Strong metal-support interaction in Ni/TiO/sub 2/: Auger and vibrational spectroscopy evidence for the segregation of TiO/sub x/ (x similarly ordered 1) on Ni and its effects on CO chemisorption

Journal Article · Thu Nov 01 00:00:00 EST 1984 · J. Catal.; (United States)

OSTI ID:6061562

Takatani, S; Chung, Y W

Auger electron spectroscopy (AES) and high-resolution electron energy loss spectroscopy (HREELS) showed that hydrogen reduction at 700/sup 0/K of a 120-A nickel film deposited on TiO/sub 2/ results in the segregation of TiO/sub 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/sup -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/sub x/ and the chemical interaction between nickel and TiO/sub x/ on the surface are involved in SMSI. 34 references, 8 figures.

• Research Organization: Northwestern Univ., Evanston, IL
• OSTI ID: 6061562
• Journal Information: J. Catal.; (United States), Vol. 90:1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON MONOXIDE
CHEMISORPTION
NICKEL
PERMEABILITY
REDUCTION
SURFACE PROPERTIES
TITANIUM OXIDES
DIFFUSION
AUGER ELECTRON SPECTROSCOPY
CATALYST SUPPORTS
CORRELATIONS
ENERGY-LOSS SPECTROSCOPY
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROGEN
MATHEMATICAL MODELS
NUMERICAL ANALYSIS
STRUCTURAL CHEMICAL ANALYSIS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
ELECTRON SPECTROSCOPY
ELEMENTS
INFORMATION
MATHEMATICS
METALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties