AVS 53rd International Symposium
    Surface Science Thursday Sessions
       Session SS1-ThM

Invited Paper SS1-ThM5
Structure and Catalytic Activity of Model Oxide Systems

Thursday, November 16, 2006, 9:20 am, Room 2002

Session: Reactivity of Oxide Surfaces I
Presenter: Z. Dohnalek, Pacific Northwest National Laboratory
Authors: O. Bondarchuk, University of Texas at Austin
Z. Zhang, University of Texas at Austin
J. Kim, Pacific Northwest National Laboratory
J.M. White, University of Texas at Austin
B.D. Kay, Pacific Northwest National Laboratory
Z. Dohnalek, Pacific Northwest National Laboratory
Correspondent: Click to Email
The rutile form of titania, and particularly the [110] surface has become the prototypical substrate for studies of model system metal oxide surface chemistry. We combined atomically resolved imaging and ensemble averaged techniques to examine the adsorption, dissociation, and partial oxidation of alcohols on TiO@sub 2@(110) and (WO@sub 3@)@sub 3@/TiO@sub 2@(110) model catalysts. On clean TiO@sub 2@(110) the images obtained from the same area before and after adsorption show that alcohols adsorb preferentially on oxygen vacancies and that their dissociation occurs via O-H bond scission. The dynamics of proton diffusion was examined as a function of alcohol coverage. Model (WO@sub 3@)@sub 3@/TiO@sub 2@(110) systems were prepared using direct sublimation of WO@sub 3@ and characterized using high resolution Scanning Tunneling Microscopy, X-ray photoelectron spectroscopy and N@sub 2@ physisorption. Reactivity studies of this system towards alcohol dehydration and formaldehyde polymerization have been carried out in an ensemble averaged manner using molecular beam scattering and temperature programmed desorption techniques. @FootnoteText@ Pacific Northwest National Laboratory is operated for the Department of Energy by Battelle under Contract DE-AC06-76RLO 1830.