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Changes in selectivity in methane conversion over a magnesium oxide catalyst as a function of flow rate and oxygen conversion. χ, ethane; □, ethene; ○, carbon monoxide; ◆, carbon dioxide; ●, hydrogen; Δ, formaldehyde. Values are accurate to ±1% at oxygen conversions >60%, but only to ±5% at conversions <10%. Solid lines are guides to the eye. Reproduced with permission from ref (135). Copyright 1990 Springer Nature.
