vinyl acetate (VA) was used to investigate the mechanism of the promotional effect of gold (Au) in a palladium (Pd)-Au alloy catalyst. The enhanced rates of VA formation for low Pd coverages relative to high Pd coverages on Au single-crystal surfaces demonstrate that the critical reaction site for VA synthesis consists of two noncontiguous, suitably spaced, Pd monomers. The role of Au is to isolate single Pd sites that facilitate the coupling of critical surface species to product, while inhibiting the formation of undesirable reaction by-products.

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

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

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Science. ISSN 0036-8075 (print), 1095-9203 (online)