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<p>To address the issue regarding the effective removal of NO<sub><i>x</i></sub> under conditions with fluctuating temperatures, developing a catalyst that exhibits satisfactory selective catalytic reduction (SCR) performance in a wide temperature range is the research hotspot in environmental field. In this study, the virgin and NdO<sub><i>x</i></sub>-doped MnCo<sub>2</sub>O<sub>4</sub> spinel catalysts were prepared using the sol-gel method, aiming to investigate the effect of NdO<sub><i>x</i></sub> on SCR performance. The optimal sample, with an Nd/Mn molar ratio of 0.1, showed &gt; 90% NO<sub><i>x</i></sub> conversion within a temperature range of 200–350 °C and maintained &gt; 96% N<sub>2</sub> selectivity over the whole temperature range. The enhanced SCR performance of the NdO<sub><i>x</i></sub>-doped catalysts could be attributed to several factors, including enlarged specific surface area, more developed pore structures, greater acidity and oxidizability, and improved NO oxidation capability. The Langmuir-Hinshelwood mechanism contributed to the SCR reactions for the pristine and NdO<sub><i>x</i></sub>-doped catalysts; doping NdO<sub><i>x</i></sub> improved the reactivity of the formed intermediates during the catalytic cycle. Finally, the NdO<sub><i>x</i></sub>-modified catalyst exhibited better sulfur resistance; during the 10-h sulfur deactivation cycle, catalyst’s NO<sub><i>x</i></sub> conversion remained above 86%, ~ 13% higher than that of the pristine MnCo<sub>2</sub>O<sub>4</sub>. Given its good SCR performance under high gas hourly space velocity conditions, it seems that the NdO<sub><i>x</i></sub>-modified catalyst shows certain industrialization prospects.</p> Graphical abstract <p></p>

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Promotional effect of NdOx on MnCo2O4 spinel oxide for NH3-SCR reaction: activity and mechanism study

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Hong An,
  • Dan Zhang,
  • Yun-wei Xu,
  • Yi-zhen Dong,
  • Dong Ye,
  • Fei-ni Chen,
  • Rui-tang Guo

摘要

To address the issue regarding the effective removal of NOx under conditions with fluctuating temperatures, developing a catalyst that exhibits satisfactory selective catalytic reduction (SCR) performance in a wide temperature range is the research hotspot in environmental field. In this study, the virgin and NdOx-doped MnCo2O4 spinel catalysts were prepared using the sol-gel method, aiming to investigate the effect of NdOx on SCR performance. The optimal sample, with an Nd/Mn molar ratio of 0.1, showed > 90% NOx conversion within a temperature range of 200–350 °C and maintained > 96% N2 selectivity over the whole temperature range. The enhanced SCR performance of the NdOx-doped catalysts could be attributed to several factors, including enlarged specific surface area, more developed pore structures, greater acidity and oxidizability, and improved NO oxidation capability. The Langmuir-Hinshelwood mechanism contributed to the SCR reactions for the pristine and NdOx-doped catalysts; doping NdOx improved the reactivity of the formed intermediates during the catalytic cycle. Finally, the NdOx-modified catalyst exhibited better sulfur resistance; during the 10-h sulfur deactivation cycle, catalyst’s NOx conversion remained above 86%, ~ 13% higher than that of the pristine MnCo2O4. Given its good SCR performance under high gas hourly space velocity conditions, it seems that the NdOx-modified catalyst shows certain industrialization prospects.

Graphical abstract