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Selectivities for ethene and ethane formation during oxidative dimerization of methane over cerium mixed oxide catalysts Ce1 –x Ybx02 – 0.5x and SrCe1 –x YbxO3 – 0.5 x appear to be related to the nature of their ionic conduction, decreasing with oxygen ion mobility while increasing with proton mobility.
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Machida et al. (1987) studied this question.
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