Metal sintering poses significant challenges for developing reliable catalytic systems toward high-temperature reactions, particularly those based on metal clusters with sizes below 3 nm. In this work, electrospun dual-oxide fibril-in-tubes consisting of CeO₂ and Al₂O₃ are rationally designed in an all-in-one manner, to stabilize 2.3 nm Pt clusters with a Tammann temperature (sintering onset temperature) lower than 250 °C. The abundant pores and channels effectively stabilize the Pt clusters physically, while the strong support, CeO₂, with high adhesion, pins Pt clusters firmly, and the adjacent weak support, Al₂O₃, with low adhesion, provides energy barriers to prevent the clusters and emitted Pt atom(s) from moving across the support. Therefore, the ultra-close 2.3 nm Pt clusters, featuring an average nearest neighboring distance of only 2.1 nm, were carefully stabilized against sintering at temperatures exceeding 750 °C, even in oxidative and steam-containing environments. In addition, this catalytic system can efficiently and durably serve in diesel combustion, a high-temperature exothermic reaction, showing no activity decline after 5 cycles. This work provides a comprehensive understanding of sinter-resistant catalytic systems, and presents new insights for the development of advanced nanocatalysts.

中文翻译：

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稳定一体化 CeO2/Al2O3 原纤维管上的超紧密 Pt 团簇以防止烧结


金属烧结对开发可靠的高温反应催化系统提出了重大挑战，特别是那些基于尺寸低于 3 nm 的金属簇的催化系统。在这项工作中，以一体化的方式合理设计了由CeO ₂和Al ₂ O ₃组成的电纺双氧化物原纤维管，以较低的塔曼温度（烧结起始温度）稳定2.3 nm的Pt簇。超过250°C。丰富的孔隙和通道有效地物理稳定了Pt团簇，而具有高粘附力的强支撑体CeO ₂牢固地钉住了Pt团簇，而相邻的弱支撑体Al ₂ O ₃具有低粘附力，提供了能量屏障以防止Pt团簇的发生。簇和发射的 Pt 原子在支撑物上移动。因此，超近的 2.3 nm Pt 团簇的平均最近邻距离仅为 2.1 nm，即使在氧化和含蒸汽的环境中，也能在超过 750 °C 的温度下保持稳定的烧结状态。此外，该催化系统可以高效、持久地用于柴油燃烧这一高温放热反应，5个循环后活性没有下降。这项工作提供了对抗烧结催化系统的全面了解，并为先进纳米催化剂的开发提供了新的见解。