The Promotional Effect of Gold in Catalysis by Palladium-Gold-Reference-Cited by-同舟云学术

The Promotional Effect of Gold in Catalysis by Palladium-Gold

Published:2005-10-14 Issue:5746 Volume:310 Page:291-293
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Chen Mingshu¹,Kumar Dheeraj¹,Yi Cheol-Woo¹,Goodman D. Wayne¹

Affiliation:

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

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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