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Coal-derived liquids hydrotreatment. catalysts deactivation study

Thesis/Dissertation ·
OSTI ID:6329140
An automated Catalyst Life Test Unit was operated with three trickle bed reactors in parallel to assess the loss in activity of two cobalt-molybdenum-alumina catalysts and one nickel-molybdenum-alumina catalyst during hydrotreatment of FMC oil, Synthoil I liquid, Synthoil II liquid, and Rasyn liquid at 1500 psig and 371/sup 0/ to 454/sup 0/C. The nickel-molybdenum-alumina catalyst performed better than the cobalt-molybdenum-alumina catalyst for sulfur and nitrogen removal. Hydrotreatment with the cobalt-molybdenum-alumina catalyst resulted in reactor plugging within 200 to 372 hr for Rasyn liquid at 371/sup 0/C, whereas the nickel catalyst prevented plugging. The surface areas and pore volumes of spent catalysts were considerably less than that of the fresh catalysts. On regeneration, most of the surface area and pore volume was recovered. A semimechanistic model was developed to represent the data. Carbonaceous depositions seem to be the main cause for loss of catalyst activity, but inorganic depositions are also responsible, and inhibitive adsorption of nitrogen containing compounds may be involved as well.
OSTI ID:
6329140
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBONACEOUS MATERIALS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL REACTORS
COAL LIQUEFACTION
COAL LIQUIDS
COBALT
DEACTIVATION
DENITRIFICATION
DEPOSITION
DESULFURIZATION
ELEMENTS
FLUIDS
HIGH PRESSURE
HIGH TEMPERATURE
HYDROGENATION
INHIBITION
INORGANIC COMPOUNDS
LIQUEFACTION
LIQUIDS
MATERIALS
METALS
MOLYBDENUM
NICKEL
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PLUGGING
POROSITY
REGENERATION
SORPTION
SURFACE AREA
SURFACE PROPERTIES
SYNTHOIL PROCESS
TESTING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
VOLUME