Pan Xiaoyang, Zheng Jing, Zhang Liuxian, Yi Zhiguo
College of Chemistry and Materials , Quanzhou Normal University , Quanzhou 362000 , China.
Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of Nanomaterials , Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou 350002 , China.
Inorg Chem. 2019 Aug 19;58(16):11164-11171. doi: 10.1021/acs.inorgchem.9b01759. Epub 2019 Aug 5.
Catalysis using gold (Au) nanoparticles has become an important field of chemistry. However, activity loss caused by aggregation or leaching of Au nanoparticles greatly limits their application in catalytic reaction. Herein, we report a facile and green synthesis of a core-shell Au@SnO nanocomposite, exhibiting excellent activity toward selective nitroaromatics reduction under mild conditions. The core-shell Au@SnO nanocomposite (Au size = ∼50 nm; shell thickness = ca. 16 nm) is conceived and validated by a direct redox reaction between HAuCl and SnF. Optimization of the core size, shell thickness, and dispersion of Au@SnO has been introduced by an alkaline surface supported by negatively charged metal oxide NaTiO. The as-obtained Au-Sn-NaTiO catalyst with much smaller Au cores (ca. 5 nm) and thinner SnO nondensed shells (ca. 4 nm) exhibits highly improved catalytic activities for nitro reduction compared to most of the known Au-based catalysts. Moreover, the core-shell Au@SnO structure inhibits the leaching and agglomeration of Au nanoparticles and thus leads to superior catalytic durability.
使用金（Au）纳米颗粒的催化已成为化学的一个重要领域。然而，Au纳米颗粒的聚集或浸出导致的活性损失极大地限制了它们在催化反应中的应用。在此，我们报道了一种简便绿色的核壳Au@SnO纳米复合材料的合成方法，该复合材料在温和条件下对选择性硝基芳烃还原表现出优异的活性。核壳Au@SnO纳米复合材料（Au尺寸 = ∼50 nm；壳厚度 = 约16 nm）是通过HAuCl与SnF之间的直接氧化还原反应构思并验证的。通过由带负电荷的金属氧化物NaTiO支撑的碱性表面引入了对Au@SnO的核尺寸、壳厚度和分散性的优化。与大多数已知的金基催化剂相比，所获得的具有小得多的Au核（约5 nm）和更薄的非致密SnO壳（约4 nm）的Au-Sn-NaTiO催化剂对硝基还原表现出高度提高的催化活性。此外，核壳Au@SnO结构抑制了Au纳米颗粒的浸出和团聚，从而导致优异的催化耐久性。
