Effects of Sound-wave Irradiation on Decomposition of Carbon Dioxide in DC-pulse Discharge Field

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  • Okada Masaki
    Dept. of Applied Molecular Chemistry, College of Industrial Technology, Nihon University
  • Nakane Tomoo
    Dept. of Electrical and Electronic Engineering, College of Industrial Technology, Nihon University
  • Harada Daisuke
    Dept. of Applied Molecular Chemistry, College of Industrial Technology, Nihon University
  • Shigeta Gen
    Dept. of Applied Molecular Chemistry, College of Industrial Technology, Nihon University
  • Furukawa Shigeki
    Dept. of Applied Molecular Chemistry, College of Industrial Technology, Nihon University
  • Suzuki Yohichi
    Dept. of Applied Molecular Chemistry, College of Industrial Technology, Nihon University
  • Yamaguchi Tatsuaki
    Dept. of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology
  • Onoe Kaoru
    Dept. of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology

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Other Title
  • 直流パルス放電場での二酸化炭素の分解反応に対する音波の照射効果

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The effects of sound-wave irradiation were investigated on the decomposition of carbon dioxide in a discharge plasma. Discharge plasma supplies high local energy levels, as charged medium particles, so chemical reactions ungoverned by thermodynamics can occur. However, the discharge space is extremely confined, which restricts the conversion rate. This study investigated the combination of plasma and sound-wave irradiation, which increases the vibration motion of the medium. A streamer was observed to expand into a fan shape on irradiation of sound waves. The expansion of the discharge space was positively correlated with the magnitude of the sound. Accordingly, the effects of sound-wave irradiation on the direct decomposition of carbon dioxide were evaluated. The decomposition rate of carbon dioxide (rCO2) increased with sound pressure at the closed end of the sound tube, and rCO2 at 1.8 kPa approximately increased to approximately twice that for no sound-wave irradiation. This increase in rCO2 resulted from the improvement in the reaction probability due to expansion of the discharge space and increased vibration of the charged particles.

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