Estudo da síntese e caracterização de nanopartículas de cobre dispersas em matrizes mesoporosas de AI203.

Abstract

The mesoporous matrices are an important group of materials technology because its applications are many, such as in pigments, refractories, catalysts, and electronic ceramics. The AI2SO3 unit cell is able of hosting nanoparticles as divalent copper Cu2 + in solution. Furthermore, they are materials of much interest because of their properties such as high mechanical strength, high thermal stability, low temperature sintered, low surface acidity and high cation diffusion capacity. Due to such properties, it has utility as a high temperature ceramic coating or host optic array, for its catalytic properties can be used in reactions such as dehydration, hydrogenation, and synthesis of other products. Due to the high chemical homogeneity, the Pechini method - consists in dissolving the cation precursor in an aqueous solution of citric acid, it's an important strategy for synthesizing complex oxides - can be in the synthesis of nanoparticles, which in turn may be hosted in the cell unit of mesoporous matrices. In this method, an aqueous solution of citric acid to metal ions is polymerized ethylene glycol to form a polyester resin type. The metal ions are immobilized, and therefore the segregation of a particular metal during processing is considerably reduced. Thus, this method has a distinct advantage over most other methods, the production of very pure mixed oxides. For these reasons, in this study, we aimed to the synthesis and characterization of copper nanoparticles dispersed in mesoporous matrices A1203, obtained by the method of polymeric precursor Pechini. With the analysis made in the material obtained was observed in high quality crystallographic structure with nanostructural properties, being a strong indication of a promising material with catalytic properties.