Mechanism of the oxidative coupling of methane using CO sub 2 as an oxidant over PbO-MgO
- Tokyo Institute of Technology, Yokohama (Japan)
CO{sub 2} was suggested to be utilized as an oxidant for the oxidative coupling of methane over PbO-MgO and alkaline earth metal-doped CaO catalysts under P{sub CH{sub 4}} = 8.3 kPa, P{sub CO{sub 2}} = 8.3 kPa, and P{sub O{sub 2}} = 0.08 kPa, and at 1,073 K. The mechanism of this reaction (2CH{sub d4} + CO{sub 2} = C{sub 2}H{sub 6} + CO + H{sub 2}O and/or 2CH{sub 4} + 2CO{sub 2} = C{sub 2}H{sub 4} + 2CO + 2H{sub 2}O) was studied over a 15 mol% PbO-MgO catalyst by using isotope techniques and kinetics. {sup 13}CO{sub 2} and {sup 12}CD{sub 4} gave exclusively {sup 13}CO and {sup 12}c{sub 2} hydrocarbons, and no {sup 12}CO was produced under the low W/F conditions at 1,073 K. One of the oxygen atoms of CO{sub 2} was concluded to be used for the CH{sub 4} coupling reaction through the reverse shift reaction of CO{sub 2}. It was also found that C{sub 2} hydrocarbons reacted further with oxygen from CO{sub d2} under conditions of high conversion.
- OSTI ID:
- 6350842
- Journal Information:
- Journal of Catalysis; (USA), Vol. 122:2; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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METHANE
CATALYTIC REFORMING
OXIDATION
OXIDIZERS
PERFORMANCE TESTING
ALKALINE EARTH METALS
CALCIUM OXIDES
CARBON 12
CARBON 13
CARBON DIOXIDE
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
DEUTERIUM
DOPED MATERIALS
ETHANE
ETHYLENE
LEAD OXIDES
MAGNESIUM OXIDES
NATURAL GAS
PRESSURE DEPENDENCE
SYNTHESIS
TRACER TECHNIQUES
USES
VERY HIGH TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALKENES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
ENERGY SOURCES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HYDROCARBONS
HYDROGEN ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LEAD COMPOUNDS
LIGHT NUCLEI
MAGNESIUM COMPOUNDS
MATERIALS
METALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
REFORMER PROCESSES
STABLE ISOTOPES
TESTING
030300* - Natural Gas- Drilling
Production
& Processing