Inhibiting effect of sulfur and oxygen compounds on carbazole hydrogenitrogenation on NiMo/Al sub 2 O sub 3 catalysts and relation to gas-phase acidity

Conference · Wed Apr 01 04:00:00 EST 1987 · American Chemical Society, Division of Petroleum Chemistry, Preprints; (USA)

OSTI ID:5139999

Nagai, M; Ogino, T ^[1]

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1. Tokyo Univ. of Agriculture and Technology (Japan)

The inhibiting effect of various sulfur and oxygen compounds on carbazole hydrodenitrogenation on NiMo/Al{sub 2}O{sub 3} catalysts has been studied. The reactions were carried out with a flow microreactor at 260-360{degree}C and 10.1 MPa total pressure. A major denitrogenated product was bicyclohexyl, and a hydrogenated compound was tetrahydrocarbazole, accompanied by small amounts of perhydrocarbazole and hexahydrocarbazole. Sulfidation of the reduced catalyst increased the activity of the catalyst at all temperatures. At 360{degree}C, the presence of the sulfur and oxygen compounds depressed the denitrogenation of perhydrocarbazole to bicyclohexyl on the reduced and sulfided catalyst which was a rate-determining step. At lower temperatures, all the additives affected the hydrogenation of carbazole to tetrahydrocarbazole which was not in equilibrium and resulted in a decrease of denitrogenation. The denitrogenation of perhydrocarbazole was assumed to follow the Langmuir-type equation, allowing for competitive adsorption of perhydrocarbazole and additives on the denitrogenated sites. The relationship between the inhibiting effect of the additives and their gas-phase acidity was also discussed.

• OSTI ID: 5139999
• Report Number(s): CONF-8704347--
• Conference Information: Journal Name: American Chemical Society, Division of Petroleum Chemistry, Preprints; (USA) Journal Volume: 32:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ADDITIVES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
AZAARENES
AZOLES
CARBAZOLES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL REACTORS
DATA
DEACTIVATION
DENITRIFICATION
ELEMENTS
EQUATIONS
EQUILIBRIUM
EXPERIMENTAL DATA
FLUIDS
GASES
HETEROCYCLIC COMPOUNDS
HIGH PRESSURE
HIGH TEMPERATURE
HYDROGENATION
INFORMATION
MATHEMATICAL MODELS
METALS
MOLYBDENUM
NICKEL
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PREDICTION EQUATIONS
SULFUR COMPOUNDS
TRANSITION ELEMENTS