Promotion by tetrachloromethane of the oxidative coupling of methane on silica-supported alkaline earth oxides

Journal Article · Thu Feb 01 00:00:00 EST 1990 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(90)90249-J· OSTI ID:6217561

Ahmed, S; Moffat, J B ^[1]

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1. Univ. of Waterloo, Ontario (Canada)

The introduction of a small quantity of tetrachloromethane (TEM) into the feed stream has been shown to remarkably enhance the oxidative coupling of methane over alkaline earth oxides supported on silica. That this enhancement, in terms of both selectivity and yield to C{sub 2} hydrocarbons, occurs over a wide range of catalyst loading, feed composition, reaction temperature, and contact time has been illustrated using BaO/SiO{sub 2} as the catalyst. It has been demonstrated that over this catalyst, the coupling and nonselective oxidation processes occur predominantly independently of each other. The high ratio of C{sub 2}H{sub 4}/C{sub 2}H{sub 6} observed in the products is accounted for by the rapid homogeneous oxidative dehydrogenation of C{sub 2}H{sub 6}, a process which is evidently further enhanced by the presence of TCM. It is suggested that TCM promotes the coupling reaction by facilitating the hydrogen abstraction step from methane. Continuous cofeeding of the additive is required to maintain high selectivity and yield of C{sub 2} hydrocarbons in the products.

• OSTI ID: 6217561
• Journal Information: Journal of Catalysis; (USA), Vol. 121:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
CARBON TETRACHLORIDE
CATALYTIC EFFECTS
ETHANE
SYNTHESIS
ETHYLENE
METHANE
CATALYTIC REFORMING
OXIDATION
ADDITIVES
BARIUM OXIDES
CATALYST SUPPORTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
DEHYDROGENATION
PERFORMANCE TESTING
PROMOTERS
QUANTITY RATIO
SILICON OXIDES
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALKENES
BARIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
KINETICS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
REFORMER PROCESSES
SILICON COMPOUNDS
TESTING
YIELDS
030300* - Natural Gas- Drilling
Production
& Processing