title: A Highly Stable and Magnetically Recyclable Nanocatalyst System: Mesoporous Silica Spheres Embedded with FeCo/Graphitic Shell Magnetic Nanoparticles and Pt Nanocatalysts.
abstract: We have developed a highly stable and magnetically recyclable nanocatalyst system for alkene hydrogenation. The materials are composed of mesoporous silica spheres (MSS) embedded with FeCo/graphitic shell (FeCo/GC) magnetic nanoparticles and Pt nanocatalysts (Pt-FeCo/GC@MSS). The Pt-FeCo/GC@MSS have superparamagnetism at room temperature and show type IV isotherm typical for mesoporous silica, thereby ensuring a large enough inner space (surface area of 235.3 m(2)  g(-1), pore volume of 0.165 cm(3)  g(-1), and pore diameter of 2.8 nm) to undergo catalytic reactions. We have shown that the Pt-FeCo/GC@MSS system readily converts cyclohexene into cyclohexane, which is the only product isolated and Pt-FeCo/GC@MSS can be seperated very quickly by an external magnetic field after the catalytic reaction is finished. We have demonstrated that the recycled Pt-FeCo/GC@MSS can be reused further for the same hydrogenation reaction at least four times without loss in the initial catalytic activity.
authors: Department of Chemistry, Sogang University, Seoul, 121-742, Korea.
authors: Da Jeong
authors: DJ
authors: Kim
authors: Department of Chemistry, Sogang University, Seoul, 121-742, Korea.
authors: Yan
authors: Y
authors: Li
authors: Department of Chemistry, Sogang University, Seoul, 121-742, Korea.
authors: Yun Jin
authors: YJ
authors: Kim
authors: Department of Chemistry, Sogang University, Seoul, 121-742, Korea.
authors: Nam Hwi
authors: NH
authors: Hur
authors: Department of Chemistry, Sogang University, Seoul, 121-742, Korea. wsseo@sogang.ac.kr.
authors: Won Seok
authors: WS
authors: Seo
keywords: graphitic shell; hydrogenation; magnetic nanoparticles; mesoporous materials; nanocatalysts