Abstract
Oxidative coupling of methane over sodium-promoted manganese-silica and manganese-magnesia was carried out catalytically with a methane-air cofeed. A catalyst of 12.5% sodium permanganate on magnesia gave a 15.7% yield of ethane, ethylene and higher hydrocarbons at 925°C, 9600 GHSV and 50% air in methane. Methane conversion and selectivity to C 2 + hydrocarbons was 22–25% and 65–70%, respectively. A Mars-van Krevelen type mechanism is proposed in which methyl radicals are formed at surface metal oxide sites. The methyl radicals subsequently dimerize or react with other hydrocarbons in the gas phase.
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