The effects of transition metal oxides on the methane oxidative coupling activity of doped MgO catalysts

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(91)90099-P· OSTI ID:5579853

Larkins, F P; Nordin, M R ^[1]

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1. Univ. of Tasmania, Hobart (Australia)

Magnesium oxide samples doped with different loadings of zinc and manganese oxides with and without lithium carbonate being present in the preparation were evaluated for their catalytic activity towards the oxidative coupling of methane to higher hydrocarbons. When Li{sub 2}CO{sub 3} is excluded, the exhaustive reactions of methane to form carbon oxides are favored. With a doped Li{sub 2}CO{sub 3} is excluded, the exhaustive reactions of methane to form carbon oxides are favored. With a doped Li{sub 2}CO{sub 3}/MgO catalyst, a methane conversion of > 25% and a selectivity to C{sub 2} hydrocarbons of near 60% was retained but not enhanced in the presence of different loadings of Zn oxide at 805 C. Low loading of Mn oxide on Li{sub 2}CO{sub 3}/MgO resulted in a methane conversion of > 35% and a selectivity to C{sub 2} hydrocarbons of near 50%. At high Mn oxide loadings the methane conversion decreases and the C{sub 2} selectivity is less than 30% due to more exhaustive oxidation. The activity of the doped catalyst is related to the physico-chemical properties, especially surface morphology, and metal oxide reducibility on the basis of SEM, XRD and electron microprobe analysis.

• OSTI ID: 5579853
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 130:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030300* -- Natural Gas-- Drilling
Production
& Processing
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALKENES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CARBONATES
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
CONTROL
DIFFRACTION
DOPED MATERIALS
ELECTRON MICROPROBE ANALYSIS
ELECTRON MICROSCOPY
ETHANE
ETHYLENE
HYDROCARBONS
LITHIUM CARBONATES
LITHIUM COMPOUNDS
LOADING RATE
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MANGANESE COMPOUNDS
MANGANESE OXIDES
MATERIALS
METHANE
MICROANALYSIS
MICROSCOPY
MORPHOLOGY
NONDESTRUCTIVE ANALYSIS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REDUCTION
REFORMER PROCESSES
SCANNING ELECTRON MICROSCOPY
SCATTERING
SURFACE PROPERTIES
SYNTHESIS
TEMPERATURE CONTROL
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
ZINC COMPOUNDS
ZINC OXIDES