Web Release Date: January 25,
High-Temperature-Stable Au@SnO2 Core/Shell Supported Catalyst for CO Oxidation
Department of Nanomaterials and Nanochemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
Received: December 18, 2007
In Final Form: January 14, 2008
Abstract:
High-temperature-stable Au@SnO2 core/shell supported catalyst was prepared by a simple intermetallics-based dry-oxidation approach in which the size of the core can be controlled easily by varying the size of the pre-made Au seeds. The change of their structure was investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). In the as-prepared supported catalysts, Au particles with a mean size of ca. 15 nm were highly encapsulated by the SnO2 shell. Moreover, the Au@SnO2 core/shell supported catalysts showed superior catalytic activity compared to non-encapsulated Au-SnO2. XPS spectra showed that the interactions between the Au catalyst and oxide support in the well-encapsulated Au@SnO2 core/shell nanoparticles are much stronger than those in the non-encapsulated Au-SnO2 nanoparticles, further indicating the synergetic confinement effect in such nanoscaled catalyst/support core/shell systems.
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