Transfer of hydrogen by hydroaromatics. 1. Mechanism of dehydrogenation/hydrogenation in tetralin/iron catalyst systems
At 400/sup 0/C, the gas-phase dehydrogenation of tetralin over iron catalysts is found to result in formation of naphthalene via the reaction of intermediate 1,2-dihydronaphthalene. The kinetic data for these systems were found to follow heterogeneous, first-order rate laws. A mechanism is presented which quantitatively describes the measured tetralin and naphthalene kinetic behavior and successfully predicts the kinetic data observed for the 1,2-dihydronaphthalene intermediate. The rate-limiting reactions in these systems are proposed as involving dehydrogenation/hydrogenation reactions on the surfaces of the catalysts. Based on the data analysis, the rate constants for the surface reactions have values in the 10/sup -4/ to 10/sup -5/-s/sup -1/ range. The catalytic surface site populations were found to be in the range 10/sup 13/ to 10/sup 14/ molecules cm/sup -2/. 2 figures, 4 tables.
- Research Organization:
- Brookhaven National Lab., Upton, NY
- OSTI ID:
- 6776212
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 84:19; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
AROMATICS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CONDENSED AROMATICS
DATA
DEHYDROGENATION
ELEMENTS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
IRON
KINETICS
METALS
NAPHTHALENE
NUMERICAL DATA
ORGANIC COMPOUNDS
REACTION INTERMEDIATES
REACTION KINETICS
TEMPERATURE DEPENDENCE
TETRALIN
TRANSITION ELEMENTS
YIELDS