Abstract
Oxidative coupling of methane to C 2-hydrocarbons over MgO, Li MgO, MnO x MgO, Li MnO x MgO, CdO MgO, Li CdO MgO, ZnO MgO and Li ZnO MgO catalysts at 823–1103 K in presence of free oxygen has been investigated. The C 2-selectivity of the catalysts and the ethylene-to-ethane ratio in the products were found to increase with the increase in the reaction temperature. The addition of lithium, zinc and cadmium promoters to MgO caused a very significant catalyst sintering resulting in a decrease in the catalyst surface area but an increase in the catalyst C 2-selectivity. The catalyst C 2-selectivity was found to be increased almost linearly with the decrease in the catalyst surface area. The lithium-promoted catalysts, however, showed a strong dependence of their methane conversion activity and C 2-selectivity on the time on-stream and are sintered extensively during the catalytic process. Among the catalysts, the Li ZnO MgO and Li CdO MgO showed superior performance in the methane conversion process.
Published Version
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