Ionic liquids as novel catalysts for methane conversion under a DC discharge plasma

Nine imidazolium-based ionic liquids were investigated as novel catalysts for methane conversion in a direct current (DC) discharge plasma reactor. The conversion of methane increased from 21.2% to 43.6% in the plasma system when the C6MIMHSO4 IL was used as a catalyst, C6MIMBF4 successfully achieved 91.0% selectivity for C2 hydrocarbons. The results of the optical emission spectroscopy indicate that the intensity of the C2, CH, H, C+, and C active species from methane decomposition increased when C6MIMHSO4, C6MIMCF3COO, and C6MIMBF4 were introduced into the plasma system. FTIR analysis indicates that C6MIMBF4 is steady in the DC discharge plasma.

Figure optionsDownload high-quality image (284 K)Download as PowerPoint slideHighlights
► Nine imidazolium-based ionic liquids as catalysts in gas–liquid plasma.
► Catalysts for methane converting to C2 hydrocarbons in CH4–H2 plasma system.
► Ionic liquids increase the optical spectrum intensity of C2, CH, H, C+, and C species.
► Ionic liquid is steady under cold plasma.