Infrared studies of CO adsorption on reduced and oxidized Pt/TiO/sub 2/
Carbon monoxide adsorption experiments were studied on reduced and oxidized Pt/TiO/sub 2/ with FT-IR. On reduced samples two kinds of linear CO species were observed and assigned as adsorption on Pt close-packed (terrace) sites (2094 cm/sup -1/) and on Pt open (step) sites (2077 cm/sup -1/). In addition a bridged CO species was found at 1854 cm/sup -1/. Both linear species show increasing frequencies with coverage. Saturation CO uptake decreases with increasing substrate reduction temperature and there is a preferential decrease of linear CO species on terrace sites and the concentration of bridged species lies below detection limits. On oxidized Pt/TiO/sub 2/ samples, some Pt atoms are covered with oxygen atoms and the density of step sites is enhanced. On these surfaces there are two kinds of linear CO species assigned to terraces (2130 cm/sup -1/) and steps (2101 cm/sup -1/) and a bridged CO species at 1880 cm/sup -1/. In addition, several CO species are found which are also detected on reduced samples. These species show intensity variations during lengthy exposures. Preadsorbed linear CO species (2130, 2094, and 2077 cm/sup -1/ bands) on oxidized samples are also sensitive to H/sub 2/ exposures.
- Research Organization:
- Univ. of Texas, Austin
- OSTI ID:
- 6264465
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 79:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ADDUCTS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON 16
CARBON 18
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMISORPTION
COMPARATIVE EVALUATIONS
ELEMENTS
EVEN-EVEN NUCLEI
INFRARED SPECTRA
ISOTOPE EFFECTS
ISOTOPES
ISOTOPIC EXCHANGE
KINETICS
LIGHT NUCLEI
METALS
MOLECULAR STRUCTURE
NUCLEI
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
RADIOISOTOPES
REACTION KINETICS
SECONDS LIVING RADIOISOTOPES
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VALENCE