Structure of propene in heterogeneous catalysis. II. Isomerization of propene by atomic nickel and magnesium
Journal Article
·
· J. Catal.; (United States)
Unstable ..pi..-propane-metal complexes are formed when excess propene is co-condensed with atomic nickel or magnesium. During the formation and decomposition of these complexes, the ligand undergoes a double-bond isomerization by a 1,3-hydrogen shift. Infrared and mass spectroscopic data from CD/sub 3/CHVertical BarCH/sub 2//metal complexes show metal-induced, sequential, intramolecular, hydrogen exchange reactions: CD/sub 3/CHVertical BarCH/sub 2/ ..-->.. CH/sub 2/DCHVertical BarCD/sub 2/ ..-->.. cis-CHD/sub 2/CDVertical BarCHD ..-->.. trans-CHD/sub 2/CHVertical BarCHD. No ..pi..-allyl species is observed during these reactions. The low decomposition temperatures of ..pi..-propene-nickel and -magnesium complexes (both about -140/sup 0/C) and the low isomerization activation energies (less than approx.0.5 kcal/mol) suggest direct formation of isomerization products from the ..pi..-propene without the intervention of any allyl intermediates. The ..pi..-propene may also be the only surface species necessary to acccount for the products in isomerization, hydrogen exchange, and hydrogenation reactions of propene on zinc oxide catalyst.
- Research Organization:
- The Pennsylvania State Univ., Univ. Park
- OSTI ID:
- 6786205
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 74:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400303* -- Organic Chemistry-- Isotope Exchange & Isotope Separation-- (-1987)
ALKALINE EARTH METALS
ALKENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL SHIFT
DATA
DEUTERIUM
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGEN
HYDROGEN ISOTOPES
INFORMATION
INFRARED SPECTRA
ISOMERIZATION
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
LOW TEMPERATURE
MAGNESIUM
METALS
NICKEL
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROPYLENE
SPECTRA
STABLE ISOTOPES
TRANSITION ELEMENTS
ZINC COMPOUNDS
ZINC OXIDES
400303* -- Organic Chemistry-- Isotope Exchange & Isotope Separation-- (-1987)
ALKALINE EARTH METALS
ALKENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMICAL SHIFT
DATA
DEUTERIUM
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGEN
HYDROGEN ISOTOPES
INFORMATION
INFRARED SPECTRA
ISOMERIZATION
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
LOW TEMPERATURE
MAGNESIUM
METALS
NICKEL
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROPYLENE
SPECTRA
STABLE ISOTOPES
TRANSITION ELEMENTS
ZINC COMPOUNDS
ZINC OXIDES