The promotional effect of gold in catalysis by palladium-gold.
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.
Chen
Mingshu
M
Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA.
Kumar
Dheeraj
D
Yi
Cheol-Woo
CW
Goodman
D Wayne
DW