Activity enhancement of Li/MgO catalysts by lithium chloride as a lithium precursor for the oxidative coupling of methane
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A series of Li/MgO catalysts were prepared through the wet impregnation method for the oxidative coupling of methane with varying content of Li but with slight differences from others. The prepared catalysts were characterized by a variety of techniques, including X-ray diffraction, CO2-TPD, and BET methods. The catalytic performance and physical structure properties of the synthesized Li/MgO catalysts were compared with the available knowledge on Li/MgO. The reaction was carried out using a fixed bed reactor at 675–800 °C, while lithium loading and feed gas ratio were varied. The methane conversion was similar with only small fluctuation to the amount of lithium but selectivity toward C2 hydrocarbons increased with Li percentage. The methane conversion increased with the oxygen concentration, while ethane and ethylene selectivity decreased with increasing oxygen concentration.
KeywordsOCM Li/MgO Oxygen concentration Lithium loading Yield
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