AVS 47th International Symposium
    Surface Science Wednesday Sessions
       Session SS-WeP

Paper SS-WeP17
CO Adsorption on Au{110} and Au/TiO@sub 2@

Wednesday, October 4, 2000, 11:00 am, Room Exhibit Hall C & D

Session: Poster Session
Presenter: D.C. Meier, Texas A&M University
Authors: D.C. Meier, Texas A&M University
V. Bukhtiyarov, Texas A&M University
D.W. Goodman, Texas A&M University
Correspondent: Click to Email
A great deal of interest has been generated by the catalytic properties of gold nanoclusters on metal oxide supports. These complex systems will be better understood if they are first dissected into their simplest components and studied separately. After comparing and contrasting the behavior of the components to the behavior of the system of interest, conclusions can be drawn as to the function of the catalytic system. With this information, steps can be taken to optimize those properties with the most desirable catalytic effects. IRAS studies of the dynamics of CO adsorption on the Au{110}(1x2) and Au{110} unreconstructed surface were performed as a function of CO pressure and sample temperature. The CO IRAS absorption shifted from 2118 cm@super -1@ to 2108 cm@super -1@ with increasing coverage on the reconstructed surface while the unreconstructed sample exhibited no shift, remaining at 2108 cm@super -1@. Clausius-Clapeyron data analysis yielded a E@sub a@ for CO adsorption of 12 kcal/mole at low coverages and 9 kcal/mole at elevated coverages, where the phase change appears at approximately 0.17 monolayers. These results are compared and contrasted to CO adsorption on Au/TiO@sub 2@ systems, which exhibit similar wavenumber shifts, but at higher adsorption energies.