Control of catalytic hydrotreating selectivity with ammonia

Technical Report · Mon Jan 01 04:00:00 EST 1990

DOI:https://doi.org/10.2172/6708242· OSTI ID:6708242

Satterfield, C N; Lee, Chung M

It was discovered that presence of low concentration of ammonia greatly reduces rate of hydrogenation of an aromatic compound (propylbenzene) on an industrial NiMo/Al[sub 2]O[sub 3] catalyst while it has only a mild inhibiting effect on hydrodenitrogenation (of quinoline). This suggests a way of industrial by reaction conditions of minimizing undesired aromatic hydrogenation during catalytic hydrodenitrogenation Coal liquids contain substantial amounts of a base fraction that consists of hydroxy pyridines, hydroxy indoles and/or hydroxy anilines. No information has been published on the HDN-HDO hydrotreating reactions of a compound in which a hydroxyl (phenolic) group is attached to a heterocyclic N compound. Thus the question has been raised of the extent to which quinoline HDN may or may not reflect the behaviour of such compounds. We have therefore performed a limited study with 8-hydroxy quinoline dissolved in tetralin utilizing a NiMo/Al[sub 2]O[sub 3] catalyst in a packed bed reactor operating at 360 and 385 and 6.9 MPa. We find that the N-heterocyclic ring is hydrogenated first to form an equilibrium mixture with a reaction intermediate identified as 8-OH-1,2,3,4 tetrahydroquinoline. Oxygen is then removed to form the same reaction intermediates we have observed from quinoline alone, but in somewhat different ratios. Therefore, with hydroxy-N-heterocyclic compounds, the OH group will likely be removed rapidly at the beginning.

• Research Organization: Massachusetts Inst. of Tech., Cambridge, MA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-89PC89775
• OSTI ID: 6708242
• Report Number(s): DOE/PC/89775-1; ON: DE93008384
• Country of Publication: United States
• Language: English

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ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
AZAARENES
AZINES
CATALYSIS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL LIQUIDS
DENITRIFICATION
DOCUMENT TYPES
ELEMENTS
FLUIDS
HETEROCYCLIC COMPOUNDS
HYDROGENATION
INHIBITION
LIQUIDS
METALS
MOLYBDENUM
NICKEL
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROGRESS REPORT
PYRIDINES
QUINOLINES
REACTION INTERMEDIATES
TRANSITION ELEMENTS