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Synthesis of Mesoporous Silica with Embedded Nickel Nanoparticles for Catalyst Applications

2002; American Scientific Publishers; Volume: 2; Issue: 1 Linguagem: Inglês

10.1166/jnn.2002.070

1533-4899

E. R. Leite, Neftalí Lênin Villarreal Carreño, E. Longo, Antoninho Valentini, Luiz F. D. Probst,

Catalysis and Oxidation Reactions

Here we describe a new route for the synthesis of nanometric Ni particles embedded in a mesoporous silica material with excellent potential for catalytic applications. Mesoporous silica with a surface area in the range of 202-280 m2/g, with narrow pore size distribution and Ni nanoparticles (particles in the range of 3-41 nm) were obtained in a direct process. A different approach was adopted to process such a nanocomposite. This new approach is based on the formation of a polymer with the silicon oxianion and nickel cation chelated to the macromolecule structure and on the control of the pyrolysis step. The CO/CO2 atmosphere resulting from the pyrolysis of the organic material promotes the reduction of the Ni citrate.