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Comparison of catalytic activity activation methods for plasma supported catalysts

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06 Mar,2022

Comparison of catalytic activity activation methods for plasma supported catalysts:
In the reaction of CO2 oxidation of CH4 to C2 hydrocarbons, the currently used methods for activating reactants methane and carbon dioxide include catalytic activation method and plasma plasma activation method, and the plasma catalytic activation method is introduced. For the convenience of comparison, the results of CO2 oxidation of CH4 to C2 hydrocarbons under three activation conditions are listed in Table 4-3. It can be seen from Table 4-3 that in the catalytic activation method, when the reaction temperature is as high as 1100K, methane can Converted to C2 hydrocarbons, although the selectivity of C2 hydrocarbons is high, the conversion rate of methane is very low, so the yield of C2 hydrocarbons is only 2%.
Plasma activation can significantly improve the methane conversion rate. When the plasma plasma injection power is 30W, the methane conversion rate reaches 26.5%, due to the lack of choice between the reactions between free radicals in the plasma plasma space and the decomposition effect of the plasma on the products. , resulting in a low C2 hydrocarbon selectivity (47.9%), and with the increase of plasma injection power, the C2 hydrocarbon selectivity decreases rapidly, so it is difficult to improve the C2 hydrocarbon yield under a certain plasma plasma injection power. In the reaction of plasma catalytic activation of CO2 oxidation of CH4 to C2 hydrocarbons, the activation of plasma can fully activate methane and improve the conversion rate of methane. The surface is selectively adsorbed and compounded to generate C2 hydrocarbon products, which improves the C2 hydrocarbon selectivity and C2 hydrocarbon yield.
Because it is still difficult to study the mechanism of the plasma-catalytic activation reaction using the existing detection instruments, the research on this reaction is still in the initial stage of speculation and exploration based on the experimental results. Comparing the three activation methods, plasma catalytic activation of CO2 oxidation of CH4 to C2 hydrocarbons should have application potential and is worthy of further study.
Table 4-3 Comparison of activation methods (unit: %)
Activation method Xcog XcH Sc Yc Yc, H Yco
Plasma 20.2 26.5 47.9 12.7 1.6 33.2
Catalysis 3.7 2.1 97.0 2.0 >2.0
Plasma-Catalysis 22.0 24.9 72.7 18.1 13.8 28.6