Dynamics of Catalytic Methane Coupling

Transient experiments at 750 °C and 1 atm with methane and O2 over Li2O/MgO and CeO/Li2O/MgO catalysts demonstrate that coupling can occur in the absence of gas-phase oxygen. Cerium oxides increase the amount of oxygen available for the reaction. CO2 also forms from oxygen associated with the cataly...

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Veröffentlicht in:	Industrial & engineering chemistry research 1997-08, Vol.36 (8), p.2970-2975
Hauptverfasser:	Mortazavi, Y, Hudgins, R. R, Silveston, P. L
Format:	Artikel
Sprache:	eng
Schlagworte:	03 NATURAL GAS 10 SYNTHETIC FUELS Catalysis CATALYTIC EFFECTS Catalytic reactions CERIUM OXIDES CHEMICAL REACTION KINETICS Chemistry ETHYLENE Exact sciences and technology General and physical chemistry LITHIUM OXIDES MAGNESIUM OXIDES METHANE OXIDATION SYNTHESIS Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Beschreibung
Zusammenfassung:	Transient experiments at 750 °C and 1 atm with methane and O2 over Li2O/MgO and CeO/Li2O/MgO catalysts demonstrate that coupling can occur in the absence of gas-phase oxygen. Cerium oxides increase the amount of oxygen available for the reaction. CO2 also forms from oxygen associated with the catalyst and appears to react on the surface to produce a carbonate. Oxygen in the gas phase is needed to decompose this carbonate at 750 °C. Adsorbed oxygen leads mainly to methane combustion, while most of the oxygen from the catalyst structure results in C2 products.
ISSN:	0888-5885 1520-5045
DOI:	10.1021/ie9606045