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Novel embedded Pd@CeO(2) catalysts: a way to active and stable catalysts
Matteo Cargnello1, Tiziano Montini, Stefano Polizzi
1Chemistry Department, ICCOM-CNR Trieste Research Unit, Centre of Excellence for Nanostructured Materials (CENMAT) and INSTM Trieste Research Unit, University of Trieste, Via L. Giorgieri 1, 34127, Trieste, Italy.
Embedding palladium (Pd) nanoparticles within ceria (CeO2) can enhance catalyst stability for the water-gas-shift (WGS) reaction, even when nanoparticle accessibility is reduced.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- Palladium-ceria (Pd-CeO2) catalysts are crucial for the water-gas-shift (WGS) reaction.
- Improving catalyst stability under reaction conditions is a key challenge.
Purpose of the Study:
- To investigate if embedding palladium (Pd) nanoparticles within ceria (CeO2) enhances catalyst stability for the water-gas-shift (WGS) reaction.
- To compare different preparation methods for Pd-CeO2 catalysts.
Main Methods:
- Preparation of Pd-CeO2 catalysts via co-precipitation (Pd@CeO2-CP), microemulsion (Pd@CeO2-ME), and impregnation (Pd/CeO2-IMP).
- Testing catalyst activity and stability using the WGS reaction at 250°C and 400°C.
- Physical characterization of the prepared catalysts.
Main Results:
- Pd@CeO2-CP and Pd/CeO2-IMP showed similar initial WGS rates at 250°C, indicating accessible Pd.
- Pd@CeO2-CP demonstrated better WGS stability than Pd/CeO2-IMP, but activity decreased at 400°C.
- Pd@CeO2-ME, despite low surface area and Pd accessibility, exhibited good WGS stability due to effective Pd encapsulation limiting sintering.
Conclusions:
- Encapsulating Pd nanoparticles within CeO2 can significantly improve catalyst stability for the WGS reaction.
- The microemulsion method (Pd@CeO2-ME) offers a promising route to stable Pd-CeO2 catalysts by limiting metal sintering.
- Catalyst design strategies should consider the trade-off between Pd accessibility and sintering resistance for high-temperature applications.
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