Size-selected deposition of transition metal sulfides: Insights toward model systems in catalysis

PHYS 214

Melissa J. Patterson, mpatterson@bnl.gov1, James M. Lightstone, lightstone@bnl.gov1, and Michael G. White, mgwhite@bnl.gov2. (1) Department of Chemistry, StonyBrook University, Upton, NY 11973, (2) Department of Chemistry, Brookhaven National Laboratory, Upton, NY 11973
Supported MoS2 nanoparticles have the ability to catalyze a wide array of heterogeneous reactions. Work done in our laboratory is geared towards understanding the role of size, structure and support interactions of the particles in these reactions which has not been addressed due to the inhomogeneity of commercial catalysts. The work done in our laboratory focuses on preparing monodisperse samples in ultra high vacuum that can serve as model systems for catalytic reactions. A recently constructed cluster beam apparatus uses magnetron sputtering in order to make a variety of transition metal cluster compounds. We are currently investigating the size and substrate dependent properties of these systems, in particular MoxSy+ clusters on single crystal surfaces (Au(111); Al2O3/NiAl(110)). Characterization of the clusters were carried out using techniques such as Auger, photoemission spectroscopy, and thermal desorption. Preliminary work on the reactivity of these clusters with small sulfur containing molecules will also be discussed.