Scholarlink

<p>Selective catalytic reduction (SCR) using ammonia (NH<sub>3</sub>) effectively reduces NOx from industrial flue gases but faces deactivation by alkali/sulfur compounds, particularly sodium sulfate (Na<sub>2</sub>SO<sub>4</sub>) from high-sodium coal combustion. Na<sub>2</sub>SO<sub>4</sub> deactivates commercial V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> catalysts by reducing acidity, redox properties, and blocking sites. This work developed a novel Fe<sub>2</sub>O<sub>3</sub>-MoO<sub>3</sub>/TiO<sub>2</sub>-HY (Fe<sub>x</sub>MT<sub>y</sub>HY<sub>z</sub>) catalyst. Fe<sub>1.5</sub>MT<sub>3</sub>HY<sub>5.5</sub> (15 wt% Fe<sub>2</sub>O<sub>3</sub>, 30 wt% MoO<sub>3</sub> supported on TiO<sub>2</sub>, with HY as the balance) exhibits exceptional resistance to alkali/sulfur poisoning, maintaining &gt; 90% NOx conversion at 310–380&#xa0;°C after Na<sub>2</sub>SO<sub>4</sub> doping. This resilience stems from synergistic effects: MoO<sub>3</sub> layered structure and the HY zeolite porosity preferentially capture Na<sup>+</sup> via ion exchange, while MoO<sub>3</sub> activates surface sulfates to mitigate active site blockage. Fe<sub>1.5</sub>MT<sub>3</sub>HY<sub>5.5</sub> demonstrates high potential as an efficient SCR catalyst for flue gases containing Na<sup>+</sup> and SO<sub>2</sub><sup>4−</sup>.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhancing Catalyst Durability: Fe2O3-MoO3/TiO2-HY for Robust NOX Reduction in Severe Alkaline and Sulfur-Rich Flue Gas Environments

  • 期刊论文

  • 发表日期：

    2025年10月22日

查看全文
  • Jing Dong,
  • Lipeng Wang,
  • Zhiwei Huang,
  • Huawang Zhao,
  • Xiaomin Wu,
  • Huazhen Shen,
  • Guohua Jing

摘要

Selective catalytic reduction (SCR) using ammonia (NH3) effectively reduces NOx from industrial flue gases but faces deactivation by alkali/sulfur compounds, particularly sodium sulfate (Na2SO4) from high-sodium coal combustion. Na2SO4 deactivates commercial V2O5-WO3/TiO2 catalysts by reducing acidity, redox properties, and blocking sites. This work developed a novel Fe2O3-MoO3/TiO2-HY (FexMTyHYz) catalyst. Fe1.5MT3HY5.5 (15 wt% Fe2O3, 30 wt% MoO3 supported on TiO2, with HY as the balance) exhibits exceptional resistance to alkali/sulfur poisoning, maintaining > 90% NOx conversion at 310–380 °C after Na2SO4 doping. This resilience stems from synergistic effects: MoO3 layered structure and the HY zeolite porosity preferentially capture Na+ via ion exchange, while MoO3 activates surface sulfates to mitigate active site blockage. Fe1.5MT3HY5.5 demonstrates high potential as an efficient SCR catalyst for flue gases containing Na+ and SO24−.

Graphical Abstract