The effects of rhenium and sulfur on the reactivity and selectivity of Pt single-crystal catalysts
- Lawrence Berkeley Lab., CA (United States) Univ. of California, Berkeley (United States)
Platinum-rhenium bimetallic surfaces have been prepared by condensing Re on Pt(111) crystal surfaces in ultrahigh vacuum (UHV) using a pulsed metal vapor vacuum arc plasma gun. Conversion reactions of n-hexane and cyclohexane have been studied. The same reactions were also performed over sulfided surfaces made by depositing atomic sulfur on the metal in UHV. The presence of Re on Pt(111) greatly increases the hydrogenolysis of n-hexane toward methylcyclopentane. The maximum reactivity for cyclization to form five-membered rings over the sulfided Pr-Re surfaces is obtained when the Pt surface is covered by 1 monolayer (ML) of Re. When the Pt(111) surface is covered by 1 ML of Re, the sulfided catalyst is twice as active as the unsulfided catalyst for cyclization of n-hexane. Presulfiding also enhances the dehydrogenation activity of cyclohexane over the Pt-Re bimetallic surfaces. In that case, maximum reactivity of sulfided catalysts is observed when the Pt surface is covered by 0.5 ML of Re. The authors conclude that the Pt-Re bimetallic catalyst shows its unique properties when it is combined with sulfur.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6984548
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 134:1; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ALKANES
ALLOYS
BIMETALS
CATALYSTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CYCLOALKANES
CYCLOHEXANE
DEHYDROGENATION
HEXANE
HYDROCARBONS
KINETICS
ORGANIC COMPOUNDS
PLATINUM ALLOYS
PLATINUM COMPOUNDS
PLATINUM METAL ALLOYS
PLATINUM SULFIDES
QUANTITY RATIO
REACTION KINETICS
REFORMER PROCESSES
REFRACTORY METAL COMPOUNDS
RHENIUM ALLOYS
RHENIUM COMPOUNDS
RHENIUM SULFIDES
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS