Influence of Co2 on the Catalytic Performance Of La2O3/CeO2 and CaO/CeO2 Catalysts in the Oxidative Coupling of Methane

Litawa, Barbara; Michorczyk, Piotr; Ogonowski, Jan

doi:10.2478/pjct-2013-0005

Abstract

In this work the La₂O₃/CeO₂ (33 mol % of La) and CaO/CeO₂ (33 mol % of Ca) catalysts were prepared by the impregnation method and characterized by XRD and CO₂-TPD. The catalytic properties of the catalysts were tested in the OCM process at 1073 K using the methane/oxygen mixture of the mole ratio 3.7 or 2.5 additionally containing CO₂ and helium balance. It was found that in the presence of both catalysts an addition of CO₂ enhances the selectivity to the ethylene and ethane and it does not have any negative influence on methane conversion. In the case of the CaO/CeO₂ catalyst the promoting effect of CO₂ was the highest. When the partial pressure of CO₂ equals to 39 kPa the increase in selectivity from 36 to 41% was noted while the conversion of methane equal to 19.4-19.7 %.

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Influence of Co2 on the Catalytic Performance Of La2O3/CeO2 and CaO/CeO2 Catalysts in the Oxidative Coupling of Methane

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