Journal
CATALYSIS TODAY
Volume 183, Issue 1, Pages 124-129Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2011.08.046
Keywords
Metallic nanoparticles; Magnetic support; Impregnation; Hydrogenation; Recycling
Funding
- Region Bretagne
- Universite Europeenne de Bretagne
- international cooperation programs PICS Brazil-France [490678/2008-4, 3637/2007-2010]
- CAPES-COFECUB [965/09, Ph695/10]
- CNPq
- FAPESP
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Wet impregnation of pre-synthesized surfactant-stabilized aqueous rhodium (0) colloidal suspension on silica was employed in order to prepare supported Rh-0 nanoparticles of well-defined composition, morphology and size. A magnetic core-shell support of silica (Fe(3)O4@SiO2) was used to increase the handling properties of the obtained nanoheterogeneous catalyst. The nanocomposite catalyst Fe3O4@SiO2-Rh-0 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(-1). The catalyst was characterized by various transmission electron microscopy techniques showing well-dispersed rhodium nanoparticles (similar to 3 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 Rh-0 colloidal suspension and various silica-supported Rh-0 nanoparticles. Finally, the composite catalyst could be reused in several runs after magnetic separation. (C) 2011 Elsevier B. V. All rights reserved.
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