Activation and oxidative dimerization of methane over lithium-promoted zinc oxide
- Texas A and M Univ., College Station (USA)
Lithium-doped ZnO has been found to be a relatively good catalyst for the oxidative dimerization of methane to ethane and ethylene. Maximum C{sub 2} yields of approximately 15% have been attained and are comparable with those previously observed over Li-doped MgO catalysts. Initial methane activation is believed to be via hydrogen atom abstraction by (Li{sup +}O{sup {minus}}) centers on the catalyst surface, and this results in the formation of surface-generated gas-phase methyl radicals. Gas-phase radical reactions provide the primary pathway for the formation of selective C{sub 2} products. Nonselective C{sub 1} product formation is most likely promoted on the pure ZnO surface. Zinc oxide is a nonbasic semiconductor, whereas MgO is a basic insulator. However, these differences in electronic and basic properties tend to disappear when the oxides are doped with lithium, and the similarities are reflected in the catalytic properties.
- OSTI ID:
- 6555167
- Journal Information:
- Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 112:2; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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ALCOHOLS
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALKENES
ALKYL RADICALS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ACTIVATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DIMERIZATION
DOPED MATERIALS
ELEMENTS
ETHANE
ETHYLENE
HYDROCARBONS
HYDROXY COMPOUNDS
KINETICS
LITHIUM
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
METALS
METHANE
METHANOL
METHYL RADICALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLYMERIZATION
PROMOTERS
RADICALS
REACTION KINETICS
SURFACE PROPERTIES
SYNTHESIS
YIELDS
ZINC COMPOUNDS
ZINC OXIDES