Oxidative dimerization of methane over lanthanum oxide
Under oxygen-limiting conditions La/sub 2/O/sub 3/ is a reasonably selective catalysts for the conversion of methane to ethane and ethylene (C/sub 2/ compounds). At 725 /sup 0/C a selectivity to C/sub 2/ compounds of 47% was achieved at a CH/sub 4/ conversion of 9.4%. Although La/sub 2/O/sub 3/ is very effective in the generation of gas-phase CH/sub 3/ x radicals, which are believed to be intermediates in the oxidative dimerization, the catalyst also is active for the complete oxidation of C/sub 2/H/sub 6/ under the reaction conditions. Higher reaction temperatures favor C/sub 2/H/sub 4/ which may be formed from C/sub 2/H/sub 6/ via gas phase reactions. 25 references, 2 figures, 3 tables.
- Research Organization:
- Texas A and M Univ., College Station
- OSTI ID:
- 5896782
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:4; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
ALKENES
ALKYL RADICALS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DATA
DIMERIZATION
ETHANE
ETHYLENE
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
METHANE
METHYL RADICALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLYMERIZATION
RADICALS
RARE EARTH COMPOUNDS
REACTION INTERMEDIATES
YIELDS