Surface spectroscopic characterization of cobalt-molybdenum-alumina catalysts

Journal Article · Thu Aug 05 04:00:00 EDT 1982 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100213a008· OSTI ID:6462600

Chin, R L; Hercules, D M

The structural characteristics of Co/Mo/Al/sub 2/O/sub 3/ hydrodesulfurization catalysts have been investigated with a variety of surface spectroscopic techniques: ESCA, ISS, and photoacoustic spectroscopy (PAS). All catalysts were prepared by sequential impregnation of Mo and Co into ..gamma..-Al/sub 2/O/sub 3/ with the Mo concentration held constant at 15% MoO/sub 3/ by weight as the cobalt concentration was varied from 1 to 9% CoO. In all catalysts interaction between Co and the support was observed which rendered a portion of the Co inert toward H/sub 2/ reduction and H/sub 2/S sulfidation. This interaction species (Co-t) is dominant for catalysts of low cobalt loading (i.e., 1% CoO). As the cobalt concentration is increased a new phase is formed characterized by interactions between Co and Mo. This species (Co-M) is produced up to a concentration of 7% CoO. Above this level, Co/sub 3/O/sub 4/ is formed. From ISS it was determined that the Co ions were situated beneath the Mo ions as Co-t and the Co-Mo interaction species. The presence of cobalt was found to have no effect on the reduction or sulfidation of Mo. 10 figures, 5 tables.

• Research Organization: Univ. of Pittsburgh, PA
• DOE Contract Number: AC02-79ER10485
• OSTI ID: 6462600
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:16; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BINDING ENERGY
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT
COBALT COMPOUNDS
COBALT OXIDES
DATA
DESULFURIZATION
DISPERSIONS
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
HYDROGENATION
INFORMATION
METALS
MIXTURES
MOLYBDENUM
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NONMETALS
NUMERICAL DATA
OPTIMIZATION
OXIDES
OXYGEN COMPOUNDS
PHOTOACOUSTIC SPECTROSCOPY
QUANTITY RATIO
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
SULFIDES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS