Reactions of alkanes with deuterium on lanthana in the temperature range 570 to 720 K
Journal Article
·
· J. Catal.; (United States)
Reactions of methane, propane, n-butane, 2-methylpropane, and 2,2-dimethylpropane with deuterium have been studied on lanthana catalysts at 625 K and other high temperatures. The major products in all cases were the D/sub 1/-alkanes and other lightly exchanged molecules formed by a stepwise exchange process. Two further reactions occurred with alkanes which could undergo direct dehydrogenation; these were the formation of small quantities of highly exchanged alkenes and the formation of highly exchanged alkanes. Deuterium NMR spectroscopy was used to analyze the products from some of the reactions; this technique confirmed the presence of alkenes and gave quantitative information on the amounts of deuterium in various positions and groupings in the hydrocarbons. Primary C-H exchanged more rapidly than secondary or tertiary bonds but the rates of reaction at 625 K did not vary substantially with the nature of the hydrocarbon. The results provided mechanistic information about the probable nature and relative reactivity of various adsorbed intermediates. Some self-poisoning was observed in all cases.
- Research Organization:
- Univ. of Edinburgh (Scotland)
- OSTI ID:
- 5181925
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 107:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202* -- Isotope Effects
Isotope Exchange
& Isotope Separation
ALKANES
ALKENES
BUTANE
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DEHYDROGENATION
DEUTERIUM
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN ISOTOPES
HYDROGENATION
ISOTOPES
ISOTOPIC EXCHANGE
KINETICS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LIGHT NUCLEI
MAGNETIC RESONANCE
METHANE
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POISONING
PROPANE
RARE EARTH COMPOUNDS
REACTION KINETICS
RESONANCE
SPECTRA
STABLE ISOTOPES
400202* -- Isotope Effects
Isotope Exchange
& Isotope Separation
ALKANES
ALKENES
BUTANE
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DEHYDROGENATION
DEUTERIUM
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN ISOTOPES
HYDROGENATION
ISOTOPES
ISOTOPIC EXCHANGE
KINETICS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LIGHT NUCLEI
MAGNETIC RESONANCE
METHANE
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POISONING
PROPANE
RARE EARTH COMPOUNDS
REACTION KINETICS
RESONANCE
SPECTRA
STABLE ISOTOPES