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<p>In this study, we used a low-pressure radio-frequency plasma operating at a frequency of 145&#xa0;MHz to dissociate the CO<sub>2</sub>. It examines the effects of pressure (60, 100, and 150&#xa0;Pa) and humidity (&lt; 1%) on plasma assisted CO<sub>2</sub> products. Optical emission spectroscopy analyzed the different dissociation products of CO<sub>2</sub> under all treatment conditions. Additionally, SPECAIR software was used to calculate electronic, rotational and vibrational temperatures at different treatment conditions. Electronic, rotational, and vibrational temperature measurements of the CO<sub>2</sub> plasma with or without humidity reveal in the range of 0.93–1.40&#xa0;eV, 943–1168&#xa0;K, and 4611–7890&#xa0;K, respectively, at various pressure conditions. This information was subsequently used to perform a 0D simulation using COMSOL Multiphysics to study changes in the density of reactive species produced after CO<sub>2</sub> dissociation. Analysis of experimental and simulation data suggests that the reaction between atomic oxygen (O) and carbon monoxide ions (CO<sup>+</sup>) may play an important role in the formation of carbon monoxide (CO).</p>

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Low-Pressure Plasma-Assisted CO2 Decomposition: A Comparative Study Under Dry and Wet Conditions

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Pankaj Attri,
  • Hibiki Otobe,
  • Takamasa Okumura,
  • Kazunori Koga,
  • Masaharu Shiratani

摘要

In this study, we used a low-pressure radio-frequency plasma operating at a frequency of 145 MHz to dissociate the CO2. It examines the effects of pressure (60, 100, and 150 Pa) and humidity (< 1%) on plasma assisted CO2 products. Optical emission spectroscopy analyzed the different dissociation products of CO2 under all treatment conditions. Additionally, SPECAIR software was used to calculate electronic, rotational and vibrational temperatures at different treatment conditions. Electronic, rotational, and vibrational temperature measurements of the CO2 plasma with or without humidity reveal in the range of 0.93–1.40 eV, 943–1168 K, and 4611–7890 K, respectively, at various pressure conditions. This information was subsequently used to perform a 0D simulation using COMSOL Multiphysics to study changes in the density of reactive species produced after CO2 dissociation. Analysis of experimental and simulation data suggests that the reaction between atomic oxygen (O) and carbon monoxide ions (CO+) may play an important role in the formation of carbon monoxide (CO).