Preparação e caracterização de catalisadores de ferritas Ni-Zn via reação de combustão usando

Abstract

The interest in water gas shift reaction has increased significantly in recent years due to considerable production of purified hydrogen for fuel cell power systems. The of this work is to evaluate the influence of fuels, such as, monohydrated citric acid, aniline, carbohidrazina, oxalic acid dihydrazine, glycine and urea in the preparation of catalysts based on the ferrites by reaction of combustion, also to evaluate the performance of these catalysts in the process of water gas shift reaction (WGRS).The powders obtained by combustion reaction were submitted to analysis of X-ray diffraction, textural analysis by adsorption of N2 and MEV. The results show the presence of the major phase of Ni0,5Zn0,5Fe2O3 for all compositions studied. The composition F-M-G presented a shorter extension of the peaks, consequently larger crystallites (41nm). The powder obtained with urea (F-M-U) showed the highest value of surface area (66,94m2/g), as a result of smaller particle diameter.