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Microwave assisted heterogeneous catalysis: effects of varying oxygen concentrations on the oxidative coupling of methane

By B.H. Ni, C. Lee, R.C. Sun and X.L. Zhang


The oxidative coupling of methane was investigated over alumina supported La2O3/CeO2 catalysts under microwave dielectric heating conditions at different oxygen concentrations. It was observed that, at a given temperature using microwave heating, selectivities for both ethane and ethylene were notably higher when oxygen was absent than that in oxygen/methane mixtures. The differences were attributed to the localised heating of microwave radiation resulting in temperature inhomogeneity in the catalyst bed. A simplified model was used to estimate the temperature inhomogeneity; the temperature at the centre of the catalyst bed was 85 °C greater than that at the periphery when the catalyst was heated by microwaves in a gas mixture with an oxygen concentration of 12.5% (v/v), and the temperature difference was estimated to be 168 °C in the absence of oxygen

Topics: TP
Year: 2009
OAI identifier: oai:eprints.soton.ac.uk:69856
Provided by: e-Prints Soton

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