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A new W-doped CeO2 catalyst on Cu-Cd-SSZ-13 improves selective catalytic reduction of NOx with ammonia (NH3-SCR) over a wider temperature range and shows enhanced stability after aging.

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Area of Science:

  • Catalysis
  • Materials Science
  • Environmental Chemistry

Background:

  • Selective catalytic reduction (SCR) of nitrogen oxides (NOx) using ammonia (NH3-SCR) is crucial for emission control.
  • Developing highly active and stable catalysts for NH3-SCR remains a significant challenge.

Purpose of the Study:

  • To synthesize and characterize a novel composite catalyst, W-CeO2/Cu-Cd-SSZ-13, for enhanced NH3-SCR performance.
  • To investigate the effect of W-doped CeO2 on the catalytic activity and hydrothermal stability of Cu-Cd-SSZ-13.

Main Methods:

  • *In situ* hydrothermal synthesis was employed to prepare the W-CeO2/Cu-Cd-SSZ-13 catalyst.
  • Catalytic activity and hydrothermal stability were evaluated through NH3-SCR performance tests before and after aging.
  • Characterization techniques were used to analyze the catalyst's properties, including redox behavior and acidity.

Main Results:

  • The W-CeO2/Cu-Cd-SSZ-13 catalyst exhibited a broader temperature window (160-610 °C) for over 90% NOx conversion compared to the unmodified catalyst (160-550 °C).
  • Post-aging, the W-CeO2/Cu-Cd-SSZ-13 catalyst demonstrated significantly improved NOx conversion (e.g., 74.5% at 640 °C) compared to Cu-Cd-SSZ-13 (49.4%).
  • Enhanced redox properties, acidity, and superior hydrothermal stability were attributed to increased Ce3+, isolated Cu2+, and adsorbed oxygen species, along with inhibited dealumination and Cu aggregation.

Conclusions:

  • The incorporation of W-doped CeO2 onto Cu-Cd-SSZ-13 substantially boosts NH3-SCR activity and hydrothermal stability.
  • This catalyst design offers a promising pathway for developing advanced materials for NOx abatement.
  • The study provides valuable insights for designing robust Cu-based zeolite catalysts for environmental applications.