Effects of altervalent cation doping of TiO[sub 2] on H[sub 2] and CO adsorption on supported Rh
Journal Article
·
· Journal of Catalysis; (United States)
- Univ. of Patras (Greece)
The influence of W[sup 6+]-doping of TiO[sub 2] carriers on the mode of H[sub 2] and CO adsorption on Rh crystallites dispersed on their surfaces is investigated. It is shown that the electrical conductivity of W[sup 6+]-doped TiO[sub 2] is enhanced while the activation energy of electron conduction is reduced. The capacity of Rh to adsorb H[sub 2] at equilibrium is found to increase monotonically with increasing W[sup 6+]-dopant concentration in the carrier, while the strength of the adsorption bond is not significantly affected. The capacity of Rh to adsorb CO goes through a maximum at a W[sup 6+]-dopant concentration of 0.22 atom% in the TiO[sub 2] matrix. The strength of the CO adsorption bond is weakened when Rh is dispersed on doped TiO[sub 2]. These phenomena are attributed to long-range electronic interactions at the metal-support interface which alter the work function of surface metal atoms, as well as to short-range electronic interactions at the gas-metal-support interface. 54 refs., 9 figs., 5 tabs.
- OSTI ID:
- 7046021
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 145:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CHALCOGENIDES
CRYSTAL DOPING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY
HYDROGEN
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM METALS
RHODIUM
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CHALCOGENIDES
CRYSTAL DOPING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY
HYDROGEN
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM METALS
RHODIUM
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN