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<p>Nitrogen oxides (NOx), carbon monoxide (CO), and methane (CH<sub>4</sub>) are co-emitted at the start-up of LNG combined-cycle power plants. Simultaneous oxidation using mixed metal oxide catalysts is applied to remove these pollutants. Mn, Cu, Ce, MnCu, MnCe, and MnCuCe oxides supported on Al<sub>2</sub>O<sub>3</sub> catalysts were prepared, and their catalytic activities were investigated. Among them, the MnCuCe/Al<sub>2</sub>O<sub>3</sub> catalyst exhibited the highest conversions: 38% for NO at 250&#xa0;°C, 95% for CO at 200&#xa0;°C, and 35% for CH<sub>4</sub> at 500&#xa0;°C. These superior catalytic performances were attributed to its amorphous structure, strong electronic interactions among metal ions, and an abundance of surface-active oxygen species. Catalytic activity tests showed that NO promoted the oxidation of CO and CH<sub>4</sub>. Furthermore, temperature-programmed oxidation reactions indicated that NO, CO, and CH<sub>4</sub> oxidation are competitive reactions on the active sites. However, it was suggested that some of the NO<sub>2</sub> produced from NO oxidation acts as oxidants for CO and CH<sub>4</sub> to promote their oxidation. The findings of this study provide novel insights into the simultaneous removal of exhaust gases emitted from industrial combustion.</p>

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Simultaneous oxidation of NO, CO, and CH4 from exhaust gas in LNG combined cycle power plant over MnCuCeOx/Al2O3 catalyst

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Ji Eun Jeong,
  • Yeon Jeong Jo,
  • Inyoung Lee,
  • Jun-Han Kim,
  • Min Eui Lee,
  • Hyunjoung Jo,
  • Chang-Yong Lee

摘要

Nitrogen oxides (NOx), carbon monoxide (CO), and methane (CH4) are co-emitted at the start-up of LNG combined-cycle power plants. Simultaneous oxidation using mixed metal oxide catalysts is applied to remove these pollutants. Mn, Cu, Ce, MnCu, MnCe, and MnCuCe oxides supported on Al2O3 catalysts were prepared, and their catalytic activities were investigated. Among them, the MnCuCe/Al2O3 catalyst exhibited the highest conversions: 38% for NO at 250 °C, 95% for CO at 200 °C, and 35% for CH4 at 500 °C. These superior catalytic performances were attributed to its amorphous structure, strong electronic interactions among metal ions, and an abundance of surface-active oxygen species. Catalytic activity tests showed that NO promoted the oxidation of CO and CH4. Furthermore, temperature-programmed oxidation reactions indicated that NO, CO, and CH4 oxidation are competitive reactions on the active sites. However, it was suggested that some of the NO2 produced from NO oxidation acts as oxidants for CO and CH4 to promote their oxidation. The findings of this study provide novel insights into the simultaneous removal of exhaust gases emitted from industrial combustion.