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<p>Besides the conversion efficiency of CO/HC/NO, The production of NH<sub>3</sub> is also a crucial concern for three-way catalysts applied in passive selective catalytic reduction operation. In this work, Al<sub>2</sub>O<sub>3</sub> powders pretreated at different temperatures (750, 900, 1000, 1100&#xa0;°C) were used to synthesis Pd/Al<sub>2</sub>O<sub>3</sub> catalysts. The evaluation results of the catalytic performance reveal that when Al<sub>2</sub>O<sub>3</sub> was preliminarily treated at 1000&#xa0;°C, the obtained Pd/Al1000 catalyst exhibits superior three-way catalytic performance, including higher conversion efficiency of CO/HC/NO and particularly larger production of NH<sub>3</sub>. To unveil the relationship between the catalytic performance of the Pd/Al<sub>2</sub>O<sub>3</sub> catalysts and their physicochemical properties, the catalysts were characterized by a range of techniques. It is found that with optimum pretreatment temperature of Al<sub>2</sub>O<sub>3</sub> (1000&#xa0;°C), a favorable combination of δ-Al<sub>2</sub>O<sub>3</sub> and θ-Al<sub>2</sub>O<sub>3</sub> phase is detected in Pd/Al1000. Moreover, Pd/Al1000 displays high dispersion of Pd species, more oxygen vacancies, outstanding reduction capability and larger amount of weak/moderate acid sites, which together contribute to its superior three-way catalytic performance.</p>

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Unveiling the influence of pretreatment temperature of Al2O3 on performance of Pd/Al2O3 three-way catalyst for passive selective catalytic reduction operation

  • 期刊论文

  • 发表日期：

    2025年12月24日

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  • Yongxiang Yu,
  • Nengfei Qiu,
  • Wenjing He,
  • Yanmei Kong,
  • Meihua Zhu,
  • Huasheng Lin,
  • Liang Shen,
  • Li Lan,
  • Shanhu Chen

摘要

Besides the conversion efficiency of CO/HC/NO, The production of NH3 is also a crucial concern for three-way catalysts applied in passive selective catalytic reduction operation. In this work, Al2O3 powders pretreated at different temperatures (750, 900, 1000, 1100 °C) were used to synthesis Pd/Al2O3 catalysts. The evaluation results of the catalytic performance reveal that when Al2O3 was preliminarily treated at 1000 °C, the obtained Pd/Al1000 catalyst exhibits superior three-way catalytic performance, including higher conversion efficiency of CO/HC/NO and particularly larger production of NH3. To unveil the relationship between the catalytic performance of the Pd/Al2O3 catalysts and their physicochemical properties, the catalysts were characterized by a range of techniques. It is found that with optimum pretreatment temperature of Al2O3 (1000 °C), a favorable combination of δ-Al2O3 and θ-Al2O3 phase is detected in Pd/Al1000. Moreover, Pd/Al1000 displays high dispersion of Pd species, more oxygen vacancies, outstanding reduction capability and larger amount of weak/moderate acid sites, which together contribute to its superior three-way catalytic performance.