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Reduction reactions applied for synthesizing different nano-structured materials

2013; Elsevier BV; Volume: 140; Issue: 1 Linguagem: Inglês

10.1016/j.matchemphys.2013.03.034

1879-3312

Eduardo de Albuquerque Brocchi, Rogério Navarro Correia de Siqueira, Marcelo Motta, Francisco José Moura, Ivan Guillermo Solórzano-Naranjo,

Nanomaterials for catalytic reactions

Different materials have been synthesized by alternative routes: nitrates thermal decomposition to prepare oxide or co-formed oxides and reduction by hydrogen or graphite to obtain mixed oxides, composites or alloys. These chemical-based synthesis routes are described and thermodynamics studies and kinetics data are presented to support its feasibility. In addition, selective reduction reactions have been applied to successfully produce metal/ceramic composites, and alloys. Structural characterization has been carried out by X-ray Diffraction and, more extensively, Transmission Electron Microscopy operating in conventional diffraction contrast (CTEM) and high-resolution mode (HRTEM), indicated the possibility of obtaining oxide and alloy crystals of sizes ranging between 20 and 40 nm.