Spectroscopy of Metal/Titania Systems.
Technical rept. 1 Jan-31 Dec 85,
TEXAS UNIV AT AUSTIN DEPT OF CHEMISTRY
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Thin film models of catalysts known to show strong metal support interactions were investigated. These consist of vapor-deposited Pt or Rh on Ti02 films prepared in ultrahigh vacuum by oxidation of Ti000 or -. TDS, AES and static SIMS were used to characterize the surfaces before and after thermal treatment in vacuum and with or without chemisorbed C0. The results indicate that heating in vacuum to near 750K leads to migration of a reduced form of titania to the metal film surface, accompanied by suppression of C0 and hydrogen chemisorption. In 1 to 2 ML metal films with no surface titania species, no significant suppression of hydrogen chemisorption is seen, indicating that surface segregation alone is not responsible for the changes in hydrogen chemisorption extent and energetics.
- Atomic and Molecular Physics and Spectroscopy