Moving from surfactant-stabilized aqueous rhodium (0) colloidal suspension to heterogeneous magnetite-supported rhodium nanocatalysts: Synthesis, characterization and catalytic performance in hydrogenation reactions

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• 作者：Carl-Hugo Pé ; lisson^a ; ^b ; Lucas L.R. Vono^c ; Claudie Hubert^a ; ^b ; Audrey Denicourt-Nowicki^a ; ^b ; Liane M. Rossi^c ; Alain Roucoux^a ; ^b ; ^{alain.roucoux@ensc-rennes.fr}
• 关键词：Metallic nanoparticles ; Magnetic support ; Impregnation ; Hydrogenation ; Recycling
• 刊名：Catalysis Today
• 出版年：2012
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：20 March, 2012
• 卷：183
• 期：1
• 页码：124-129
• 文件大小：610 K

摘要

Wet impregnation of pre-synthesized surfactant-stabilized aqueous rhodium (0) colloidal suspension on silica was employed in order to prepare supported Rh⁰ nanoparticles of well-defined composition, morphology and size. A magnetic core-shell support of silica (Fe₃O₄@SiO₂) was used to increase the handling properties of the obtained nanoheterogeneous catalyst. The nanocomposite catalyst Fe₃O₄@SiO₂-Rh⁰ NPs was highly active in the solventless hydrogenation of model olefins and aromatic substrates under mild conditions with turnover frequencies up to 143,000 h^鈭?. The catalyst was characterized by various transmission electron microscopy techniques showing well-dispersed rhodium nanoparticles (鈭? nm) mainly located at the periphery of the silica coating. The heterogeneous magnetite-supported nanocatalyst was investigated in the hydrogenation of cyclohexene and compared to the previous surfactant-stabilized aqueous Rh⁰ colloidal suspension and various silica-supported Rh⁰ nanoparticles. Finally, the composite catalyst could be reused in several runs after magnetic separation.