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The effect of CO2 addition on the ethane conversion reaction under the combined action of plasma and 10% CeO2/Y-Al2O3

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28 Jan,2022

The effect of CO2 addition on the ethane conversion reaction under the combined action of plasma and 10% CeO2/Y-Al2O3:
It can be seen that the conversion rate of CO2 decreases with the increase of CO2 addition, but it is higher than the conversion rate of pure CO2 under the same plasma conditions, which indicates that C2H6 contributes to the conversion of CO2. According to the reaction equations (3-40) and (3-41), the decomposition rate of CO2 is related to the concentrations of CO2, CO, O- and O in the plasma catalytic system. O and O- are consumed by the reaction with H, and H is determined by C2H6 decomposition reaction generated. Therefore, the conversion rate of CO2 increases with the increase of C2H6 concentration.
It can be seen that the selectivity of C2H4 and C2H2 decreases monotonically with the increase of CO2 and the addition amount, so although the conversion rate of ethane increases with the increase of CO2 addition, the total yield of C2H4 and C2H2 changes in a peak shape, and the addition amount of CO2 is The extreme value occurs at 50%. On the other hand, reactive oxygen species will further react with ethylene or acetylene, resulting in the cleavage of its C-H bond to form CO or carbon deposition. This phenomenon is especially obvious when the amount of CO2 added is large.
Therefore, when the amount of CO2 added is greater than 50%, the total yield of C2H4 and C2H2 decreases. The change in the amount of CO2 added leads to changes in the ratio of C2H4/C2H2 and H/CO in the gaseous products of the reaction. With the increase in the amount of CO2 added, the ratio of C2H4/C2H2 increases and the ratio of H2/CO decreases. This is due to the CO yield in the reaction system. due to rapid increase.