Oxidative coupling of methane. II. Formation of active sites by lead and tin oxides on MgO
- Univ. of Pittsburgh, PA (USA)
The oxidative coupling of methane has been studied over Sn-Mg-O catalysts with varying amounts of Sn. The addition of small amounts of tin oxide to MgO increased both the rate of methane conversion and the C{sub 2} selectivity. A maximum C{sub 2} selectivity of 40% was obtained over 0.4 at.% Sn-Mg-O at 780{degree} at a methane conversion of 20%. The maximum in C{sub 2} selectivity can be explained by considering an isolated site type mechanism in methane oxidation. According to this mechanism, an active and selective catalyst should have highly oxidizing sites isolated from each other by relatively inactive sites. Such an arrangement would allow a high methane conversion rate and the highest C{sub 2} selectivity by limiting the total oxidation of intermediates on the catalyst. A simple kinetic model based on the isolated site mechanism, which explains most of the catalytic features of the Sn-Mg-O catalytic system, has been developed. The model predicts an optimum selectivity for C{sub 2} hydrocarbons as a function of Sn content.
- OSTI ID:
- 6350802
- Journal Information:
- Journal of Catalysis; (USA), Vol. 123:1; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
Similar Records
Kinetics of a gas-phase chain reaction catalyzed by a solid: The oxidative coupling of methane over Li/MgO-based catalysts
Structure/function relationships in Nd{sub 2}O{sub 3}-doped MgO catalysts for methane coupling reaction
Related Subjects
LEAD OXIDES
CATALYTIC EFFECTS
MAGNESIUM OXIDES
METHANE
CATALYTIC REFORMING
OXIDATION
TIN OXIDES
CHEMICAL REACTION KINETICS
ETHANE
ETHYLENE
MATHEMATICAL MODELS
REACTION INTERMEDIATES
SURFACE PROPERTIES
SYNTHESIS
VERY HIGH TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALKENES
CHALCOGENIDES
CHEMICAL REACTIONS
HYDROCARBONS
KINETICS
LEAD COMPOUNDS
MAGNESIUM COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
REFORMER PROCESSES
TIN COMPOUNDS
030300* - Natural Gas- Drilling
Production
& Processing