Carbon-13 isotopic tracer study of 2-methylpentane isomerization on PtTe/Al sub 2 O sub 3 and PtSb/Al sub 2 O sub 3 catalysts
- Louisiana State Univ., Baton Rouge (USA)
The mechanism of the isomerization reaction of 2-methylpentane on highly dispersed Pt/Al{sub 2}O{sub 3} modified by the addition of Te or Sb has been investigated. The relative contributions of C{sub 5}-cyclic and bond shift mechanisms were determined by the use of 2-methylpentane (2-{sup 13}C) and 2-methylpentane (5-{sup 13}C) along with {sup 13}C NMR analysis. n-Hexane was formed primarily by a C{sub 5}-cyclic mechanism while 3-methylpentane was produced by both cyclic and bond shift mechanisms. Isomerization via bond shift increases when Te or Sb is added to Pt/Al{sub 2}O{sub 3}. The results can be best described if the Rooney-Samman isomerization mechanism, which includes a transient cyclopropyl species as an intermediate in the methyl shift process, is favored upon Pt modification by Te or Sb.
- OSTI ID:
- 7263240
- Journal Information:
- Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 118:2; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
Similar Records
The role of tellurium and antimony in PtTe/Al sub 2 O sub 3 and PtSb/Al sub 2 O sub 3 reforming catalysts
Isomerization and hydrogenolysis of hexanes on an alumina-supported Pt-Ru catalyst
Related Subjects
020400* -- Petroleum-- Processing
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ANTIMONY
CARBON 13
CARBON ISOTOPES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELEMENTS
EVEN-ODD NUCLEI
HEXANE
HYDROCARBONS
ISOMERIZATION
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LIGHT NUCLEI
MAGNETIC RESONANCE
METALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PENTANE
PLATINUM
PLATINUM METALS
PROMOTERS
REACTION KINETICS
RESONANCE
SEMIMETALS
STABLE ISOTOPES
SYNTHESIS
TELLURIUM
TRACER TECHNIQUES
TRANSITION ELEMENTS