The rhodium-molybdenum interaction in Rh/Mo/Alumina

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1156· OSTI ID:5990185

Storm, D A; Cataldo, M C; DeCanio, E C ^[1]; Mertens, F P

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1. 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), Vol. 141:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
STRUCTURAL CHEMICAL ANALYSIS
MOLYBDENUM
RHODIUM
ABSORPTION SPECTROSCOPY
CARBON MONOXIDE
CATALYST SUPPORTS
CHEMISORPTION
HYDROGEN
ION MICROPROBE ANALYSIS
MASS SPECTROSCOPY
OXIDATION
PARTICLES
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
ELEMENTS
METALS
MICROANALYSIS
NONDESTRUCTIVE ANALYSIS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties