Preparação de catalisadores Ni/a-AI2O3 dopados com Zn, Fe e Ce para aplicação em processos de reforma de gás natural.

Abstract

The development of the materials, mainly in the last decade, has produced a great variety of porous solid and structured that has been finding important applications in the catalysis in petroleum industry. Due to the imminence of lack of the petroleum in a neatfuture, there is a great growth for new materials development for the application in catalytic systems to natural gas conversion. The heterogeneous catalysis a process that occurs in the surface of the catalytic support and the advent of the technology for the production of nanosize powders, with high surface area became o f crucial importance for this area. Based on this context, this work has for aim the development of the Ni/A^Os catalysts type modified with Fe, Zn and Ce oxides, for application in the steam reforming process of the natural gas. The catalysts supports were obtained through a combustion reaction synthesis method, which is effective to produce nanosize particles, but still little studied for application in catalysts. The synthesis of these catalysts supports has done by two distinct procedures aiming to evaluate the influence of the same on the particles characteristics of the obtained supports. All the studied catalysts supports in this work were characterized by: diffraction of X-ray, N2 adsorption by the BET method, agglomerated size distribution, scanning electron microscope and transmission electron microscope. According to the results, only the catalytic supports of (X-AI2O3 doped with iron and zinc, in the concentrations of 0.05 and 0.01 moles, respectively, give structure with unique and crystalline (1--AI2O3 phase. The doped supports with cerium and minimum concentration of 0.001 moles shown the presence of second phase besides the 01-AI2O3 phase . After the impregnation process with nickel, all the catalysts were characterized by N2 adsorption by BET method and physical characteristic of the material. The results from catalysts tests showed that all developed catalysts in this work were efficient in the methane in syngas conversion.