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- W4385999329 abstract "Abstract BACKGROUND The oxidative coupling of methane (OCM) is an interesting route for direct conversion of methane into ethylene and ethane. Nevertheless, CO x is a secondary product of this route, which decreases the selectivity of hydrocarbons. In this work it is proposed to overcome this drawback by using biogas as source of methane. In addition to being a renewable source of methane, the presence of CO 2 in biogas may shift the balance of the methane combustion. For this purpose, it was evaluated how process conditions such as O 2 and CO 2 flow rates and temperature affect biogas‐based OCM, in the temperature range of 650–800 °C, using lime as catalyst. RESULTS The increase in CO 2 flow from 0 to 15 mL.min −1 increased the ethylene selectivity from 25.9% to 44.5% at 800 °C. As consequence, CO 2 formation dropped from 53.9% to 18.3%. Methane conversion was not affected significantly by CO 2 flow rate, remaining in the range of 22–25%. O 2 flow was essential to activate the OCM reaction and the presence of higher concentrations of O 2 favored the selectivity of ethylene, but also increased the CO 2 produced through methane combustion. In the OCM experiments with variable flow of CO 2 , the highest C 2 yield of 18% was obtained for the highest flow of co‐fed CO 2 , whereas the experiments with biogas and variable O 2 flow showed the highest yield of ethylene for the highest flow of air co‐fed. CONCLUSION Thus, biogas‐based OCM was shown to be a promising route to improve C 2 selectivity, since the CO 2 present in the biogas minimizes the formation of CO 2 in the reaction. The use of lime as a low‐cost catalyst proved to be viable for the OCM reaction, presenting results compatible with those obtained for catalysts with more complex composition. © 2023 Society of Chemical Industry." @default.
- W4385999329 created "2023-08-20" @default.
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- W4385999329 date "2023-09-07" @default.
- W4385999329 modified "2023-10-07" @default.
- W4385999329 title "Ethylene production by partial oxidation of biogas using lime as catalyst" @default.
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- W4385999329 doi "https://doi.org/10.1002/jctb.7494" @default.
- W4385999329 hasPublicationYear "2023" @default.
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