The Synthesis Of C₂ Hydrocarbons From Methane Under Plasma-Catalyze In Hydrogen Conditions

The methane is principal constituent of the natural gas,the content of methane is generally about 95%.The CH₄ resource is rich in the nature.It is extremely significant to develop and apply in safeguarding the 21st century energy supplement.The natural gas gaseous state characteristic enable it to have merits such as convenient,clean,the higher thermal efficiency as the energy.Its transformation characteristic causes it all unfolded the broad prospects for development,in the utilization of a carbonization study,the organic synthesis and the hydrocarbon processing,the natural gas associated(H₂,O₂,N₂,CO₂ as well as helium,argon noble gases and so on)aspects and so on.The pulse corona plasma is a novel technology of non-equilibrium plasma generated by highly DC voltage,in which conditions the electron temperature is very high but the ionic or molecular temperature is low.So the great advantages of pulse corona plasma is that less energy goes into activating any stability simple molecular,such as NOx and SOx.In this study, pulse corona plasma combined with catalysts,was used convert CH₄ towards C₂ hydrocarbons,and provides a new rout for activating CH₄.The conclusions obtained from this study are summarized as follows:1.At ambient temperature and atmosphere,effectively converted into methane under pulse corona plasma,at the conditions of the ratio of V(CH₄)/V(H₂)=1:3.The conversion of CH₄ is 21.8%and the selectivity of C₂ is 43.1%.2.The methane coupling reaction in the hydrogen was realized under pulse corona plasma at ambient temperature and atmosphere.Under pulse corona plasma the conversion of CH₄ is 21.8%and the selectivity of C₂ is 43.1%.In the pulse corona plasma combined with catalysts was used to convert CH₄/H₂ towards C₂ hydrocarbons,the selectivity is 18.4%and the yield of C₂H₄ is 10.3%.3.The analysis results of OES show that the conversion reactions of CH₄/H₂ are both radical mechanisms under pulse corona plasma.While the conversion CH₄ into C₂ hydrocarbons under plasma with catalyst,the plasma mostly activates the reactants and catalysts,and the catalyst affects the selectivity of products.4.The analytic results of TG,IR,XRD show the coking of the catalyst mainly results from the deposit of amorphous carbon and hydrocarbons of highly molecular weight,formed from carbon species that dissociated CH₄ by plasma and the active species produced by CH₄ plasma.