High Activity of Au/γ-Fe2O3 for CO Oxidation: Effect of Support Crystal Phase in Catalyst Design

Au/γ-Fe2O3 and Au/α-Fe2O3 catalysts with identical size of Au nanoparticles, chemical state of Au species, and amount of surface OH– group were prepared. The Au/γ-Fe2O3 catalyst exhibited exceptionally high activity, regardless of the heat treatments. The CO-TPR, sequential pulse reaction, and in si...

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Bibliographic Details
Published inACS catalysis Vol. 5; no. 6; pp. 3528 - 3539
Main Authors Zhao, Kunfeng, Tang, Hailian, Qiao, Botao, Li, Lin, Wang, Junhu
Format Journal Article
LanguageEnglish
Published American Chemical Society 05.06.2015
Subjects
gold
CO oxidation
γ-Fe2O3
catalyst design
redox
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Summary:Au/γ-Fe2O3 and Au/α-Fe2O3 catalysts with identical size of Au nanoparticles, chemical state of Au species, and amount of surface OH– group were prepared. The Au/γ-Fe2O3 catalyst exhibited exceptionally high activity, regardless of the heat treatments. The CO-TPR, sequential pulse reaction, and in situ Raman spectra demonstrate that the much higher activity of Au/γ-Fe2O3 originated from its higher redox property at low temperature. Systematic study shows that this higher-redox-property-based higher activity could be extended to γ-Fe2O3-supported Pt-group metals and to other reactions that follow Mars–Van Krevelen mechanism. This finding may provide a new avenue for catalyst improvement or development by choosing the suitable crystal phase of the oxide support.
ISSN:2155-5435
2155-5435
DOI:10.1021/cs5020496