  The conversion of CO2 and CH4 into value-added chemicals is studied in a new
geometry of a dielectric barrier discharge (DBD) with multi-electrodes,
dedicated to the treatment of high gas flow rates. Gas chromatography is used
to define the CO2 and CH4 conversion as well as the yields of the products of
decomposition (CO, O2 and H2) and of recombination (C2H4, C2H6 and CH2O). The
influence of three parameters is investigated on the conversion: the CO2 and
CH4 flow rates, the plasma power and the nature of the carrier gas (argon or
helium). The energy efficiency of the CO2 conversion is estimated and compared
with those of similar atmospheric plasma sources. Our DBD reactor shows a good
compromise between a good energy efficiency and the treatment of a large CO2
flow rate.
