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Increasing the Number of Oxygen Vacancies on TiO 2 by Doping with Iron Increases the Activity of Supported Gold for CO Oxidation
Author(s) -
Carrettin Silvio,
Hao Yalin,
AguilarGuerrero Veronica,
Gates Bruce C.,
Trasobares Susana,
Calvino Jose J.,
Corma Avelino
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200700472
Subject(s) - nanoclusters , catalysis , anatase , rutile , oxygen , materials science , raman spectroscopy , inorganic chemistry , absorption (acoustics) , oxidation state , absorption spectroscopy , photochemistry , chemistry , nanotechnology , photocatalysis , organic chemistry , physics , quantum mechanics , optics , composite material
The addition of iron to high‐area TiO 2 (Degussa P25, a mixture of anatase and rutile) increases the number of oxygen defect sites that react with O 2 to form peroxide and superoxide species. In the presence of gold nanoclusters on the TiO 2 surface, the superoxide species become highly reactive, and the activity of the supported gold catalyst for CO oxidation is approximately twice that of the most active comparable catalysts described in the literature. Images of the catalyst obtained by scanning transmission electron microscopy combined with spectra of the catalyst measured in the working state (Raman, extended X‐ray absorption fine structure, and X‐ray absorption near‐edge structure) indicate strong interactions of gold with the support and the presence of iron near the interfaces between the gold clusters and the TiO 2 support. The high activity of the catalysts is attributed to the presence of defects in these sites that activate oxygen.