期刊
FRONTIERS IN CHEMISTRY
卷 10, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2022.836597
关键词
mechanochemical synthesis; bottom-up approach; ball-milling; bimetallic nanoparticle; nanoalloys; nanocatalysis; galvanic replacement reaction; nitrobenzene reduction
资金
- FAPESP [2020/14955-6, 2021/12899-4, 2015/26308-7, 2018/16219-5]
- CAPES [88882.328241/2019-01]
Silver-gold nanoalloys were synthesized using mechanochemical synthesis, without the use of any stabilizing agent. These nanoalloys exhibited enhanced catalytic activity in the hydrogenation of 2-nitroaniline. This method allows for the direct synthesis of nanoparticles in the solid-state with clean surfaces and available catalytic sites.
Silver-gold nanoalloys were prepared from their metal salts precursors through bottom-up mechanochemical synthesis, using one-pot or galvanic replacement reaction strategies. The nanostructures were prepared over amorphous SiO2 as an inert supporting material, facilitating their stabilization without the use of any stabilizing agent. The nanomaterials were extensively characterized, confirming the formation of the bimetallic nanostructures. The nanoalloys were tested as catalysts in the hydrogenation of 2-nitroaniline and exhibited up to 4-fold the rate constant and up to 37% increased conversion compared to the respective single metal nanoparticles. Our approach is advantageous to produce nanoparticles with clean surfaces with available catalytic sites, directly in the solid-state and in an environmentally friendly manner.
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