The rhodium-molybdenum interaction in Rh/Mo/Alumina
- Texaco R D, Beacon, NY (United States)
Rhodium and molybdenum form mixed metal particles when supported on alumina. Results of chemisorption, IR, and SIMS measurements indicate that the composition of the surface of these particles is sensitive to the environment in which the measurements are made. Molybdenum appears concentrated in the surface when the atmosphere is nonreducing, while rhodium appears concentrated in the surface when hydrogen is adsorbed. Chemisorption and infrared results indicate that molybdenum reduces the surface available for the chemisorption of carbon monoxide and hydrogen. The band for the linear carbonyl is shifted 8-11 cm[sup -1] higher when molybdenum is present, which may indicate oxidation of the rhodium by the molybdenum or increased dipolar present, which may indicate oxidation of the rhodium by the molybdenum or increased dipolar interactions between carbon monoxide molecules adsorbed on the smaller surface. Chemisorption and infrared results also suggest that adsorbed hydrogen increases electronic density at the rhodium sites. Bands for both the gem dicarbonyl and the linear carbonyl are shifted 7-10 cm[sup -1] lower in either Rh/alumina or Rh/Mo/alumina when hydrogen is adsorbed. 13 refs., 3 figs., 1 tab.
- OSTI ID:
- 5990185
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 141:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMISORPTION
ELEMENTS
HYDROGEN
ION MICROPROBE ANALYSIS
MASS SPECTROSCOPY
METALS
MICROANALYSIS
MOLYBDENUM
NONDESTRUCTIVE ANALYSIS
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PLATINUM METALS
RHODIUM
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENTS