Tailoring Metal–Oxide Interfaces via Selectively CeO<sub>2</sub>-Decorated Pd Nanocatalysts with Enhanced Catalytic Performance
Metal–oxide interfaces play a prominent role in heterogeneous catalysis. Tailoring the metal–oxide interfaces effectively enhance the catalytic activities and thermal stability of noble metal catalysts. In this work, polyvinyl alcohol-protected reduction and L-arginine induction methods are adopted...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/15/3/197 |
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| Summary: | Metal–oxide interfaces play a prominent role in heterogeneous catalysis. Tailoring the metal–oxide interfaces effectively enhance the catalytic activities and thermal stability of noble metal catalysts. In this work, polyvinyl alcohol-protected reduction and L-arginine induction methods are adopted to prepare Pd catalysts (Pd/Al<sub>2</sub>O<sub>3</sub>-xCeO<sub>2</sub>) that are selectively decorated by CeO<sub>2</sub>, which form core–shell-like structures and generate more Pd-CeO<sub>2</sub> interfacial sites, so that the three-way catalytic activity of Pd/Al<sub>2</sub>O<sub>3</sub>-xCeO<sub>2</sub> catalysts is obviously significantly enhanced due to more adsorption oxygen at the interface of Pd-CeO<sub>2</sub> and good low-temperature reducibility. At the moment, the Pd/Al<sub>2</sub>O<sub>3</sub>-xCeO<sub>2</sub> catalysts exhibit excellent thermal stability after being calcined at 900 °C for 5 h, owing to the Pd species being highly redispersed on CeO<sub>2</sub> and part of the Pd species being incorporated into the lattice of CeO<sub>2</sub>. This is a major reason for the Pd/Al<sub>2</sub>O<sub>3</sub>-xCeO<sub>2</sub> catalysts to maintain high catalytic activity after aging at high temperatures. It is concluded that the metal–oxide interfaces and the interaction between Pd NPs and CeO<sub>2</sub> are responsible for the excellent catalytic performance and stability of Pd/Al<sub>2</sub>O<sub>3</sub>-xCeO<sub>2</sub> catalysts in three-way reactions. |
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| ISSN: | 2079-4991 |