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Alkali doped ZnO samples were examined as catalysts for the conversion of methane to ethylene and ethane. Among the catalysts tested, 12.5 mol% Li-promoted zinc oxide was the most active and selective for the formation of C2-hydrocarbons. The highest yield of C2-compounds was 24.8% and the fraction of ethylene in C2-compounds was over 80% .

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The lithium-added beryllium oxide was studied as a catalyst for the oxidative coupling of methane. For example, 3 mol% Li-added BeO catalyst gave 813 mmol h−1 g−1 of C2-STY and 63% of selectivity under the reaction conditions of 760 °C, P(CH4) = 76.0 kPa, P (CH4)/P(O2) = 3 and W/F = 0.0033 gh l−1. The compound oxide Li2Be2O3 was formed by Li2O mixed with BeO at 700 °C. This compound oxide might be an active catalyst for the oxidative coupling of methane.

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