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<p>The (Ce, La)PO<sub>4</sub> catalyst was synthesized utilizing the hydrothermal method. Calcination, a crucial step in catalyst preparation, was performed under four distinct conditions: muffle, microwave, N<sub>2</sub>, and O<sub>2</sub> atmospheres. This study examined the impact of these calcination conditions on the Selective Catalytic Reduction (SCR) activity, as well as the physical and chemical properties of the (Ce, La)PO<sub>4</sub> catalysts. The microwave calcination condition was found to decrease the crystallinity of the samples and enhance the dispersion of active material on the catalyst surface compared to the other methods. Based on the results of Brunauer–Emmett–Teller (BET) and NH<sub>3</sub>-Temperature Programmed Desorption (NH<sub>3</sub>-TPD) analyses, microwave calcination not only increased the specific surface area of the samples but also revealed more acidic sites on the catalyst surface, thereby improving the adsorption–desorption performance for NH<sub>3</sub>. Furthermore, microwave calcination enhanced the redox performance of the catalyst and consequently improved the NO<sub><i>x</i></sub> conversion efficiency. In-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) analysis suggested that the Selective Catalytic Reduction on the (Ce, La)PO<sub>4</sub> catalyst surface followed both the Langmuir–Hinshelwood and Eley–Rideal mechanisms. A comparative analysis of the effects of different calcination conditions on catalyst performance revealed that microwave calcination was the most effective in enhancing catalyst performance. This finding provides valuable guidance for catalyst synthesis.</p>

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Study on denitrification performance and mechanism of (Ce, La)PO4 under different calcination conditions

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Na Li,
  • Jingqi Li,
  • Ting Wang,
  • Xinyu Li,
  • Ruifang Wang,
  • Zhiyu Zhang

摘要

The (Ce, La)PO4 catalyst was synthesized utilizing the hydrothermal method. Calcination, a crucial step in catalyst preparation, was performed under four distinct conditions: muffle, microwave, N2, and O2 atmospheres. This study examined the impact of these calcination conditions on the Selective Catalytic Reduction (SCR) activity, as well as the physical and chemical properties of the (Ce, La)PO4 catalysts. The microwave calcination condition was found to decrease the crystallinity of the samples and enhance the dispersion of active material on the catalyst surface compared to the other methods. Based on the results of Brunauer–Emmett–Teller (BET) and NH3-Temperature Programmed Desorption (NH3-TPD) analyses, microwave calcination not only increased the specific surface area of the samples but also revealed more acidic sites on the catalyst surface, thereby improving the adsorption–desorption performance for NH3. Furthermore, microwave calcination enhanced the redox performance of the catalyst and consequently improved the NOx conversion efficiency. In-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) analysis suggested that the Selective Catalytic Reduction on the (Ce, La)PO4 catalyst surface followed both the Langmuir–Hinshelwood and Eley–Rideal mechanisms. A comparative analysis of the effects of different calcination conditions on catalyst performance revealed that microwave calcination was the most effective in enhancing catalyst performance. This finding provides valuable guidance for catalyst synthesis.