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<p>The widespread use of biomass in power plants has led to a significant increase in the levels of alkali/alkaline earth metals and phosphorus in the flue gas. This poses a greater challenge to the catalyst. CeMo catalyst is a promising catalyst for NO<sub>x</sub> removal due to its superior properties. Therefore, this study focused on the single and synergistic effects of Na and P on the CeMo catalysts. Fresh CeMo sample showed the best deNO<sub>x</sub> performance, with &gt; 90% NO<sub>x</sub> conversion obtained between 250 and 400&#xa0;°C. Given the addition of Na or P, catalyst acid and redox features were somehow weakened, which inhibited both the adsorption and activation of the reactants. This behavior resulted in an overall decrease in the catalyst activity of about 5–10%. As Na and P were co-introduced, the NO<sub>x</sub> conversion efficiency dropped sharply to below 80% within the investigated temperature range. It could be attributed to the fact that the above-mentioned two chemical properties were further negatively affected, which exerted a more pronounced inhibitory effect on the SCR reactions. This work provides insights into the effect of synergistic poisoning on the catalyst properties, laying a solid foundation for the development of new catalysts with excellent resistance ability to multiple poisoning.</p>

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Synergistic poisoning of Na and P over CeO2-MoO3 catalyst for selective catalytic reduction with NH3

  • 期刊论文

  • 发表日期：

    2025年1月8日

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  • Yi-feng Xu,
  • Rui-tang Guo,
  • Jin-fan Deng,
  • Sheng-jie Zhao,
  • De-ming Wu,
  • Wei-guo Pan

摘要

The widespread use of biomass in power plants has led to a significant increase in the levels of alkali/alkaline earth metals and phosphorus in the flue gas. This poses a greater challenge to the catalyst. CeMo catalyst is a promising catalyst for NOx removal due to its superior properties. Therefore, this study focused on the single and synergistic effects of Na and P on the CeMo catalysts. Fresh CeMo sample showed the best deNOx performance, with > 90% NOx conversion obtained between 250 and 400 °C. Given the addition of Na or P, catalyst acid and redox features were somehow weakened, which inhibited both the adsorption and activation of the reactants. This behavior resulted in an overall decrease in the catalyst activity of about 5–10%. As Na and P were co-introduced, the NOx conversion efficiency dropped sharply to below 80% within the investigated temperature range. It could be attributed to the fact that the above-mentioned two chemical properties were further negatively affected, which exerted a more pronounced inhibitory effect on the SCR reactions. This work provides insights into the effect of synergistic poisoning on the catalyst properties, laying a solid foundation for the development of new catalysts with excellent resistance ability to multiple poisoning.