Reference : Synthesis of transition metal-doped carbon xerogels by cogelation
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/19802
Synthesis of transition metal-doped carbon xerogels by cogelation
English
Job, Nathalie mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Chimie physique appliquée > >]
Pirard, René [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Chimie physique appliquée > >]
Vertruyen, Bénédicte mailto [Université de Liège - ULg > Département de chimie (sciences) > Chimie inorganique structurale >]
Colomer, Jean-Francois [> > > >]
Marien, José mailto [Université de Liège - ULg > Département de chimie appliquée > Chimie générale et chimie physique >]
Pirard, Jean-Paul mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Chimie physique appliquée > >]
2007
Journal of Non-Crystalline Solids
Elsevier Science
353
24-25
2333-2345
Yes (verified by ORBi)
International
0022-3093
Amsterdam
The Netherlands
[en] carbon ; TEM/STEM ; nanoparticles ; sol gels (xerogels) ; X-ray diffraction ; transition metals
[en] The cogelation process, i.e. the co-polymerization of a metal complex with the gel precursors, was used for the synthesis of transition metal-doped resorcinol-formaldehyde gels. The aim of this process is to anchor the metal to the polymer so that the former does not sinter during the pyrolysis step leading to porous carbon. Cu-, Ni-, Pd- or Pt-loaded gels were prepared by this technique. After drying and pyrolysis, Pd and Pt were obtained as metal nanoparticles (2-5 nm in diameter) inserted in the carbon nodules, when the complexing agent and the synthesis conditions were well chosen. These small metal particles were inaccessible to reactive gases, probably due to carbon deposit at the metal surface during pyrolysis: CO almost did not chemisorb. Oxidation of the support or pyrolysis under reductive atmosphere was applied to the metal-doped gels and carbons in order to make the surface of the metal particles accessible, but these treatments develop the macropores only. The cogelation process is then suitable to prepare metal nanoparticles protected from the outside by encapsulation in the carbon matrix. (C) 2007 Elsevier B.V. All rights reserved.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
http://hdl.handle.net/2268/19802
also: http://hdl.handle.net/2268/5664
10.1016/j.jnoncrysol.2007.04.001

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