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• W2128299651 abstract "A well-defined core–shell nanocomposite with magnetic iron oxide nanoparticles coated by a hierarchically structured silica shell has been synthesized through a sol–gel process and pseudomorphic transformation. The prepared materials were characterized by means of transmission electron microscopy, small and wide angle X-ray diffraction, Mössbauer spectroscopy and N2 physical adsorption–desorption. It has been shown that the core–shell nanocomposite possesses a magnetic core in the form of Fe3O4 or γ-Fe2O3 and a unique hierarchically structured silica shell consisting of an inner nonporous shell and outer shell with hierarchical pores. As a result, this nanocomposite exhibits high stability (acid resistance) and a large surface area (447 m2 g−1), which will be especially suitable for use as catalyst supports. To demonstrate this point, a functional catalyst consisting of small Pt nanoparticles well-dispersed on the porous surface of the magnetic core–shell nanocomposite was fabricated. In the hydrogenation of nitrobenzene and 2-nitrochlorobenzene to the corresponding aniline compounds, the hierarchically porous catalyst showed superior performances to its counterpart with a monomodal porous structure. In addition, the used catalyst could be separated conveniently from the reaction system with an external magnetic field. Subsequent recycling tests further confirmed the outstanding reusability and regeneration ability of the composite catalyst." @default.
• W2128299651 created "2016-06-24" @default.
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• W2128299651 date "2014-01-01" @default.
• W2128299651 modified "2023-10-16" @default.
• W2128299651 title "Magnetic iron oxide nanoparticles coated by hierarchically structured silica: a highly stable nanocomposite system and ideal catalyst support" @default.
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• W2128299651 doi "https://doi.org/10.1039/c4ta00258j" @default.
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