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The effects of sound wave irradiation were investigated on the efficiency of chemical reaction and product distribution in plasma field generated by DC pulse discharge. Since the discharge plasma provides high energy locally, various chemical reactions ungoverned by thermodynamics can occur. However, the discharge space is extremely confined, which restricts the conversion of feed gas. In this work, the combination of discharge plasma and sound wave irradiation, which increases the vibration motion of the medium particle, was studied. An expansion of streamer into a fan-shape was observed with the irradiation of sound wave. The expansion of the discharge space was positively correlated with the vibration speed of the medium particle (Vs). Accordingly, the effects of sound wave irradiation on the methane conversion (XCH4) were evaluated. When methane diluted in argon (mole fraction of methane was 0.1) was used as the feed gas, methane conversion increased with Vs, and XCH4 at 3.0 m/s of Vs increased to approximately twice that for no sound wave irradiation. This increase in XCH4 resulted from the improvement in the reaction probability due to expansion of the discharge field and change of discharge properties. On the other hand, hydrogen formation and oily and deposit compounds formation were slightly increased. Therefore the enhancement of reaction efficiency and the possibility of product-control of plasma reaction by sound wave combined process were suggested.

Effect of Sound Wave Irradiation on Methane Conversion in DC Pulse Discharge Plasma