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<p>Given the complex operational conditions in engineering, this article investigates the effects of Zn and SO<sub>2</sub> on the SCR performance of the CeO<sub>2</sub>-TiO<sub>2</sub> catalyst, a promising candidate for the commercialized V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> system. The loading of Zn or the treatment with SO<sub>2</sub> interfered with SCR catalysis, with the operational temperature range (&gt; 90% NO<sub><i>x</i></sub> conversion) narrowed by approximately 100&#xa0;°C. The reduced surface area, pore volume, acidity, NO adsorption capacity, and oxidizability collectively accounted for the declined NO<sub><i>x</i></sub> conversion of the Zn-poisoned sample, while the excessively strong acidity, together with the damaged textural structures, weakened oxidative ability, and inhibited NO adsorption, contributed to the deactivation of the SO<sub>2</sub>-treated catalyst. For the Zn and SO<sub>2</sub> co-poisoned samples, the proceeding of the SCR reaction was further prohibited, with &gt; 90% NO<sub><i>x</i></sub> conversion achieved only between 350 and 450&#xa0;°C. This was largely ascribed to the declined specific surface area and pore volume. Even though the synergistic effects between SO<sub>2</sub> and Zn could further deactivate the CeTi catalyst, the relevant mechanisms might provide valuable guidance for the wide commercialization of this system.</p>

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Investigating the synergistic poisoning effects of Zn and SO2 over the CeO2-TiO2 SCR catalyst

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Yi-zhen Dong,
  • Dan Zhang,
  • Yun-wei Xu,
  • Dong Ye,
  • Rui-tang Guo

摘要

Given the complex operational conditions in engineering, this article investigates the effects of Zn and SO2 on the SCR performance of the CeO2-TiO2 catalyst, a promising candidate for the commercialized V2O5-WO3/TiO2 system. The loading of Zn or the treatment with SO2 interfered with SCR catalysis, with the operational temperature range (> 90% NOx conversion) narrowed by approximately 100 °C. The reduced surface area, pore volume, acidity, NO adsorption capacity, and oxidizability collectively accounted for the declined NOx conversion of the Zn-poisoned sample, while the excessively strong acidity, together with the damaged textural structures, weakened oxidative ability, and inhibited NO adsorption, contributed to the deactivation of the SO2-treated catalyst. For the Zn and SO2 co-poisoned samples, the proceeding of the SCR reaction was further prohibited, with > 90% NOx conversion achieved only between 350 and 450 °C. This was largely ascribed to the declined specific surface area and pore volume. Even though the synergistic effects between SO2 and Zn could further deactivate the CeTi catalyst, the relevant mechanisms might provide valuable guidance for the wide commercialization of this system.