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Activity of CeO x and TiO x Nanoparticles Grown on Au(111) in the Water-Gas Shift Reaction
Abstract
The high performance of Au-CeO 2 and Au-TiO 2 catalysts in the water-gas shift (WGS) reaction (H 2 O + CO→H 2 + CO 2 ) relies heavily on the direct participation of the oxide in the catalytic process. Although clean Au(111) is not catalytically active for the WGS, gold surfaces that are 20 to 30% covered by ceria or titania nanoparticles have activities comparable to those of good WGS catalysts such as Cu(111) or Cu(100). In TiO 2- x /Au(111) and CeO 2- x /Au(111), water dissociates on O vacancies of the oxide nanoparticles, CO adsorbs on Au sites located nearby, and subsequent reaction steps take place at the metal-oxide interface. In these inverse catalysts, the moderate chemical activity of bulk gold is coupled to that of a more reactive oxide.
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Metadata
- Authors
- Rodriguez, J. A., Ma, S., Liu, P., Hrbek, J., Evans, J., & Pérez, M.
- Venue
- Science
- Published
- 2007-12-14
- Volume
- 318
- Issue
- 5857
- Pages
- 1757-1760
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2082279765
- Cited by
- 1,002
- References
- 0
- FWCI
- 18.83
- Type
- journal article
- Language
- en
- Open access
- closed
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- Rodriguez, J. A., Ma, S., Liu, P., Hrbek, J., Evans, J., & Pérez, M. (2007). Activity of CeO x and TiO x Nanoparticles Grown on Au(111) in the Water-Gas Shift Reaction. Science. https://doi.org/10.1126/science.1150038
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