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High catalytic activity of Au/CeO x /TiO 2 (110) controlled by the nature of the mixed-metal oxide at the nanometer level
Open accessAbstract
Mixed-metal oxides play a very important role in many areas of chemistry, physics, materials science, and geochemistry. Recently, there has been a strong interest in understanding phenomena associated with the deposition of oxide nanoparticles on the surface of a second (host) oxide. Here, scanning tunneling microscopy, photoemission, and density-functional calculations are used to study the behavior of ceria nanoparticles deposited on a TiO 2 (110) surface. The titania substrate imposes nontypical coordination modes on the ceria nanoparticles. In the CeO x /TiO 2 (110) systems, the Ce cations adopt an structural geometry and an oxidation state (+3) that are quite different from those seen in bulk ceria or for ceria nanoparticles deposited on metal substrates. The increase in the stability of the Ce 3+ oxidation state leads to an enhancement in the chemical and catalytic activity of the ceria nanoparticles. The codeposition of ceria and gold nanoparticles on a TiO 2 (110) substrate generates catalysts with an extremely high activity for the production of hydrogen through the water–gas shift reaction (H 2 O + CO → H 2 + CO 2 ) or for the oxidation of carbon monoxide (2CO + O 2 → 2CO 2 ). The enhanced stability of the Ce 3+ state is an example of structural promotion in catalysis described here on the atomic level. The exploration of mixed-metal oxides at the nanometer level may open avenues for optimizing catalysts through stabilization of unconventional surface structures with special chemical activity.
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Cites
The surface science of titanium dioxide
Diebold, U. (2003) · Surface Science Reports · doi:10.1016/s0167-5729(02)00100-0 · Cited by 7,944
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Bruix, A., Rodriguez, J. A., Ramírez, P. J., Senanayake, S. D., Evans, J., Park, J. B., Stacchiola, D., Liu, P., Hrbek, J., & Illas, F. (2012) · Journal of the American Chemical Society · doi:10.1021/ja302070k · Cited by 839
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Dahl, M., Liu, Y., & Yin, Y. (2014) · Chemical Reviews · doi:10.1021/cr400634p · Cited by 687
Park, J. B., Graciani, J., Evans, J., Stacchiola, D., Senanayake, S. D., Barrio, L., Liu, P., Sanz, J. F., Hrbek, J., & Rodriguez, J. A. (2010) · Journal of the American Chemical Society · doi:10.1021/ja9087677 · Cited by 260
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Metadata
- Authors
- Park, J. B., Graciani, J., Evans, J., Stacchiola, D., Ma, S., Liu, P., Nambu, A., Sanz, J. F., Hrbek, J., & Rodriguez, J. A.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 2009-03-31
- Volume
- 106
- Issue
- 13
- Pages
- 4975-4980
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W2002853978
- Cited by
- 268
- References
- 1
- FWCI
- 11.48
- Type
- journal article
- Language
- en
- Open access
- green
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- Park, J. B., Graciani, J., Evans, J., Stacchiola, D., Ma, S., Liu, P., Nambu, A., Sanz, J. F., Hrbek, J., & Rodriguez, J. A. (2009). High catalytic activity of Au/CeO x /TiO 2 (110) controlled by the nature of the mixed-metal oxide at the nanometer level. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.0812604106
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