Ni, B.H., Lee, C., Sun, R.C. and Zhang, X.L.
Microwave assisted heterogeneous catalysis: effects of varying oxygen concentrations on the oxidative coupling of methane.
Reaction Kinetics and Catalysis Letters, 98, (2), . (doi:10.1007/s11144-009-0089-y).
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.
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