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Issue 14, 2008
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Au–Pd supported nanocrystals prepared by a sol immobilisation technique as catalysts for selective chemical synthesis

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Abstract

Catalysis by gold and gold–palladium nanoparticles has attracted significant research attention in recent years. These nanocrystalline materials have been found to be highly effective for selective and total oxidation, but in most cases the catalysts are prepared using precipitation or impregnation. We report the preparation of Au–Pd nanocrystalline catalysts supported on carbon prepared via a sol-immobilisation technique and these have been compared with Au–Pd catalysts prepared via impregnation. The catalysts have been evaluated for two selective chemical syntheses, namely, oxidation of benzyl alcohol and the direct synthesis of hydrogen peroxide. The catalysts have been structurally characterised using a combination of scanning transmission electron microscopy and X-ray photoelectron spectroscopy. The catalysts prepared using the sol immobilisation technique show higher activity when compared with catalysts prepared by impregnation as they are more active for both hydrogen peroxide synthesis and hydrogenation, and also for benzyl alcohol oxidation. The method facilitates the use of much lower metal concentrations which is a key feature in catalyst design, particularly for the synthesis of hydrogen peroxide.

Graphical abstract: Au–Pd supported nanocrystals prepared by a sol immobilisation technique as catalysts for selective chemical synthesis

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Publication details

The article was received on 14 Dec 2007, accepted on 23 Jan 2008 and first published on 18 Feb 2008


Article type: Paper
DOI: 10.1039/B719345A
Citation: Phys. Chem. Chem. Phys., 2008,10, 1921-1930
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    Au–Pd supported nanocrystals prepared by a sol immobilisation technique as catalysts for selective chemical synthesis

    J. A. Lopez-Sanchez, N. Dimitratos, P. Miedziak, E. Ntainjua, J. K. Edwards, D. Morgan, A. F. Carley, R. Tiruvalam, C. J. Kiely and G. J. Hutchings, Phys. Chem. Chem. Phys., 2008, 10, 1921
    DOI: 10.1039/B719345A

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