Ultra-Small Pt-Ni Bimetallic Nanoparticles Confined in Dendritic Mesoporous Silica with Remarkable CO Catalytic Oxidation Performance

A high-surfacearea (572 m(2) g(-1)) dendriticmesoporous silica (KCC-1) was synthesized successfully and used asa support to confine Pt-Ni bimetallic nanoparticles (NPs).It is revealed that the Pt-Ni NPs are highly dispersed withan ultra-small size of 1.0 nm, and the large specific surface areaas well as the abundant mesoporous structure of dendritic KCC-1 caneffectively promote the dispersion and the thermal stability of Pt-Ninanoparticles, 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 furtherenhance the activity of the catalyst due to the synergetic effectbetween Pt and Ni. Over the 1% Pt7Ni3/KCC-1,the optimal catalyst in this study, 100% CO conversion was achievedat 100 degrees C. The incorporation of Ni into Pt leads to a reductionin the amount of noble metal required while simultaneously enhancingcatalytic activity. This study offers a pathway for designing CO oxidationcatalysts with low precious metal loading, yet exhibiting superiorcatalytic activity.