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The structure of gold clusters of different sizes supported on various metal oxides (Al 2 O 3 , TiO 2 , SiO 2 ) exposed to different CO oxidation conditions was investigated in situ using X-ray absorption spectroscopy at the Au L 3 edge. In all catalysts, the only phase detected during catalysis was Au 0 . In the most active sample with small gold particles...
Au catalysts with different metallic particle sizes and supported on silica, alumina, titania, zirconia, ceria, and niobia were prepared, and the reduced catalysts were characterized by EXAFS spectroscopy. As the AuAu coordination number decreased, the interatomic bond length decreased. The AuAu bond length contraction appears to be independent of the support type. A correlation between the dispersion...
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