Reaction kinetics of the hydrodenitrogenation of decahydroquinoline over NiMo(P)/Al{sub 2}O{sub 3} catalysts

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:467968

Jian, M; Prins, R ^[1]

---

1. Swiss Federal Institute of Technology (ETH), Zurich (Switzerland)

The reaction mechanism and the kinetics of hydrodenitrogenation. (HDN) of decahydroquinoline (DHQ) over NiMo(P)/Al{sub 2}O{sub 3} catalysts were studied in the presence and absence of H{sub 2}S. Cis- and trans-propylcyclohexylamine were identified as the most important reaction intermediates; their reactivity was found to vary under different reaction conditions. The kinetic constants in the HDN network of DHQ were calculated assuming a Langmuir-Hinshelwood mechanism. It was found that, in the phosphorus-containing catalysts, the adsorption of DHQ was enhanced and the rate constant of the first C-N bond cleavage decreased. As a consequence, the overall HDN reaction rate of DHQ decreased when phosphorus was added to a NiMo/Al{sub 2}O{sub 3} catalyst. The effect of H{sub 2}S was the opposite of that of phosphorus: it increased the rate constants and decreased the adsorption constants. The inhibiting effect of DHQ on its own conversion was different from that on the hydrogenation of cyclohexene, proving that different catalytic sites are involved in these reactions.

• OSTI ID: 467968
• Report Number(s): CONF-960652--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
ALUMINIUM OXIDES
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
DENITRATION
HYDROGENATION
MOLYBDENUM
NICKEL
PETROLEUM
QUINOLINES
REACTION INTERMEDIATES
REFINING