Investigations of active sites for methane activation in the oxidative coupling reaction over pure and Li-promoted MgO catalysts
Journal Article
·
· Journal of Catalysis; (United States)
OSTI ID:6304874
- Texas A M Univ., College Station (United States)
The oxidative coupling of methane to ethane over model MgO catalysts prepared under well-controlled, ultrahigh vacuum (UHV) conditions has been studied using a combination of surface science techniques and elevated-pressure kinetic measurements. The utilization of electron energy loss spectroscopy has allowed the authors to characterize a variety of defects and to identify the active sites which are responsible for the methane coupling reaction. The results indicate that [Li[sup +]O[sup [minus]]] centers are not likely directly involved in the methane activation step, but rather promote the production of F-type centers in the near-surface region which are responsible for this key step in the methane coupling reaction. The origin of [Li[sup +]O[sup [minus]]] and F-type defects and their densities and stabilities are discussed. 32 refs., 6 figs.
- OSTI ID:
- 6304874
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 140:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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Wed Sep 09 00:00:00 EDT 1992
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OSTI ID:539444
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Thu Jul 01 00:00:00 EDT 1993
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Related Subjects
10 SYNTHETIC FUELS
100200 -- Synthetic Fuels-- Production-- (1990-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALKANES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ACTIVATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DEFECTS
DIMERIZATION
ELECTRON SPECTROSCOPY
ENERGY-LOSS SPECTROSCOPY
ETHANE
HETEROGENEOUS CATALYSIS
HYDROCARBONS
KINETICS
LITHIUM COMPOUNDS
LITHIUM OXIDES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
METHANE
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLYMERIZATION
REACTION KINETICS
SPECTROSCOPY
100200 -- Synthetic Fuels-- Production-- (1990-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALKANES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ACTIVATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DEFECTS
DIMERIZATION
ELECTRON SPECTROSCOPY
ENERGY-LOSS SPECTROSCOPY
ETHANE
HETEROGENEOUS CATALYSIS
HYDROCARBONS
KINETICS
LITHIUM COMPOUNDS
LITHIUM OXIDES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
METHANE
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLYMERIZATION
REACTION KINETICS
SPECTROSCOPY