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Effects of gas added by plasma equipment manufacturers on methane conversion reaction in plasma

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25 Nov,2020

Effects of gas added by plasma equipment manufacturers on methane conversion reaction in plasma:

 

In order to reduce carbon deposition and further improve methane conversion rate and C2 hydrocarbon selectivity, the effects of various added gases on the reactions have been studied. Chen Dongliang et al. used microwave plasma technology to study N2 to promote methane coupling reaction, and the results showed that the production of C2H2 changed with the increase of N2, and the production of C2H6 and C2H4 decreased slightly, and HCN was detected in the reaction products.

 

Liu et al. used DC and AC corona discharge plasma technology to study the methane coupling reaction in the presence of oxidizing gas O2. When the frequency was 30 Hz, the voltage was 5 kV, and the gas flow rate was 100 mL /min, the methane conversion rate was 43.3%, the C2 hydrocarbon selectivity was 48.3%, and the C2 hydrocarbon yield was 21%. Studies of plasma equipment manufacturers show that CO and CO2 production are different in the products according to different ways of oxygen addition. The addition of other gases such as CO2 can inhibit the deep oxidation of methane, H2O can improve the conversion rate of methane, but the selectivity of C2 hydrocarbon decreases. The use of hydrogen plasma atmosphere in plasma equipment manufacturers is conducive to the activation and conversion of methane. With the increase of hydrogen mole fraction in raw gas, the conversion rate of methane and the yield of C2 hydrocarbon increase, and the carbon deposition decreases.

 

It can be seen from the experiments of plasma equipment manufacturers that the properties of added gases have a great influence on the product distribution. Reducing gases such as hydrogen can promote the formation of C2 hydrocarbon products; oxidizing gases such as oxygen are conducive to the formation of oxidation products CO and CO2; and HCN is detected in the reaction system containing nitrogen. This indicates that the added gas not only plays the role of diluting the reaction gas in the reaction system, but also directly participates in the reaction process as a gas catalyst or reactant.

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