A freestanding SiO2 ultrathin membrane with NiCu nanoparticles embedded on its double surfaces for catalyzing nitro-amination
A freestanding SiO2 ultrathin membrane with NiCu nanoparticles embedded on its double surfaces for catalyzing nitro-amination
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双面嵌入 NiCu 纳米粒子的独立式 SiO2 超薄膜，用于催化硝基胺化
DOI：
10.1039/c8dt00859k
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发表时间：
2018-05-28
影响因子：
4
通讯作者：
Wu, Qingsheng
中科院分区：
文献类型：
--
作者：
Gu, Chen;Wu, Dandan;Wu, Qingsheng
在本论文中，通过在氢气中原位还原NiCuSiO_3-氢氧化物前驱体，在自支撑的SiO_2超薄膜的双表面同步组装了NiCu纳米颗粒(类似于6 nm)，从而探索了一种新的二维超薄纳米结构。这些二维超薄纳米结构的NiCu-SiO_2具有很高的比表面积和极高的形貌稳定性，可以很好地嵌入原位形成的NICU纳米粒子，从而获得优异的催化循环稳定性。将NiCu-SiO_2纳米复合材料用于催化4-硝基苯酚的胺化反应，反应选择性高达99%，循环20次后没有明显的性能衰退。此外，所设计的纳米催化剂在其他硝胺化反应中也有广泛的应用。
Herein, a new two-dimensional (2D) ultrathin-nanostructure of NiCu-SiO2 has been explored through synchronously assembling NiCu nanoparticles (similar to 6 nm) on the double surfaces of the freestanding SiO2 ultrathin membrane by the in situ reduction of the NiCuSiO3 - hydroxide precursor under H-2. These 2D ultrathin-nanostructures of NiCu-SiO2 have high surface area and extremely high stability of morphology and thus can well embed the in situ formed NiCu NPs to achieve excellent catalytic cycling stability. When the NiCu-SiO2 nanocomposite is used to catalyze the amination reaction of 4-nitrophenol, the reaction selectivity is as high as 99%, and no obvious performance decay appears after 20 cycles. Moreover, the designed nanocatalyst has wide applications in other nitro-amination reactions.