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Strong Metal Support Interaction as a Key Factor of Au Activation in CO Oxidation
Author(s) -
Klyushin Alexander Yu.,
Jones Travis E.,
Lunkenbein Thomas,
Kube Pierre,
Li Xuan,
Hävecker Michael,
KnopGericke Axel,
Schlögl Robert
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201800972
Subject(s) - overlayer , x ray photoelectron spectroscopy , ionic bonding , metal , transition metal , catalysis , oxide , oxidation state , chemistry , oxygen , inorganic chemistry , materials science , chemical engineering , ion , organic chemistry , engineering
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/TiO 2 during CO oxidation show high catalytic activity can be associated with the formation of an ionic Au species. DFT calculations performed on Au/TiO 2 show that the formation of such ionic Au is due to a strong metal‐support interaction between Au and reduced and defective TiO 2 . TEM supports these findings, indicating the formation of an overlayer of transition metal oxide support on Au NPs after CO oxidation. These results suggest TiO 2 lattice oxygen is involved directly in CO oxidation, which was confirmed with labeled 18 O 2 experiments.