A high-surface area (572 m² g^–1) dendritic mesoporous silica (KCC-1) was synthesized successfully and used as a support to confine Pt–Ni bimetallic nanoparticles (NPs). It is revealed that the Pt–Ni NPs are highly dispersed with an ultra-small size of 1.0 nm, and the large specific surface area as well as the abundant mesoporous structure of dendritic KCC-1 can effectively promote the dispersion and the thermal stability of Pt–Ni nanoparticles, thus significantly improving the CO oxidation activity. Compared with monometallic 1% Pt/KCC-1 and 1% Ni/KCC-1 catalysts, the combination of Pt and Ni together with a suitable ratio can further enhance the activity of the catalyst due to the synergetic effect between Pt and Ni. Over the 1% Pt₇Ni₃/KCC-1, the optimal catalyst in this study, 100% CO conversion was achieved at 100 °C. The incorporation of Ni into Pt leads to a reduction in the amount of noble metal required while simultaneously enhancing catalytic activity. This study offers a pathway for designing CO oxidation catalysts with low precious metal loading, yet exhibiting superior catalytic activity.

中文翻译：

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限制在树枝状介孔二氧化硅中的超小 Pt-Ni 双金属纳米粒子具有显着的 CO 催化氧化性能

成功合成了高表面积 (572 m ² g ^–1 ) 树枝状介孔二氧化硅 (KCC-1)，并将其用作限制 Pt-Ni 双金属纳米粒子 (NPs) 的载体。结果表明，Pt-Ni NPs 高度分散，具有 1.0 nm 的超小尺寸，树枝状 KCC-1 的大比表面积和丰富的介孔结构可以有效促进分散和热稳定性Pt-Ni 纳米粒子，从而显着提高 CO 氧化活性。与单金属1% Pt/KCC-1和1% Ni/KCC-1催化剂相比，Pt和Ni以合适的比例组合，由于Pt和Ni之间的协同作用，可以进一步提高催化剂的活性。1%以上 Pt ₇ Ni ₃/KCC-1，本研究中的最佳催化剂，在 100 °C 下实现 100% CO 转化。将 Ni 掺入 Pt 可减少所需贵金属的用量，同时提高催化活性。该研究为设计低贵金属负载但表现出优异催化活性的 CO 氧化催化剂提供了途径。