Electronic Structure Controls Reactivity of Size-Selected Pd Clusters Adsorbed on TiO2 Surfaces. Kaden, W. E., Wu, T., Kunkel, W. A., & Anderson, S. L. Science, 326(5954):826–829, November, 2009.
Electronic Structure Controls Reactivity of Size-Selected Pd Clusters Adsorbed on TiO2 Surfaces [link]Paper  doi  abstract   bibtex   
The catalytic activity of metal clusters of different sizes adsorbed on oxide surfaces can be explored systematically by using model catalysts. We studied the temperature-programmed reaction of CO with O2 catalyzed by Pd clusters (Pdn, for n = 1, 2, 4, 7, 10, 16, 20, and 25) that were size-selected in the gas phase and deposited on rutile TiO2(110). X-ray photoemission spectroscopy revealed that the Pd 3d binding energy varied nonmonotonically with cluster size and that the changes correlated with strong size variations in CO oxidation activity. Taking final-state effects into account, low activity was correlated with higher-than-expected Pd 3d binding energy, which is attributed to a particularly stable valence electronic structure; electron transfer from the TiO2 support to the Pd clusters also occurs. Ion scattering shows that small clusters form single-layer islands on the surface and that formation of a second layer begins to occur for clusters larger than Pd10.
@article{kaden_electronic_2009,
	title = {Electronic {Structure} {Controls} {Reactivity} of {Size}-{Selected} {Pd} {Clusters} {Adsorbed} on {TiO2} {Surfaces}},
	volume = {326},
	url = {http://www.sciencemag.org/cgi/content/abstract/326/5954/826},
	doi = {10.1126/science.1180297},
	abstract = {The catalytic activity of metal clusters of different sizes adsorbed on oxide surfaces can be explored systematically by using model catalysts. We studied the temperature-programmed reaction of CO with O2 catalyzed by Pd clusters (Pdn, for n = 1, 2, 4, 7, 10, 16, 20, and 25) that were size-selected in the gas phase and deposited on rutile TiO2(110). X-ray photoemission spectroscopy revealed that the Pd 3d binding energy varied nonmonotonically with cluster size and that the changes correlated with strong size variations in CO oxidation activity. Taking final-state effects into account, low activity was correlated with higher-than-expected Pd 3d binding energy, which is attributed to a particularly stable valence electronic structure; electron transfer from the TiO2 support to the Pd clusters also occurs. Ion scattering shows that small clusters form single-layer islands on the surface and that formation of a second layer begins to occur for clusters larger than Pd10.},
	number = {5954},
	urldate = {2009-12-01},
	journal = {Science},
	author = {Kaden, William E. and Wu, Tianpin and Kunkel, William A. and Anderson, Scott L.},
	month = nov,
	year = {2009},
	pages = {826--829},
}

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