Pyridine hydrodenitrogenation: an equilibrium limitation on the formation of piperidine intermediate. [Cobalt/molybdenum/alumina or nickel/molybdenum/alumina catalysts]
The hydrodenitrogenation (HDN) of pyridine and of piperidine was studied in a continuous flow, isothermal microreactor at 11 atm, 200/sup 0/ to 425/sup 0/C and over nickel/molybdenum/alumina (A) or cobalt /molybdenum/alumina (B) commercial catalysts. The results showed that equilibration between pyridine and piperidine, the first product formed in the over-all series of HDN reactions of pyridine, can be a rate-limiting factor under some conditions. Thus, on catalyst A at 11 atm, a maximum in the pyridine HDN rate occurs at about 400/sup 0/C, caused by a thermodynamic limitation on the allowable piperidine concentration. Catalyst A appears to have greater hydrogenation-dehydrogenation activity than catalyst B, but the latter appears to have greater hydrogenolysis activity that the former, at least at about 300/sup 0/C and below.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge
- OSTI ID:
- 7301894
- Journal Information:
- AIChE J.; (United States), Journal Name: AIChE J.; (United States) Vol. 21:6; ISSN AICEA
- Country of Publication:
- United States
- Language:
- English
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ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AZINES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT
CRACKING
DECOMPOSITION
DEHYDROGENATION
DENITRIFICATION
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDROCRACKING
HYDROGENATION
METALS
MOLYBDENUM
NICKEL
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PYRIDINE
PYRIDINES
PYROLYSIS
REFRACTORY METALS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS