AVS 52nd International Symposium
    Surface Science Wednesday Sessions
       Session SS2-WeA

Paper SS2-WeA1
Physical and Chemical Properties of Model Catalysts Prepared by Size-Selected Cluster Deposition

Wednesday, November 2, 2005, 2:00 pm, Room 203

Session: Reactions on Nanoclusters
Presenter: T. Wu, University of Utah
Authors: T. Wu, University of Utah
S. Lee, University of Utah
C. Fan, University of Utah
W. Kaden, University of Utah
S.L. Anderson, University of Utah
Correspondent: Click to Email
In surface chemistry, one of the most important goals is to understand the relationship between surface structure and catalyst reactivity, especially at an atomic level. An interesting aspect of this field is the effect of particle size in supported catalysts, i.e., how cluster size affects the physical properties of the surface, as well as the activity for specific reactions. In our lab, model gold, iridium, and palladium catalysts were prepared by deposition of size-selected metal clusters on well defined oxide surfaces, and characterized by a combination of X-ray photoelectron spectroscopy (XPS), ion scattering spectroscopy (ISS), temperature-programmed desorption, and pulse-dosing mass spectrometry. Activity is strongly size-dependent. For example, in reaction of hydrazine on Ir/alumina model catalysts, both activity, and the distribution of products change dramatically with cluster size. Strong dependence on size is also seen for CO oxidation.