Methane Decomposition Leading to Deposit Formation in a DC Positive CH4–N2 Corona Discharge

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We have explored the formation of chemical species produced in a positive coaxial corona discharge fed by a mixture of N2 and CH4 at atmospheric pressure and ambient temperature. Gaseous products were detected by IR spectroscopy whilst solid products, deposited on the electrodes, were examined using Scanning Electron Microscopy and Energy Dispersive X-ray Analysis. The temporal evolution of gaseous products C2H2, HCN and C2H6 are also reported. These results may assist in the interpretation of results from the recent Cassini Huygens space mission as they may provide a simulation of the chemical processes occuring in Titan’s atmosphere.