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Strong Metal Support Interaction as a key factor of Au activation in CO oxidation

MPS-Authors
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Klyushin,  Alexander
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Division of Energy Material, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH;

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Jones,  Travis
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Lunkenbein,  Thomas
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Kube,  Pierre
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Li,  Xuan
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Division of Energy Material, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH;
Department of Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion;

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Citation

Klyushin, A., Jones, T., Lunkenbein, T., Kube, P., Li, X., Hävecker, M., et al. (2018). Strong Metal Support Interaction as a key factor of Au activation in CO oxidation. ChemCatChem. doi:10.1002/cctc.201800972.


Cite as: https://hdl.handle.net/21.11116/0000-0001-AC5C-7
Abstract
We address the question of the nature of Au NP activation and through a combination of experimental and theoretical techniques. In‐situ XPS measurements of Au/TiO₂ during CO oxidation show high catalytic activity can be associated with the formation of an ionic Au species. DFT calculations performed on Au/TiO₂ show that the formation of such ionic Au is due to a strong metal‐support interaction between Au and reduced and defective TiO₂. TEM supports these findings, indicating the formation of an overlayer of transition metal oxide support on Au NPs after CO oxidation. These results suggest TiO₂ lattice oxygen is involved directly in CO oxidation, which was confirmed with labeled ¹⁸O₂ experiments.