Zhang Weihe, Chen Xuecheng, Tang Tao, Mijowska Ewa
Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
Nanoscale. 2014 Nov 7;6(21):12884-9. doi: 10.1039/c4nr04245j.
Magnetic nanoreactors based on Pd nanoparticles supported on magnetic carbon nanotubes that are coated by a mesoporous silica layer, (Fe3O4-CNT-Pd)@m-SiO2, have been selectively synthesized by facile steps. The prepared system exhibits high catalytic efficiency in Suzuki-coupling reactions because of the Pd nanoparticles supported on carbon nanotubes (CNT-Pd). Most importantly, induced magnetic properties make the separation of the catalyst easy from the reaction media, which can be re-used several times with significant activity. Moreover, the existence of a mesoporous silica layer makes the Pd catalyst very stable and does not allow the Pd nanoparticles to get detached from the CNT supports. The above-mentioned observations make the obtained catalyst a great candidate for future applications.
基于负载在磁性碳纳米管上的钯纳米颗粒且被介孔二氧化硅层包覆的磁性纳米反应器（Fe3O4-CNT-Pd）@m-SiO2，已通过简便步骤选择性合成。所制备的体系在铃木耦合反应中表现出高催化效率，这归因于负载在碳纳米管上的钯纳米颗粒（CNT-Pd）。最重要的是，诱导磁性使得催化剂易于从反应介质中分离，并且可以多次重复使用且具有显著活性。此外，介孔二氧化硅层的存在使钯催化剂非常稳定，且不允许钯纳米颗粒从碳纳米管载体上脱落。上述观察结果使所获得的催化剂成为未来应用的极佳候选者。
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