Abstract
Auger electron spectroscopy (AES) and high-resolution electron energy loss spectroscopy (HREELS) showed that hydrogen reduction at 700 °K of a 120-Å nickel film deposited on TiO 2 results in the segregation of TiO x ( x close to 1) onto the nickel surface. Titanium oxide appears to diffuse rapidly through nickel. Room-temperature CO uptake was found to decrease with increasing surface titanium oxide concentration. HREELS showed that the concentration of bridge-bonded CO relative to on-top CO after room-temperature CO exposure decreases with increasing titanium oxide coverage on nickel. A site giving rise to a CO stretching frequency of 1850 cm −1 was found to survive after extended reduction. This was attributed to a site near the surface titanium oxide on nickel. The present study suggests that both physical coverage of the nickel surface by TiO x and the chemical interaction between nickel and TiO x on the surface are involved in SMSI.
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