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CO adsorption on a Au/CeO2 (111) model catalyst

Weststrate, C J; Resta, Andrea LU ; Westerström, Rasmus LU ; Lundgren, Edvin LU ; Mikkelsen, Anders LU and Andersen, Jesper N LU (2008) In Journal of Physical Chemistry C 112(17). p.6900-6906
Abstract
We prepared a Au/CeO2 (111) model catalyst by depositing a thin cerium oxide film on a Ru(0001) surface and subsequently depositing gold. This model system was investigated using high-resolution photoemission spectroscopy. Gold forms metallic nanoparticles on CeO2 with an average particle size that depends on the Au dose. At 80 K adsorption of CO was observed on the supported Au particles, which induces a chemical shift of +0.9 eV in the An 4f level of the An atoms directly involved in the Au-CO bond. CO adsorption also induces an additional, particle-size-dependent shift, which affects all Au atoms in the particle; i.e., the whole Au particle is affected by CO adsorption. The fraction of surface atoms involved in CO bonding decreases with... (More)
We prepared a Au/CeO2 (111) model catalyst by depositing a thin cerium oxide film on a Ru(0001) surface and subsequently depositing gold. This model system was investigated using high-resolution photoemission spectroscopy. Gold forms metallic nanoparticles on CeO2 with an average particle size that depends on the Au dose. At 80 K adsorption of CO was observed on the supported Au particles, which induces a chemical shift of +0.9 eV in the An 4f level of the An atoms directly involved in the Au-CO bond. CO adsorption also induces an additional, particle-size-dependent shift, which affects all Au atoms in the particle; i.e., the whole Au particle is affected by CO adsorption. The fraction of surface atoms involved in CO bonding decreases with increasing gold particle size, from similar to 60-70% for small particles to 15-20% for large particles. It is concluded that CO only adsorbs on defects (low-coordinated Au atoms). The CO desorption temperature decreases with increasing particle size. This is explained as follows: on small particles the most abundant defects are corner atoms and kinks (6-coordinated), which interact strongly with CO. On large particles the most abundant defects are edges between two planes (7-coordinated), which interact less strongly with CO. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
112
issue
17
pages
6900 - 6906
publisher
The American Chemical Society
external identifiers
  • wos:000255292400043
  • scopus:44349093849
ISSN
1932-7447
DOI
10.1021/jp7117482
language
English
LU publication?
yes
id
f64d0ff7-72d7-4bf8-9cbf-32e0a20c8d4e (old id 1205284)
date added to LUP
2008-09-18 14:06:23
date last changed
2017-01-01 04:44:54
@article{f64d0ff7-72d7-4bf8-9cbf-32e0a20c8d4e,
  abstract     = {We prepared a Au/CeO2 (111) model catalyst by depositing a thin cerium oxide film on a Ru(0001) surface and subsequently depositing gold. This model system was investigated using high-resolution photoemission spectroscopy. Gold forms metallic nanoparticles on CeO2 with an average particle size that depends on the Au dose. At 80 K adsorption of CO was observed on the supported Au particles, which induces a chemical shift of +0.9 eV in the An 4f level of the An atoms directly involved in the Au-CO bond. CO adsorption also induces an additional, particle-size-dependent shift, which affects all Au atoms in the particle; i.e., the whole Au particle is affected by CO adsorption. The fraction of surface atoms involved in CO bonding decreases with increasing gold particle size, from similar to 60-70% for small particles to 15-20% for large particles. It is concluded that CO only adsorbs on defects (low-coordinated Au atoms). The CO desorption temperature decreases with increasing particle size. This is explained as follows: on small particles the most abundant defects are corner atoms and kinks (6-coordinated), which interact strongly with CO. On large particles the most abundant defects are edges between two planes (7-coordinated), which interact less strongly with CO.},
  author       = {Weststrate, C J and Resta, Andrea and Westerström, Rasmus and Lundgren, Edvin and Mikkelsen, Anders and Andersen, Jesper N},
  issn         = {1932-7447},
  language     = {eng},
  number       = {17},
  pages        = {6900--6906},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {CO adsorption on a Au/CeO2 (111) model catalyst},
  url          = {http://dx.doi.org/10.1021/jp7117482},
  volume       = {112},
  year         = {2008},
}