This work reports the synthesis of multiwall carbon nanotubes (MWCNTs) by the catalytic decomposition of ethanol using the perovskite-type oxide LaNiO 3 as catalyst precursor. The carbon nanotubes were characterized by transmission electronic microscopy (TEM), scanning electronic microscopy (SEM) and thermogravimetric analysis (TGA). TEM micrographs show that the carbon nanotubes were multi-walled with inner diameters ranging from 3 nm to 12 nm and outer diameters up to 42 nm. The yield of CNT and H 2 were 3.5 g CNT ·(g cat ·h) -1 and 39 L H2 ·(g·h) -1 respectively at 700 °C. TGA data show that nanotube carbon purity was about 95 % by weight and the