Spectroscopy of Metal/Titania Systems.

Abstract

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 Ti(000 + 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.

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Document Details

Document Type
Technical Report
Publication Date
Oct 15, 1985
Accession Number
ADA160698

Entities

People

  • D. N. Belton
  • J. Michael White
  • Y. M. Sun

Organizations

  • University of Texas at Austin

Tags

Communities of Interest

  • Air Platforms
  • Autonomy
  • C4I

DTIC Thesaurus Topics

  • Abstracts
  • Chemisorption
  • Chemistry
  • Classification
  • Elements
  • Films
  • Hydrogen
  • Kinetic Energy
  • Metal Films
  • Migration
  • Military Research
  • Oxidation
  • Plastic Explosives
  • Security
  • Ultrahigh Vacuum
  • United States Government
  • Vacuum

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Pulsed Power and Plasma Physics.