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<p>The denitrification performance of 2%Fe/X zeolite and Mn-2%Fe/X zeolite was investigated by hydrothermal synthesis of X zeolite without templating agent using alkali fusion-activated rare-earth tailings and fly ash as raw materials instead of pure chemical reagents, and the Mn-Fe co-loaded Mn-Fe/X zeolite was prepared by impregnation method. The denitrification activity results showed that the 2%Fe/X zeolite reached an optimum denitrification efficiency of 67% at 400&#xa0;°C. The addition of Mn makes the activity shifted to lower temperatures. The denitrification efficiency of the 8%Mn-2%Fe/X zeolite catalyst at 250&#xa0;°C was 97%. The characterization results showed that the Fe element in the rare earth tailings entered into the X zeolite in the form of Fe<sup>3+</sup>, which enabled it to maintain excellent denitrification activity even at medium and high temperatures. After the introduction of Mn, there was a synergistic effect between Mn and Fe, which resulted in a shift in the binding energy of Fe<sup>3+</sup> and a decrease in the density of the surrounding electron cloud. The high concentration of Mn<sup>4+</sup> and Mn<sup>3+</sup> improved the low-temperature oxidation performance, and increased the number of acidic sites and adsorbed oxygen on the surface, which led to a better denitrification activity for the 8%Mn-2%Fe/X zeolite catalysts.</p>

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Study on de-NOx characteristics of selective catalytic reduction with NH3 of 2%Fe/X zeolite modified by Mn

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Xiaoqian Hou,
  • Jiachi Li,
  • Zongnan Li,
  • Zhiyu Zhang,
  • Limin Hou

摘要

The denitrification performance of 2%Fe/X zeolite and Mn-2%Fe/X zeolite was investigated by hydrothermal synthesis of X zeolite without templating agent using alkali fusion-activated rare-earth tailings and fly ash as raw materials instead of pure chemical reagents, and the Mn-Fe co-loaded Mn-Fe/X zeolite was prepared by impregnation method. The denitrification activity results showed that the 2%Fe/X zeolite reached an optimum denitrification efficiency of 67% at 400 °C. The addition of Mn makes the activity shifted to lower temperatures. The denitrification efficiency of the 8%Mn-2%Fe/X zeolite catalyst at 250 °C was 97%. The characterization results showed that the Fe element in the rare earth tailings entered into the X zeolite in the form of Fe3+, which enabled it to maintain excellent denitrification activity even at medium and high temperatures. After the introduction of Mn, there was a synergistic effect between Mn and Fe, which resulted in a shift in the binding energy of Fe3+ and a decrease in the density of the surrounding electron cloud. The high concentration of Mn4+ and Mn3+ improved the low-temperature oxidation performance, and increased the number of acidic sites and adsorbed oxygen on the surface, which led to a better denitrification activity for the 8%Mn-2%Fe/X zeolite catalysts.