A steady-state tracing kinetic analysis of oxidative coupling of methane over Li[sup +]-doped TiO[sub 2]: Mechanistic aspects of the carbon and oxygen reaction pathways to form CO[sub 2]
Journal Article
·
· Journal of Catalysis; (United States)
- Univ. of Patras (Greece)
- Institut de Recherches sur la Catalyse, Villeurbanne (France)
A steady-state tracing kinetic study of the oxidative coupling of methane reaction at 800[degrees]C over Li[sup +]-doped TiO[sub 2] catalyst was performed. In particular, the carbon and oxygen reaction pathways which lead to the formation of CO[sub 2] have been probed using [sup 13]CH[sub 4] and [sup 18]O[sub 2] isotope gases under reaction conditions. The results obtained indicate that there is practically no reversibly adsorbed CH[sub 4] on the catalyst surface, while there is a very small reservoir of carbon-containing intermediate species which eventually lead to CO[sub 2](0.1 [mu]mol/g). A large reservoir of oxygen species, participating in the formation of CO[sub 2] (at least 12.0 [mu]mol/g), was detected, while subsurface lattice oxygen species also participate in the oxygen reaction pathway to form CO[sub 2]. In addition, large amounts of inactive carbonaceous species (17.0 [mu]mol/g) accumulate on the catalyst surface after 1 h on stream. These species do not participate in the reaction route to form CO[sub 2] (spectator species). 23 refs., 7 figs.
- OSTI ID:
- 6658692
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 148:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:6154098
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· Journal of Catalysis
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Related Subjects
03 NATURAL GAS
033000 -- Natural Gas-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METALS
ALKANES
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYSIS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYSTAL DOPING
ELEMENTS
HETEROGENEOUS CATALYSIS
HYDROCARBONS
KINETICS
LITHIUM
METALS
METHANE
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
REACTION KINETICS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
033000 -- Natural Gas-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METALS
ALKANES
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYSIS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYSTAL DOPING
ELEMENTS
HETEROGENEOUS CATALYSIS
HYDROCARBONS
KINETICS
LITHIUM
METALS
METHANE
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
REACTION KINETICS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS