Adsorption and hydrogenation of ethylene, 1-hexene, and benzene and CO adsorption on Pt/Al/sub 2/O/sub 3/ and Pt-Sn/Al/sub 2/O/sub 3/ catalysts
Adsorption and hydrogenation of ethylene, 1-hexene, and benzene, and carbon monoxide adsorption on alumina-supported Pt and Pt-Sn catalysts were studied. Gravimetric experiments and infrared (IR) absorption spectroscopy combined with chemisorption measurements were used for this purpose. Additionally fresh and coked catalysts were characterized by the IR spectra of CO and chemisorption data. Added tin causes a slight increase in benzene adsorption and a distinct decrease in ethylene and 1-hexene uptakes, whereas the hydrogenation activity is inhibited. Adsorption and catalytic data with benzene can be explained by a model of flat adsorption on Pt/Al/sub 2/O/sub 3/ and tilted adsorption on Pt-Sn/Al/sub 2/O/sub 3/ and are consistent with electronic modification of platinum by tin. Electronic interaction between platinum and tin is also indicated by the IR data. The most active sites for hydrocarbon decomposition on the platinum surface are the same as those on which carbon monoxide is multiply bonded. Deposited coke and tin block the same active sites on the platinum surface.
- Research Organization:
- Institute of Kinetics and Catalysis, Sofia, Bulgaria
- OSTI ID:
- 5536454
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 103:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ABSORPTION SPECTROSCOPY
ADSORPTION
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BENZENE
BIMETALS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
COKE
DEPOSITION
ELECTRONIC STRUCTURE
ELEMENTS
ETHYLENE
HEXENES
HYDROCARBONS
HYDROGENATION
INFRARED SPECTRA
KINETICS
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
SPECTRA
SPECTROSCOPY
TIN
TRANSITION ELEMENTS