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Steam-Activated Lattice Oxygen Enhances Interfacial Redox Stability for Low-Temperature N2O Decomposition over
Ningqiang Zhang1,2, Chenxi He2, Yuan Jing2
1School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, P.R. China.
Angewandte Chemie (International Ed. in English)
|October 23, 2025
Summary
Steam treatment activates lattice oxygen in rhodium-ceria (Rh-CeO2) catalysts, significantly boosting low-temperature N2O decomposition. This study reveals how activated oxygen enhances catalytic performance and stability.
Area of Science:
- Catalysis
- Surface Science
- Materials Chemistry
Background:
- Surface lattice oxygen activation is key for low-temperature oxidation.
- Steam treatment's effect on ceria catalysts is not fully understood.
- Low-temperature N2O decomposition requires efficient catalysts.
Purpose of the Study:
- To investigate the mechanism of steam-activated lattice oxygen in Rh-CeO2 catalysts.
- To understand the role of activated oxygen in low-temperature N2O decomposition.
- To provide insights for designing advanced redox catalysts.
Main Methods:
- Isotope-labeled steam (H2 18O) tracing.
- In situ ambient-pressure X-ray photoelectron spectroscopy (AP-XPS).
- In situ X-ray absorption spectroscopy (XAS).
Main Results:
- High-temperature steam treatment activates lattice oxygen at the Rh-CeO2 interface.
- Activated oxygen species facilitate oxygen desorption.
- Enhanced redox cycling stability of Rh and Ce species was observed.
- Catalytic activity for N2O decomposition significantly improved at low temperatures.
Conclusions:
- Steam-induced lattice oxygen activation is a critical pathway for enhancing low-temperature catalysis.
- Activated oxygen species improve catalytic efficiency and stability.
- Mechanistic understanding guides the design of next-generation redox catalysts.
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