Abstract
High-performance calcium oxide (CaO) catalysts were successfully synthesized from waste eggshell (ES) and waste cockle shell (CS), which consist mainly of calcium carbonate (CaCO3), and their catalytic behavior in the oxidative coupling of methane (OCM) was evaluated. Commercially available CaCO3 (CC) was also used as a starting material for comparison. The ES- and CS-derived CaO catalysts exhibited superior catalytic performance compared to the CC-derived catalyst due to presence of sodium (Na) and magnesium (Mg) elements in both ES and CS. Therefore, the concentration of Na and Mg in the waste-derived starting materials was further optimized, indicating that 5.0 wt.% of Na and 0.5 wt.% of Mg result in catalysts with high efficiency for OCM. Hence, this study clearly supports that waste materials can be converted into high-performance CaO catalysts for OCM by simply controlling their Na and Mg contents.
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