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Atomic-Scale Behavior of Perovskite-Supported Ir-Pd-Ru Nanoparticles under Redox Atmospheres
Xuan Quy Tran1, Tomokazu Yamamoto1,2, Kohei Aso1,3
1Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
Nano Letters
|August 22, 2024
Summary
Smart catalysts offer advanced automotive emission control by reversibly switching precious metals between metallic and ionic states. This study provides atomic-scale evidence for this self-regenerating mechanism in Ir-Pd-Ru nanocatalysts.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Automotive emission control relies on precious metal catalysts.
- "Smart catalysts" offer potential for efficient precious metal utilization.
- The precise mechanism of smart catalyst operation remains debated.
Purpose of the Study:
- To provide direct, atomic-scale evidence for the smart catalyst mechanism.
- To elucidate the behavior of Ir-Pd-Ru nanocatalysts under redox conditions.
- To understand the role of precious metal dissolution and exsolution.
Main Methods:
- Advanced scanning transmission electron microscopy (STEM).
- In situ observation of LaFe0.95Pd0.05O3-supported Ir-Pd-Ru nanocatalysts.
- Analysis under fluctuating oxidizing/reducing atmospheres.
Main Results:
- Demonstrated reversible dissolution and exsolution of Iridium (Ir) and Ruthenium (Ru) at the atomic scale.
- Observed limited dissolution of Palladium (Pd).
- Confirmed cooperative alloying of all three metals upon reduction, preserving catalytic activity.
Conclusions:
- The study provides definitive evidence for the smart catalyst mechanism involving reversible precious metal transformation.
- This mechanism enhances catalytic activity and self-regeneration in automotive emission control.
- Understanding selective dissolution is key to designing next-generation catalysts.
