Síntese e estudo microestrutural de perovskita do tipo La 0,8Ca0,2MO3 (M = Co ou Mn) com gelatina como precursor orgânico para aplicação em catálise automotiva

Abstract

Materials with perovskite structure are potential catalysts to prevent emission of pollutants into the environment. Various methods have been proposed for the synthesis of these materials, to produce homogeneous materials with nanoscale particle size. In this work, lanthanum manganate and lanthanum cobaltate compounds with partial substitution of calcium were synthesized using gelatin as a precursor agent, aiming its use as automotive catalysts. This synthesis method was used because it allows the synthesis of crystalline phases with homogeneous and porous powders. The powders obtained at 300 °C/4 h were calcined at 700 and 900 °C/4 h and were characterized by thermogravimetric analysis, X-ray diffraction and scanning electron microscopy. The obtained perovskites were monophasic, nanometric, porous and with suitable properties for application in automotive catalysis.