Influence of the catalyst chloriding on isomerization and hydrogenolysis of n-pentane on Pt/Al/sub 2/O/sub 3/ catalysts
The influence of the catalysts chloriding on isomerization and hydrogenolysis of n-pentane on Pt/Al/sub 2/O/sub 3/ catalysts was studied at 300/sup 0/-436/sup 0/C in a pulse microreactor and a continuous-flow, bench-scale tubular reactor with 0.75 and 0.59Vertical Bar3< by wt Pt/Al/sub 2/O/sub 3/ commercial reforming catalysts that contained 0.03, 0.066, or 0.087Vertical Bar3< sulfur. Fully sulfided catalysts (Vertical Bar3: 0.072Vertical Bar3< sulfur) showed high and stable isomerization activity but low-sulfur samples were more active in hydrogenolysis. Chlorination of the catalysts with CCl/sub 4/ in hydrogen flow at 400/sup 0/C decreased n-pentane conversion, effectively suppressed hydrogenolysis, and increased isomerization selectivity to 100Vertical Bar3<. By contrast, catalyst treatment with gaseous hydrogen chloride to the same chlorine content (5-7Vertical Bar3< by wt), had only a minor effect on the catalyst activity and selectivity. Apparently, the deactivation of the Pt sites specifically responsible for hydrogenolysis is mainly due to sulfiding or the deposition of coke formed from CCl/sub 4/ and to a much lesser extent to their chlorination. CCl/sub 4/ treatment also enhances the acidity of the alumina support and thus accelerates olefin isomerization. Hydrogen chemisorption and desorption data were used to characterize the Pt surface of the catalysts and their selectivities.
- Research Organization:
- Rijksuniv. Gent
- OSTI ID:
- 6916442
- Journal Information:
- Ind. Eng. Chem., Prod. Res. Dev.; (United States), Journal Name: Ind. Eng. Chem., Prod. Res. Dev.; (United States) Vol. 18:2; ISSN IEPRA
- 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
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
CHLORINATION
DATA
DESORPTION
ELEMENTS
EXPERIMENTAL DATA
HALOGENATION
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
INFORMATION
ISOMERIZATION
METALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PENTANE
PLATINUM
PLATINUM METALS
SEPARATION PROCESSES
SORPTION
SPECIFICITY
SULFIDATION
SURFACE PROPERTIES
TRANSITION ELEMENTS