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Main component of Nitrogen oxides (NOx) for exhausted gas from fossil fuel combustion is nitrogen monoxide (NO). Since NO has relatively low solubility in water, NO oxidation to more soluble nitrogen dioxide (NO2) is required for removal of NO by absorption in water. When hydrogen peroxide (H2O2) aqueous solution is used as an absorbent for NO oxidation, NO removal efficiency is enhanced in comparison with the absence of H2O2 in aqueous solution. In this study, NO oxidation reaction by H2O2 vapor in gas phase was studied in addition to that in aqueous phase. For 5–35wt% of aqueous solution of H2O2, the saturated concentration of H2O2 vapor in gas phase was 20–200ppm at 20 ℃. When 1000–3000ppm of initial concentration of NO was reacted with 200ppm of initial concentration of H2O2 in a nitrogen gas atmosphere, the formation rate of NO2 was evaluated. Rate constant for reaction between NO and H2O2 in gas phase was 7.3 × 10–6 ppm–1·s–1. Removal efficiency of NO calculated by the reaction rate in gas phase in addition to the reaction rate in aqueous phase agreed with the experimental data.

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Enhancement of NO Removal by Hydrogen Peroxide in Gas Phase in Addition to NO Oxidation in Liquid Phase on NOx Absorption Equipment

  • 会议论文

  • 发表日期：

    2025年

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  • Haruumi Takeda,
  • Takafumi Horie,
  • Erika Okita,
  • Makoto Asano,
  • Masahiro Yasuda

摘要

Main component of Nitrogen oxides (NOx) for exhausted gas from fossil fuel combustion is nitrogen monoxide (NO). Since NO has relatively low solubility in water, NO oxidation to more soluble nitrogen dioxide (NO2) is required for removal of NO by absorption in water. When hydrogen peroxide (H2O2) aqueous solution is used as an absorbent for NO oxidation, NO removal efficiency is enhanced in comparison with the absence of H2O2 in aqueous solution. In this study, NO oxidation reaction by H2O2 vapor in gas phase was studied in addition to that in aqueous phase. For 5–35wt% of aqueous solution of H2O2, the saturated concentration of H2O2 vapor in gas phase was 20–200ppm at 20 ℃. When 1000–3000ppm of initial concentration of NO was reacted with 200ppm of initial concentration of H2O2 in a nitrogen gas atmosphere, the formation rate of NO2 was evaluated. Rate constant for reaction between NO and H2O2 in gas phase was 7.3 × 10–6 ppm–1·s–1. Removal efficiency of NO calculated by the reaction rate in gas phase in addition to the reaction rate in aqueous phase agreed with the experimental data.