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Developing the science of self-healing catalysts
Abhaya K Datye1, Hien Pham1, Andrew DeLaRiva1
1University of New Mexico, Department of Chemical & Biological Engineering and Center for Micro Engineered Materials, Albuquerque, NM, 87131, USA. datye@unm.edu.
Faraday Discussions
|May 14, 2026
Summary
Designing robust heterogeneous catalysts is key to preventing performance loss, especially for emission-control systems. This study reveals design features enabling self-healing mechanisms in catalysts, crucial for long-term operation without regeneration.
Area of Science:
- Materials Science
- Chemical Engineering
- Catalysis
Background:
- Heterogeneous catalysts degrade over time due to sintering, particularly at high temperatures, leading to performance loss.
- Emission-control catalysts in vehicles cannot be taken offline for regeneration, necessitating designs that maintain activity during operation.
- Sintering, primarily via Ostwald ripening, causes nanoparticle growth and surface area loss, reducing catalyst effectiveness.
Purpose of the Study:
- To identify design features that enable emission-control catalysts to mitigate activity loss under operational conditions.
- To understand why specific metal/support combinations exhibit superior performance and durability.
- To explore self-healing mechanisms in catalysts for sustained activity without regeneration.
Main Methods:
- Subjecting catalysts to accelerated aging protocols simulating industrial screening conditions.
- Utilizing high-temperature steam treatments (800-980°C+) under oxidizing and cyclic reducing/oxidizing conditions.
- Analyzing sintering mechanisms, focusing on Ostwald ripening and atomic mobility.
Main Results:
- Identified Ostwald ripening as the primary sintering mechanism at elevated temperatures.
- Observed that three-way catalysts exhibit self-healing opportunities due to oscillatory conditions, unlike diesel oxidation catalysts.
- Demonstrated that trapping mobile species and reconstituting active sites are crucial for indefinite catalyst operation.
Conclusions:
- Catalyst design must incorporate features for trapping atoms and reconstituting active sites to prevent sintering and ensure longevity.
- Self-healing behavior, facilitated by oscillatory conditions in three-way catalysts, offers a pathway to robust catalyst design.
- Insights gained can guide the development of next-generation heterogeneous catalysts with enhanced durability for emission control.
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