Co-activation of CH4 and CO2 to C2H4 by plasma plasma and Pd-La203/Y-Al203 catalyst

• Categories:Industry News
• Author:Plasma cleaning machine-CRF plasma plasma equipment-plasma surface treatment machine manufacturer-chengfeng intelligent manufacturing
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• Time of issue:2022-03-05
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(Summary description)Co-activation of CH4 and CO2 to C2H4 by plasma plasma and Pd-La203/Y-Al203 catalyst: The supported Pd catalyst is a catalyst for the hydrogenation of acetylene, and the micro-loaded Pd can reduce C2H2 to C2H4 or C2H6. When increased to 0.1%, the ethane mole fraction increased from 24.0% to 61.7%. The ethylene mole fraction decreased from 72.3% to 22.1%, while the C3 product mole fraction increased significantly. Therefore, in the reaction of plasma plasma and catalyst co-activated CO2 to oxidize CH4 to C2H4, as long as a trace amount of Pd is loaded on the catalyst, a C2H4 product with greater economic added value can be obtained. The research results of CO2 oxidation of CH to C2 hydrocarbons under the combined action of plasma plasma and catalyst show that La2O3/Y-Al203 can significantly improve the selectivity of C2 hydrocarbon products. Under the same plasma conditions, its C2 hydrocarbon product selectivity is higher than that of Y-Al203. It is higher than 40%, so the yield of C2 hydrocarbon products is high; although the supported metal catalyst Pd/Y-Al2O3 has little effect on the yield of C2 hydrocarbon products, it can obviously change the distribution of C2 hydrocarbon products, and the micro-loaded Pd can obviously Increase the mole fraction of C2H2 in the C2 hydrocarbon product. To this end, the co-activated CO2 oxidation of CH4 to C2H4 by plasma plasma and Pd-La2O3/Y-Al2O3 was studied, and the effects of parameters such as active component loading, feed gas composition, and energy density on the reaction were investigated. When the La2O3 loading was 2%, the C2 hydrocarbon selectivity increased from 30.6% to 72%. Although the methane conversion rate decreased from 43.4% to 24%, the C2 hydrocarbon yield still increased from 13.4% to 17.6%. La2O3 improves the CO2 conversion, but the CO yield decreases: when the La2O3 loading is changed in the range of 2% to 12%, the CH4 conversion and C2 hydrocarbon yield slightly change in peak shape, but the CO2 conversion and CO yield change slightly. The effect of Pd on the conversion rate of CH4 and CO2, and the yield of C2 hydrocarbons and CO basically has no effect when the loading of La2O3 reaches 12%. However, the Pd loading has a great influence on the distribution of C2 hydrocarbon products. When the Pd loading amount is 0.01%, the mole fraction of C2H4 in the C2 hydrocarbon products rises to 78%, that is, the C2 hydrocarbon products are mainly C2H4. C2H2 was detected but C3H8 was produced. When the Pd loading increased from 0.01% to 1%, the mole fraction of C2H4 in the C2 hydrocarbon product gradually decreased, while the mole fraction of C2H6 in the C2 hydrocarbon product gradually increased, indicating that the addition of Pd in ​​the La2O3/Y-Al2O3 catalyst was further increased. It can not increase the mole fraction of C2H4 in C2 hydrocarbon products, but promote the conversion of C2H4 to C2H6 and increase the mole fraction of C2H6 in C2 hydrocarbon products. The recommended loadings of active components Pd and La2O3 are 0.01% and 5%, respectively, that is, the catalyst is 0.01%Pd-5%La2O3/Y-Al2O3.