Abstract
Abstract The oxidative coupling of methane over a lithium-promoted magnesium oxide catalyst was studied in a small fixed-bed reactor at 770°C. Methane conversion increased with oxygen level in the feed gas and gas contact time but at the expense of reduced selectivity to C2+ hydrocarbons. Nonetheless, with a feed gas containing 9.4 vol% oxygen, 11% methane conversion and 76% hydrocarbon selectivity were achieved. The high exothermicity of the oxidative coupling reactions would require a large-scale fixed-bed reactor to be operated as a multi-bed unit with staged oxygen addition. Alternatively, if the process is conducted in a single step some form of fluidised-bed reactor is necessary.
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