Kinetics of self-poisoning of Pd/Al/sub 2/O/sub 3/ catalysts in the hydrogenolysis of cyclopentane: influence of the dispersion of palladium and sulfate poisoning
The deactivation (i.e., coking) of well-dispersed palladium on alumina during the reaction of 100 mm Hg cyclopentane, with 660 mm Hg hydrogen at 290/sup 0/C to give n-pentane had a rate constant that was inversely proportional to the catalyst weight. The deactivation was second-order in cyclopentane, had an activation energy of 63 kcal/mole, and changed mechanism above 320/sup 0/C. These data were correctly represented by Levenspiel's model. For palladium crystallite sizes of 12-80A., both the hydrogenolysis and deactivation were insensitive to particle size. The addition of 0.1-0.4Vertical Bar3< sulfur as sulfate to catalysts containing 0.25-1.0Vertical Bar3< palladium poisoned both hydrogenolysis and deactivation reactions if the catalyst was reduced at 400/sup 0/C, but had little effect if the catalyst was reduced at 300/sup 0/C.
- Research Organization:
- Inst. Rech. Catal., Villeurbanne
- OSTI ID:
- 6922903
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 54:3; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
CATALYST SUPPORTS
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CYCLOALKANES
DEACTIVATION
ELEMENTS
HIGH TEMPERATURE
HYDROCARBONS
HYDROGENATION
KINETICS
LOW PRESSURE
METALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PALLADIUM
PARTICLE SIZE
PENTANE
PLATINUM METALS
POISONING
REACTION KINETICS
SIZE
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENTS
YIELDS