Under the action of plasma plasma, the supported lanthanide oxide catalyst CO2 oxidizes CH4 to C2

• Categories:Company Dynamics
• Author:Plasma cleaning machine-CRF plasma plasma equipment-plasma surface treatment machine manufacturer-chengfeng intelligent manufacturing
• Origin:
• Time of issue:2022-03-03
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(Summary description)Under the action of plasma plasma, the supported lanthanide oxide catalyst CO2 oxidizes CH4 to C2: The supported lanthanide oxide catalysts have good OCM reactivity. In the catalytically activated CO2 oxidation of CH4 to C2 hydrocarbons, La2O3/ZnO gave a C2 hydrocarbon selectivity of up to 97% (the methane conversion rate was 2.1% at 850 °C). The study by Maraffee et al. , the La2O3-based catalyst gave higher CH4 conversion (27.4%) and C2 hydrocarbon yield (10%). Therefore, this study focused on the catalytic effect of five supported lanthanide oxide catalysts, La, Ce, Pr, Sm, and Nd, on the reaction of CO2 oxidation of CH4 to C2 hydrocarbons under the action of plasma. Under a certain plasma effect, the supported lanthanide oxide catalysts all showed a certain ability to activate CH4 and CO2. As a result of the combined action of lanthanide catalyst and plasma, the conversion rate of CH4 is 24%~36%; the conversion rate of carbon dioxide is 18%~22%. The experimental results show that under the action of plasma, different lanthanide catalysts have great differences in the activation ability of CH4, while the ability to activate carbon dioxide is similar (the CO2 conversion rate under the action of pure plasma is similar to 20%). According to the experimental fact that lanthanide catalysts have certain catalytic activity under pure catalytic conditions. It can be speculated that under the action of plasma, the catalyst can participate in the C-H bond cleavage process of methane through surface reaction. For CH4 activation: There are differences in the ability of lanthanide catalysts and plasma to activate CH through the joint action. The order of their joint action ability is as follows: Nd203/Y-Al203 > CeO2/Y-Al203 > Sm203/Y-Al203 > Pr2O11/Y -Al203 > La2O3/Y-Al2O3. According to the C2 hydrocarbon selectivity, the order of catalyst activity is: La2O3/Y-Al2O3>CeO2/Y-Al203≈Pr2O11/Y-Al203>Sm203/Y-Al2O3>Nd203/Y-Al2O3. Comparing the results of C2 hydrocarbon selectivity with the effect of lanthanide catalysts on C2 hydrocarbon yield, the order of the two is basically the same. The performance is higher than 70%, so the C2 hydrocarbon yield is higher than other rare earth catalysts. This is consistent with the high C2 hydrocarbon selectivity of La2O3 catalyst under pure catalytic conditions. However, lanthanide catalysts have little effect on the distribution of C2 hydrocarbon products, and C2H2 is the main C2 hydrocarbon product.