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Pyridine hydrodenitrogenation: An equilibrium limitation on the formation of piperidine intermediate
Author(s) -
Satterfield Charles N.,
Cocchetto Joseph F.
Publication year - 1975
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690210609
Subject(s) - piperidine , hydrodenitrogenation , hydrogenolysis , pyridine , chemistry , dehydrogenation , catalysis , limiting , medicinal chemistry , organic chemistry , hydrodesulfurization , mechanical engineering , engineering
Equilibration between pyridine and piperidine, the first product formed in the overall series of hydrodenitrogenation (HDN) reactions of pyridine, can be a rate‐limiting factor under some conditions. Thus, on a commercial NiMo/Al 2 O 3 catalyst at 11 bars pressure, a maximum in the pyridine HDN rate occurs at about 400°C, caused by a thermodynamic limitation on the allowable concentration of piperidine. From studies with pyridine and with piperidine, NiMo/Al 2 O 3 appears to have greater hydrogenation‐dehydrogenation activity than CoMo/Al 2 O 3 but CoMo/Al 2 O 3 appears to have greater hydrogenolysis activity than NiMo/Al 2 O 3 , at least at about 300°C and below.