Abstract
We describe a three-step bromine-mediated process for oxidative coupling of methane using O 2 as oxidant. In the first step, a supported metal bromide solid is treated with O 2 to generate Br 2 and supported metal oxide. The Br 2 thus formed reacts with excess CH 4, giving a mixture of CH 4, bromomethanes, and HBr. This mixture is passed over a CaO/zeolite composite which condenses bromocarbons with 100% conversion to products, and neutralizes HBr to reform the metal bromide. The resulting product contains higher hydrocarbons, excess CH 4, and water. Once the HBr neutralizing capacity of the CaO is spent, the supported CaBr 2/ZSM-5 may also serve as catalyst for methyl bromide coupling. The effect of temperature, pressure, and reaction time on the intermediate methane bromination as well as on the overall partial oxidation product distribution is discussed. Incorporation of this scheme into a reactor into which only methane and O 2 are fed is described.
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