Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 14, Issue 34, Pages 10595-10602Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200801199
Keywords
CO oxidation; gold; nanostructures; structure-activity relationships; supported catalysts
Categories
Funding
- National Natural Science Foundation of China [20503027]
- Chinese Academy of Sciences
- PCSIRT [IRT0756]
- MPG-GAS
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Large An nanoparticles with an average size of approximately 10 nm supported on inert SiO2 become active in low-temperature CO oxidation after the addition of NaNO3. The catalyst structures have been characterized in detail by X-ray diffraction. X-ray photoelectron spectroscopy, transmission electron microscopy, and X-ray absorption spectroscopy. The NaNO3 additive in Au/SiO2 catalysts does not lead to the formation of fine An nanoparticles, which are generally considered to be inevitable in low-temperature CO oxidation catalyzed by gold, nor does it alter the electronic structure of Au. The NaNO3-induced restructuring of large Au nanoparticles was proposed to create low-coordinated Au sites on the surface capable of catalyzing low-temperature CO oxidation. These results experimentally prove that the activity of supported Au nanoparticles in low-temperature CO oxidation could solely arise from their geometric structure, which greatly deepens the fundamental understandings of Au nanocatalysis.
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