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Gold-palladium nanoparticles for the selective oxidation of carbon-hydrogen bonds

14 January 2011

Gold-palladium nanoparticles for the selective oxidation of carbon-hydrogen bonds

Work recently published in Science, from the group of Professor Graham Hutchings, shows how gold-palladium nanoparticles can be used for the highly selective oxidation of the C-H bond in toluene. Depending on the reaction conditions, high yields were obtained for the formation of benzyl benzoate, which is an important precursor to a wide variety of fine chemicals. This reaction is extremely attractive, since the use molecular oxygen as the oxidant, and proceed in the absence of solvent.

Solvent-free Oxidation of Primary Carbon-Hydrogen Bonds in Toluene Using Au-Pd Alloy Nanoparticles, L. Kesavan, R. Tiruvalam, M. H. Ab Rahim, M. I. bin Saiman, D. I. Enache, R. L. Jenkins, N. Dimitratos, J. A. Lopez-Sanchez, S. H. Taylor, D. W. Knight, C. J. Kiely and G. J. Hutchings, Science, 2011, 331, 195. DOI: 10.1126/science.1198458

In related news, the same group’s work on room-temperature cleavage of the C-O bond in carbon monoxide has been highlighted in Chemistry World (January 2011, page 26). This work, published in Physical Chemistry Chemical Physics shows that gold supported on iron oxide can be effective for the dissociation of the carbon oxygen bond in carbon monoxide, which is the strongest diatomic bond, as a minor pathway in the oxidation of carbon monoxide to carbon dioxide. This effect is not observed for gold nanoparticles supported on zinc oxide.

CO bond cleavage on supported nano-gold during low temperature oxidation, Albert F. Carley, David J. Morgan, Nianxue Song, M. Wyn Roberts, Stuart H. Taylor, Jonathan K. Bartley, David J. Willock, Kara L. Howard and Graham J. Hutchings, Phys. Chem. Chem. Phys., 2011, Advance Article, DOI: 10.1039/C0CP01852J

 

Gold-palladium nanoparticles