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Highly Stable and Magnetically Recyclable Mesoporous Silica Spheres Embedded with FeCo/Graphitic Shell Nanocrystals for Supported Catalysts

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journal contribution
posted on 22.02.2016, 10:44 by Yan Li, Yun Jin Kim, A. Young Kim, Kyujoon Lee, Myung Hwa Jung, Nam Hwi Hur, Kang Hyun Park, Won Seok Seo
We have synthesized highly stable and magnetically recyclable mesoporous silica spheres embedded with FeCo-graphitic carbon shell nanocrystals (FeCo/GC@MSS) by a simple one-step chemical vapor deposition (CVD) method. Solid core-mesoporous shell silica spheres with an average diameter of ∼400 nm are used as supports not only for the synthesis of the FeCo/GC nanocrystals but also for catalysts after the synthesis of the FeCo/GC@MSS. The FeCo/GC nanocrystals in the mesoporous silica spheres exhibit superparamagnetism with ultrahigh saturation magnetization up to 215 e.m.u./metal g at room temperature. The FeCo/GC@MSS is chemically stable against acid etching and oxidation, which enable the FeCo/GC@MSS to be used as a support for an acid catalyst, phosphomolybdic acid (PMA). We have shown that PMA-loaded FeCo/GC@MSS works as an excellent recyclable reagent system that catalyzes propargylation of 1,3-diphenyl-2-propyn-1-ol with phenol.