Identification of Active Gold Nanoclusters on Iron Oxide Supports for CO Oxidation

American Association for the Advancement of Science (AAAS) - Tập 321 Số 5894 - Trang 1331-1335 - 2008
Andrew A. Herzing1,2,3, Christopher J. Kiely1,2,3, Albert F. Carley1,4,3, Philip Landon1,4,3, Graham J. Hutchings1,4,3
1Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff CF10 3AT, UK
2Center for Advanced Materials and Nanotechnology, Lehigh University, 5 East Packer Avenue, Bethlehem, PA 18015-3195, USA
3National Institute of Standards and Technology, Surface and Microanalysis Science Division, 100 Bureau Drive, Mailstop 8371, Gaithersburg, MD 20899–8371, USA.
4Center for Advanced Materials and Nanotechnology, Lehigh University, 5 East Packer Avenue, Bethlehem, PA 18015–3195, USA.

Tóm tắt

Gold nanocrystals absorbed on metal oxides have exceptional properties in oxidation catalysis, including the oxidation of carbon monoxide at ambient temperatures, but the identification of the active catalytic gold species among the many present on real catalysts is challenging. We have used aberration-corrected scanning transmission electron microscopy to analyze several iron oxide–supported catalyst samples, ranging from those with little or no activity to others with high activities. High catalytic activity for carbon monoxide oxidation is correlated with the presence of bilayer clusters that are ∼0.5 nanometer in diameter and contain only ∼10 gold atoms. The activity of these bilayer clusters is consistent with that demonstrated previously with the use of model catalyst systems.

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We thank the Athena project of the Engineering and Physical Sciences Research Council NSF NASA and the National Research Council Postdoctoral Associate program for funding this work.

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American Association for the Advancement of Science (AAAS)

Tập 321 Số 5894

1331-1335

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