Cerium doped (5%) lanthanum cobaltites were synthesized in acid medium by using the sol-gel method. The obtained compounds were studied by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). After the synthesis process, the samples were calcined at temperatures of 800 and 900 °C, observing changes in structural and morphological properties of annealed samples. Additionally, tests of catalytic activity were performed in the degradation reaction of methyl-thionine chloride, wherein the synthesized material was used as catalyst.