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<p>In this work, Pd/La<sub>2</sub>O<sub>3</sub>-Al<sub>2</sub>O<sub>3</sub> three-way catalyst (TWC) was modified by secondary introduction of La<sub>2</sub>O<sub>3</sub>, which shows remarkable superiority in catalytic performance. That is, higher conversions of CO, HC and NO are achieved, and moreover, the production of NH<sub>3</sub> is promoted, additionally, the air-fuel-ratio window performance is improved, making the catalyst more desirable for application as a TWC in passive selective catalytic reduction (pSCR) technique. To disclose the detailed reasons for the modification efficiency, the catalysts were analyzed by a range of characterization techniques. The results reveal that after secondary introduction of appropriate amount of La<sub>2</sub>O<sub>3</sub> (2 wt%), besides γ-Al<sub>2</sub>O<sub>3</sub>, a new LaAlO<sub>3</sub> phase is presented in the modified catalyst, which helps promote the dispersion and modify the chemical state of the Pd species, moreover, the modified catalyst exhibits improved reduction capability and excellent low-temperature desorption performance of NH<sub>3</sub>, which is advantageous to the conversions of CO/HC/NO as well as the production of NH<sub>3</sub>.</p> Graphical Abstract <p></p>

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Modification of Pd/La2O3-Al2O3 Three-Way Catalyst by Secondary Introduction of La2O3 for Passive Selective Catalytic Reduction Operation

  • 期刊论文

  • 发表日期：

    2025年12月2日

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  • Nianzhi Tao,
  • Wenjing He,
  • Yanmei Kong,
  • Meihua Zhu,
  • Huasheng Lin,
  • Shuanghua Cheng,
  • Liang Shen,
  • Li Lan,
  • Shanhu Chen

摘要

In this work, Pd/La2O3-Al2O3 three-way catalyst (TWC) was modified by secondary introduction of La2O3, which shows remarkable superiority in catalytic performance. That is, higher conversions of CO, HC and NO are achieved, and moreover, the production of NH3 is promoted, additionally, the air-fuel-ratio window performance is improved, making the catalyst more desirable for application as a TWC in passive selective catalytic reduction (pSCR) technique. To disclose the detailed reasons for the modification efficiency, the catalysts were analyzed by a range of characterization techniques. The results reveal that after secondary introduction of appropriate amount of La2O3 (2 wt%), besides γ-Al2O3, a new LaAlO3 phase is presented in the modified catalyst, which helps promote the dispersion and modify the chemical state of the Pd species, moreover, the modified catalyst exhibits improved reduction capability and excellent low-temperature desorption performance of NH3, which is advantageous to the conversions of CO/HC/NO as well as the production of NH3.

Graphical Abstract