Autori: Dan I. Enache, Jennifer K. Edwards, Philip Landon, Benjamin Solsona-Espriu, Albert F. Carley, Andrew A. Herzing, Masashi Watanabe, Christopher J. Kiely, David W. Knight, Graham J. Hutchings

Editorial: Science, 311, p.362-365, 2006.

Rezumat:

The oxidation of alcohols to aldehydes with O2 in place of stoichiometric oxygen donors is a crucial
process for the synthesis of fine chemicals. However, the catalysts that have been identified so far
are relatively inactive with primary alkyl alcohols. We showed that Au/Pd-TiO2 catalysts give very
high turnover frequencies (up to 270,000 turnovers per hour) for the oxidation of alcohols,
including primary alkyl alcohols. The addition of Au to Pd nanocrystals improved the overall
selectivity and, using scanning transmission electron microscopy combined with x-ray
photoelectron spectroscopy, we showed that the Au-Pd nanocrystals were made up of a Au-rich core
with a Pd-rich shell, indicating that the Au electronically influences the catalytic properties of Pd.

Cuvinte cheie: alcohol oxidation, Au-Pd catalysts

URL: http://www.sciencemag.org/cgi/reprint/311/5759/362.pdf