La2O3 负载的 Pt 纳米颗粒的再生在 La2O3 载体上提供高负载的热稳定 Pt 单原子：对催化的影响,ACS Applied Nano Materials

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La2O3 负载的 Pt 纳米颗粒的再生在 La2O3 载体上提供高负载的热稳定 Pt 单原子：对催化的影响
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-02-16 , DOI: 10.1021/acsanm.1c04363
Yanxia Gao _{1,

2,

3,

4} , Dongxu Yan _{2,

3,

4} , Chunqi Wang _{1,

2,

3,

4} , Jing Chen _{4,

5,

6} , Jin Chen _{2,

3,

4} , Hongpeng Jia _{2,

3,

4}

Affiliation

提高单原子催化剂 (SACs) 贵金属的负载量和稳定性对其工业催化应用极为重要，但仍面临巨大挑战，尤其是在金属氧化物负载的 SACs 用于高温催化反应方面，例如如 CH ₄氧化。_{在此，我们利用从 La 2} O ₂ CO ₃再生La ₂ O ₃过程中逸出的碳来立即捕获和限制从 Pt 纳米粒子 (NPs) 释放的 PtO _{2物质，并在 La}₂ O ₃上获得高负载的 Pt 单原子, 即使在 800 °C 下在空气中煅烧 5 天后也非常稳定。此外，在原位高温反应过程中还可以实现Pt NPs的原子化和Pt原子的稳定化，有效提高CH ₄的催化氧化活性。得到的SACs可以作为单原子活性组分前驱体负载在氧化铈等金属氧化物的表面，在低Pt含量的情况下可以显着提高CH _{4的氧化性能。}在实现 Pt SAC 负载后，商业 CeO ₂和 CeO _{2上的 CH}₄转化使用沉淀法制备的样品在 700 °C 时分别增加了 40% 和 70%。这种简便且经济的策略简化了热稳定 SACs 的可控制备，并进一步拓宽了 SACs 在各种条件下的实际应用。

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Regeneration of La2O3-Supported Pt Nanoparticles Giving High Loadings of Thermally Stable Pt Single Atoms on La2O3 Supports: Implications for Catalysis

Improving the loading content and stability of a noble metal for single-atom catalysts (SACs) is extremely important for its industrial catalytic applications, but there are still formidable challenges, especially on metal oxide-supported SACs for a high-temperature catalytic reaction, such as CH₄ oxidation. Herein, we utilize carbon escaping during La₂O₃ regeneration from La₂O₂CO₃ to immediately capture and confine PtO₂ species released from Pt nanoparticles (NPs) and obtain high-loading Pt single atoms on La₂O₃, which are extremely stable even after calcination at 800 °C for 5 days in air. Moreover, the atomization of Pt NPs and stabilization of Pt atoms can also be fulfilled during the in situ high-temperature reaction process effectively improving catalytic oxidation activity of CH₄. The obtained SACs can serve as a single-atom active component precursor for loading on the surface of metal oxides such as ceria, which can significantly improve CH₄ oxidation performance with a low Pt content. After achieving the Pt SAC loading, CH₄ conversions on commercial CeO₂ and CeO₂ prepared using the precipitation method are increased by 40 and 70% at 700 °C, respectively. This facile and economic strategy simplifies the controllable preparation of thermally stable SACs and further broadens the practical application of SACs under various conditions.

更新日期：2022-02-16

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