Spectroscopic observation of dual catalytic sites during oxidation of CO on a Au/TiO 2 catalyst

Isabel Xiaoye Green, Wenjie Tang, Matthew Neurock, John T. Yates

Research output: Contribution to journalArticlepeer-review

700 Scopus citations

Abstract

The prevailing view of CO oxidation on gold-titanium oxide (Au/TiO 2) catalysts is that the reaction occurs on metal sites at the Au/TiO 2 interface. We observed dual catalytic sites at the perimeter of 3-nanometer Au particles supported on TiO 2 during CO oxidation. Infrared-kinetic measurements indicate that O-O bond scission is activated by the formation of a CO-O 2 complex at dual Ti-Au sites at the Au/TiO 2 interface. Density functional theory calculations, which provide the activation barriers for the formation and bond scission of the CO-O 2 complex, confirm this model as well as the measured apparent activation energy of 0.16 electron volt. The observation of sequential delivery and reaction of CO first from TiO 2 sites and then from Au sites indicates that catalytic activity occurs at the perimeter of Au nanoparticles.

Original languageEnglish (US)
Pages (from-to)736-739
Number of pages4
JournalScience
Volume333
Issue number6043
DOIs
StatePublished - Aug 5 2011

Fingerprint

Dive into the research topics of 'Spectroscopic observation of dual catalytic sites during oxidation of CO on a Au/TiO <sub>2</sub> catalyst'. Together they form a unique fingerprint.

Cite this