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<p>In this study, a series of WO<sub>3</sub>–CeO<sub>2</sub> catalysts was prepared by precipitation methods for selective catalyst reduction (SCR) of NO by NH<sub>3</sub>. The promotion of WO<sub>3</sub> doping synergistically acted with microwave on the performance over CeO<sub>2</sub>-based catalysts was systematically investigated. The results demonstrated the significant enhancement in the low-temperature NH<sub>3</sub>-SCR performance of the catalysts with WO<sub>3</sub> doping. Among them, the 20WO<sub>3</sub>–CeO<sub>2</sub> catalyst achieved over 90% NO<sub>x</sub> conversion in the temperature range of 120–260&#xa0;°C. After multiple cyclic tests under microwave irradiation, it reached 95% NO conversion at 140&#xa0;°C and maintained up to 200&#xa0;°C. The structural and physicochemical properties of the catalysts were characterized by techniques, such as SEM, XRD, Raman, XPS, H<sub>2</sub>-TPR and NH<sub>3</sub>-TPD. The characterization results confirmed a strong interaction between CeO<sub>2</sub> and WO<sub>3</sub> in the catalysts. The WO<sub>3</sub> species existed mainly in an amorphous or highly dispersed state, providing abundant acidic sites. The 20WO<sub>3</sub>–CeO<sub>2</sub> catalyst exhibited a higher specific surface area and a greater concentration of Ce<sup>3+</sup> species. After cyclic evaluations in the microwave field, no significant change was detected in the structure, specific surface area and hydrogen consumption of the catalysts, suggesting the remarkable stability in both structure and properties. The synergistic “microwave activation” effect with WO<sub>3</sub>–CeO<sub>2</sub> catalysts optimized the redox properties and surface acidity, thereby achieving highly efficient and stable DeNO<sub>x</sub> performance at low temperatures.</p> Graphical abstract <p></p>

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Microwave-promoted low-temperature activity of WO3–CeO2 for selective catalytic reduction of NO by NH3

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Xiaoqian Cheng,
  • Boxuan Song,
  • Yao Cheng,
  • Xiangru Li,
  • Zhiwei Cheng,
  • Mengyi Kou,
  • Liyun Song,
  • Hong He,
  • Guizhen Zhang,
  • Ningqiang Zhang

摘要

In this study, a series of WO3–CeO2 catalysts was prepared by precipitation methods for selective catalyst reduction (SCR) of NO by NH3. The promotion of WO3 doping synergistically acted with microwave on the performance over CeO2-based catalysts was systematically investigated. The results demonstrated the significant enhancement in the low-temperature NH3-SCR performance of the catalysts with WO3 doping. Among them, the 20WO3–CeO2 catalyst achieved over 90% NOx conversion in the temperature range of 120–260 °C. After multiple cyclic tests under microwave irradiation, it reached 95% NO conversion at 140 °C and maintained up to 200 °C. The structural and physicochemical properties of the catalysts were characterized by techniques, such as SEM, XRD, Raman, XPS, H2-TPR and NH3-TPD. The characterization results confirmed a strong interaction between CeO2 and WO3 in the catalysts. The WO3 species existed mainly in an amorphous or highly dispersed state, providing abundant acidic sites. The 20WO3–CeO2 catalyst exhibited a higher specific surface area and a greater concentration of Ce3+ species. After cyclic evaluations in the microwave field, no significant change was detected in the structure, specific surface area and hydrogen consumption of the catalysts, suggesting the remarkable stability in both structure and properties. The synergistic “microwave activation” effect with WO3–CeO2 catalysts optimized the redox properties and surface acidity, thereby achieving highly efficient and stable DeNOx performance at low temperatures.

Graphical abstract