NDLI: Gold nanoparticles on ceria: importance of O vacancies in the activation of gold

Content Provider	Springer Nature Link
Author	Rodriguez, J. A. Wang, X. Liu, P. Wen, W. Hanson, J. C. Hrbek, J. Pérez, M. Evans, J.
Copyright Year	2007
Abstract	Synchrotron-based techniques (high-resolution photoemission, in-situ X-ray absorption spectroscopy, and time-resolved X-ray diffraction) have been used to study the destruction of SO$_{2}$ and the water-gas shift (WGS, CO + H$_{2}$O → H$_{2}$ + CO$_{2}$) reaction on a series of gold/ceria systems. The adsorption and chemistry of SO$_{2}$ was investigated on Au/CeO$_{2}$(111) and AuO$_{ x }$/CeO$_{2}$ surfaces. The heat of adsorption of the molecule on Au nanoparticles supported on stoichiometric CeO$_{2}$(111) was 4–7 kcal/mol larger than on Au(111). However, there was negligible dissociation of SO$_{2}$ on the Au/CeO$_{2}$(111) surfaces. The full decomposition of SO$_{2}$ was observed only after introducing O vacancies in the ceria support. AuO$_{ x }$/CeO$_{2}$ surfaces were found to be much less chemically active than Au/CeO$_{2}$(111) or Au/CeO$_{2−x }$(111) surfaces. In a separate set of experiments, in-situ time-resolved X-ray diffraction and X-ray absorption spectroscopy were used to monitor the behavior of nanostructured {Au + AuO$_{ x }$}–CeO$_{2}$ catalysts under the WGS reaction. At temperatures above 250 °C, a complete AuO$_{ x }$ → Au transformation was observed with high catalytic activity. Photoemission results for the oxidation and reduction of Au nanoparticles supported on rough ceria films or a CeO$_{2}$(111) single crystal corroborate that cationic Au$^{δ+}$ species cannot be the key sites responsible for the WGS activity at high temperatures. The active sites in {Au + AuO$_{ x }$}/ceria catalysts should involve pure gold nanoparticles in contact with O vacancies of the oxide.
Starting Page	73
Ending Page	81
Page Count	9
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	44
Issue Number	1-2
e-ISSN	15729028
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	gold gold oxide ceria sulfur dioxide DeSO$_{ x }$ water-gas shift hydrogen production CO oxidation Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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