Decomposition of Toluene by Atmospheric Pressure Microwave Discharge Using Carbon Felt

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  • カーボンフェルトを媒体とした大気圧マイクロ波放電によるトルエンの分解
  • カーボンフェルト オ バイタイ ト シタ タイキアツ マイクロハ ホウデン ニ ヨル トルエン ノ ブンカイ

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We examined the decomposition of toluene by atmospheric pressure microwave discharge using carbon felt (CF) as an intriguing medium for sustaining plasma, and studied the decomposition behavior. The discharge was generated easily at 200W microwave power using CF25 which was thermally pretreated at 2500ºC and had a relatively low electric resistance of 0.16Ωcm. The discharge was generated at the gap between each two pieces of CF, however, not generated at the inside of each CF. The temperature of the gap and the intensity of emission from discharging gaps were increased with seconds until they reached an equilibrium state in about 10 seconds. The XPS analysis revealed that the graphite structure of each carbon fiber making CF was maintained through the discharge, that is, the surface of carbon fiber was kept chemically unchanged without binding nitrogen and oxygen atoms. Toluene disappeared completely, and H2 was generated stoichiometrically by discharge in nitrogen or even in air atmosphere. Furthermore, in the case of the discharge in air with toluene, O2 disappeared, and CO and CO2 were generated. H2O, NOx and O3 were not detected. The reaction kinetic consideration revealed that the decomposition of Toluene followed the first-order reaction, the apparent decomposition rate constant of toluene was increased with the number of gaps between CFs in a reaction vessel, and the decomposition rate of toluene was independent of the concentration of O2.<br>

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