Nickel-Fe3O4 Magnetic Nanoparticles Supported on Multiwalled Carbon Nanotubes: Effective Catalyst in Suzuki Cross Coupling Reactions
Nickel-Fe3O4 Magnetic Nanoparticles Supported on Multiwalled Carbon Nanotubes: Effective Catalyst in Suzuki Cross Coupling Reactions
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DOI：
10.3390/catal11040495
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发表时间：
2021-04-01
期刊：
影响因子：
3.9
通讯作者：
Siamaki, Ali R.
中科院分区：
文献类型：
--
作者：
Folsom, Sojeong K.;Ivey, Destiny J.;Siamaki, Ali R.
采用球磨机混合机对镍盐、Fe3O4和MWCNTs进行机械研磨，合成了负载在多壁碳纳米管（Ni-Fe3O4/MWCNTs）上的Ni-Fe3O4纳米颗粒。该制备方法允许在室温下批量生产Ni-Fe3O4纳米颗粒，而不需要任何溶剂或化学试剂。该方法制备的纳米颗粒粒径在5 ~ 8 nm之间，镍纳米颗粒均匀分布在多壁碳纳米管表面。Ni-Fe3O4/MWCNTs对功能化芳基卤化物和苯硼酸的Suzuki交叉偶联反应具有显著的催化活性，在120℃的Monowave 50常规加热反应器中，在极短的15分钟反应时间内，具有优异的周转率和周转率（例如76,000 h(-1)）。该催化剂具有空气稳定性，由于其磁性，可回收性且不损失活性，因此易于从反应混合物中去除，并且性能明显优于其他知名的商用镍催化剂。采用x射线衍射（XRD）、透射电子显微镜（TEM）和x射线光电子能谱（XPS）等多种光谱技术对Ni-Fe3O4/MWCNTs纳米颗粒进行了表征。由于镍与其他更昂贵的过渡金属（包括在交叉偶联催化中最广泛使用的钯）具有相似的性能，因此本研究展示了一种基于镍纳米颗粒的低成本、空气湿度稳定和高效的交叉偶联反应替代催化剂。
Nickel-Fe3O4 nanoparticles supported on multi-walled carbon nanotubes (Ni-Fe3O4/MWCNTs) were synthesized by mechanical grinding of a sample of nickel salt, Fe3O4 and MWCNTs using a ball-mill mixer. The preparation method allows for bulk production of Ni-Fe3O4 nanoparticles at room temperature without the necessity of any solvent or chemical reagent. The nanoparticles prepared by this method exhibit small particles size of 5-8 nm with uniform dispersion of nickel nanoparticles on the surface of multi-walled carbon nanotubes. The Ni-Fe3O4/MWCNTs demonstrated remarkable catalytic activity for Suzuki cross coupling reactions of functionalized aryl halides and phenylboronic acids with excellent turnover number and turnover frequency (e.g., 76,000 h(-1)) using Monowave 50 conventional heating reactor at 120 degrees C within a very short reaction time of 15 min. The catalyst is air-stable and exhibits easy removal from the reaction mixture due to its magnetic properties, recyclability with no loss of activity, and significantly better performance than the other well-known commercial nickel catalyst. The Ni-Fe3O4/MWCNTs nanoparticles were fully characterized by a variety of spectroscopic techniques including X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and X-ray Photoelectron Spectroscopy (XPS). Since nickel offers similar properties to other more expensive transition metals including the most widely used palladium counterpart in cross coupling catalysis, this work demonstrates a promising lower-cost, air-moisture stable and efficient alternative catalyst based on nickel nanoparticles for cross coupling reactions.