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<p>NO<sub><i>x</i></sub> and VOCs emitted from flue gases in nonelectric industries processes constitute major atmospheric pollutants in China. The simultaneous removal of NO<sub><i>x</i></sub> and toluene using selective catalytic reduction (SCR) systems presents a great challenge. In this work, Co-doped MnPO/Ti catalysts (Co-MnPO/Ti) are synthesized for the simultaneous removal of two pollutants at low temperature. The results demonstrate that Co(0.5)-MnPO/Ti presents the highest catalytic activity, which achieved simultaneous conversions exceeding 80% for NO<sub><i>x</i></sub> and 85% for toluene, with over 85% N<sub>2</sub> selectivity at a temperature window of 240–330&#xa0;°C. Furthermore, Co(0.5)-MnPO/Ti exhibits high sulfur and water resistance. Characterization results exhibit that Co has been doped into MnPO/Ti catalyst and it has interacted with Mn. The interaction facilitates electron transfer between Co and Mn, which promotes the surface acidity and redox capability of the catalyst. Moreover, the additional active sites provided by Co doping are responsible for improved adsorption and activation capacities for O<sub>2</sub>, NO, and toluene. Consequently, it exhibits superior simultaneous removal efficiency of NO<sub><i>x</i></sub> and toluene. Finally, in-situ DRIFTs confirm that the catalytic reduction of NO<sub><i>x</i></sub> follows both E-R and L-H mechanisms, while toluene oxidation proceeds via the MvK mechanism.</p> Graphical Abstract <p></p>

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Mechanisms on Simultaneous Removal of NOx and Toluene over Co-doped MnPO/TiO2 Catalyst at Low Temperature

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Yong Jia,
  • Chuanqi Lu,
  • Lina Guo,
  • Jinke Wei,
  • Fanyu Meng,
  • Xilou Ding,
  • Hongming Long,
  • Shule Zhang

摘要

NOx and VOCs emitted from flue gases in nonelectric industries processes constitute major atmospheric pollutants in China. The simultaneous removal of NOx and toluene using selective catalytic reduction (SCR) systems presents a great challenge. In this work, Co-doped MnPO/Ti catalysts (Co-MnPO/Ti) are synthesized for the simultaneous removal of two pollutants at low temperature. The results demonstrate that Co(0.5)-MnPO/Ti presents the highest catalytic activity, which achieved simultaneous conversions exceeding 80% for NOx and 85% for toluene, with over 85% N2 selectivity at a temperature window of 240–330 °C. Furthermore, Co(0.5)-MnPO/Ti exhibits high sulfur and water resistance. Characterization results exhibit that Co has been doped into MnPO/Ti catalyst and it has interacted with Mn. The interaction facilitates electron transfer between Co and Mn, which promotes the surface acidity and redox capability of the catalyst. Moreover, the additional active sites provided by Co doping are responsible for improved adsorption and activation capacities for O2, NO, and toluene. Consequently, it exhibits superior simultaneous removal efficiency of NOx and toluene. Finally, in-situ DRIFTs confirm that the catalytic reduction of NOx follows both E-R and L-H mechanisms, while toluene oxidation proceeds via the MvK mechanism.

Graphical Abstract