Mechanism of hydrodenitrogenation

Technical Report · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5532649

Miranda, R

Activity and selectivity for hydrodenitrogenation (HDN) of a series of acidic molybdena catalysts have been determined using the pyridine HDN reaction. Measurements of total activity, selectivity for HDN, selectivity towards saturated versus unsaturated hydrocarbons, and selectivity for cracking, as a function of support composition and molybdena loading, provide clear evidence of two predominant types of sites: highly reduced Mo sites and highly acidic Bronsted sites. Both sites chemisorb strongly the heterocyclic aromatics and hydrogenated amines. Highly reduced Mo sites are highly active for denitrogenation, as seen clearly for silica-supported catalysts. The acidic sites also contribute to denitrogenation, probably by Hofmann elimination, and are active in cracking and cyclization. The optimum combination of these two types of sites for maximum HDN selectivity occurs at 4 wt% molybdena loaded on silica-aluminas containing >50 wt% silica. 8 refs., 7 figs., 4 tabs.

• Research Organization: Louisville Univ., KY (United States). Dept. of Chemical Engineering
• Sponsoring Organization: DOE; NSF; USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: FG22-89PC89771
• OSTI ID: 5532649
• Report Number(s): DOE/PC/89771-6; ON: DE91016595; CNN: R11-8610671
• Country of Publication: United States
• Language: English

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ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AZINES
BROENSTED ACIDS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
DENITRATION
FUELS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGENATION
INORGANIC ACIDS
LEWIS ACIDS
LIQUID FUELS
MINERALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PROCESSING
PYRIDINE
PYRIDINES
REFINING
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SPECIFICITY
TRANSITION ELEMENT COMPOUNDS