CO adsorption on a Au/CeO2 (111) model catalyst
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1205284
- author
- Weststrate, C J ; Resta, Andrea LU ; Westerström, Rasmus LU ; Lundgren, Edvin LU ; Mikkelsen, Anders LU and Andersen, Jesper N LU
- organization
- publishing date
- 2008
- 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 (ACS)
- 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
- 2016-04-01 12:00:25
- date last changed
- 2022-01-26 21:28:25
@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 (ACS)}}, series = {{Journal of Physical Chemistry C}}, title = {{CO adsorption on a Au/CeO2 (111) model catalyst}}, url = {{http://dx.doi.org/10.1021/jp7117482}}, doi = {{10.1021/jp7117482}}, volume = {{112}}, year = {{2008}}, }