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Surface layering within grains of alumina support effects on hydrotreating catalysts

Journal Article · · Ind. Eng. Chem., Prod. Res. Dev.; (United States)
DOI:https://doi.org/10.1021/i360066a005· OSTI ID:5273193
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Previous studies which found that the activities of catalysts containing 1.1% by wt cobaltous oxide (CoO) and 2.2% by wt molybdenum trioxide (MoO/sub 3/) approached those of commercially available catalysts (3% by wt CoO, 12% by wt MoO/sub 3/), alluded to a surface layering effect of catalytic material within the particles or grains of the alumina support. Experiments at 380/sup 0/-420/sup 0/C on the hydrotreating of a heavy gas oil (derived from hydrocracking of Athabasca bitumen) in a 155 cc bench-scale fixed-bed reactor showed that surface layering during the preparation of hydrotreating catalysts does increase the activity. The surface layering effect was enhanced when the cobalt and molybdenum salts were impregnated into large alumina monohydrate particles, but the presence of an excessive amount of nitric acid during impregnation promoted gelling of the alumina and tended to eliminate surface layering. Surface layering had very little effect on sulfur and nitrogen conversion. However, the time-temperature history (spray drying vs. kiln drying) of the alumina monohydrate did alter the density and porosity of the catalyst pellets. This in turn was reflected in the reaction rate per unit weight of catalyst.
Research Organization:
Can. Dep. Energy, Mines and Resources, Ontario
OSTI ID:
5273193
Journal Information:
Ind. Eng. Chem., Prod. Res. Dev.; (United States), Journal Name: Ind. Eng. Chem., Prod. Res. Dev.; (United States) Vol. 17:2; ISSN IEPRA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
COBALT OXIDES
COMPARATIVE EVALUATIONS
CRACKING
DECOMPOSITION
DEPOSITION
DRYING
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GAS OILS
HIGH TEMPERATURE
HYDROCRACKING
HYDROGENATION
KINETICS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PACKED BED
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM PRODUCTS
POROSITY
PYROLYSIS
REACTION KINETICS
SULFUR
SURFACE COATING
SURFACE TREATMENTS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS