Deactivation kinetics and mechanism in heptane reforming over Pt/Al{sub 2}O{sub 3} and Pt-Re/Al{sub 2}O{sub 3} catalysts

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:215045

Liu, K; Rumschitzki, D S ^[1]; Ho, T C ^[2]

---

1. City College of New York, NY (United States)
2. Exxon Research and Engineering Co., Annandale, NJ (United States); and others

The kinetics of catalyst deactivation in n-heptane reforming over Pt/Al{sub 2}O{sub 3} and Pt-Re/Al{sub 2}O{sub 3} have been studied in a novel vibrational microbalance reactor. This microbalance reactor eliminates the problem of severe gas bypassing in conventional gravimetric microbalances. The coking rate decays exponentially with the amount of coke on the catalyst. Increasing the partial pressure of the hydrocarbon feed increases coking while hydrogen has the opposite effect. The relationship between the deactivation rate constants for toluene and for coke is determined. It provides insight into the deactivation mechanism. Coking experiments from the vibrational microbalance confirm that the bulk of the coke deposited comes from C{sub 5}-ring naphthenes. The extent of coke removal by hydrogen stripping is discussed.

• OSTI ID: 215045
• Report Number(s): CONF-950801--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
ALUMINIUM OXIDES
CATALYSTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
COKE
DEACTIVATION
HEPTANE
HYDROAROMATICS
MICROBALANCES
PLATINUM
RHENIUM