The effect of rhenium, sulfur and alumina on the conversion of hydrocarbons over platinum single crystals: Surface science and catalytic studies
- Univ. of California, Berkeley, CA (United States)
Conversion reactions of hydrocarbons over Pt-Re model catalyst surfaces modified by sulfur and alumina have been studied. A plasma deposition source has been developed to deposit Pt, Re, and Al on metal substrates variable coverage in ultrahigh vacuum without excessive heating. Conversion of n-hexane was performed over the Re-covered Pt and Pt-covered Re surfaces. The presence of the second metal increased hydrogenolysis activity of both Pt-Re surfaces. Addition of sulfur on the model Catalyst surfaces suppressed hydrogenolysis activity and increased the cyclization rate of n-hexane to methylcyclopentane over Pt-Re surfaces. Sulfiding also increased the dehydrogenation rate of cyclohexane to benzene Over Pt-Re surfaces. It has been proposed that the PtRe bimetallic catalysts show unique properties when combined with sulfur, and electronic interactions exist between platinum, rhenium and sulfur. Decomposition of hydrocarbons on the sulfur-covered Pt-Re surfaces supported that argument. For the conversion of 1-butene over the planar Pt/AlOx, the addition of Pt increased the selectivity of hydrogenation over isomerization.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 10102735
- Report Number(s):
- LBL-32853; ON: DE93002557
- Resource Relation:
- Other Information: TH: Thesis (Ph.D.); PBD: Apr 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
HEXANE
CONVERSION
CYCLOHEXANE
CYCLOALKANES
BUTENES
PLATINUM
CATALYTIC EFFECTS
RHENIUM
CYCLIZATION
DEHYDROGENATION
SULFIDATION
ALUMINIUM OXIDES
HETEROGENEOUS CATALYSIS
400201
360104
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
PHYSICAL PROPERTIES