[en] Full text: The interest in the application of nanoparticles has been growing in recent years mainly due to its unique physical and chemical properties. The electrospinning technique has been recognized as a versatile method for producing nanostructured fibers. The use of 3-way-catalysts is an method to minimize greenhouse gas emissions. The use of CeO₂ is usually related to its ability to store oxygen and release oxygen. In this work, fibers of CeO₂ doped with Cu were obtained using the electrospinning technique. A solution containing cerium nitrate, determined amounts of copper nitrate and ethanol was prepared. This solution was mixed with a solution containing 15wt% of polyvinyl butyral. In a typical electrospinning process, this solution was placed in a syringe with 10G needle, connected to a high voltage source (15kV). The obtained fibers were heat treated at 600°C for 2h in a electrical furnace. The fibers were characterized morphologically by scanning electron microscopy (SEM) and transmission microscopy (TEM); they had their specific surface area determined by BET method; they were subjected to thermogravimetric analysis (TGA) and were analyzed by X-ray diffraction. To measure the catalytic activity it was used a muffle furnace with a quartz tube mounted vertically, heated up to 600°C. A flow of methane of 0.1L/min and synthetic air of 0.9L/min were used. The amount of gases CxHy, O₂ , CO, CO₂ , NO, NOx were measured using a portable gas analyzer. SEM and TEM images show fibers with approximately 360nm in diameter. The specific surface area of the heat treated fibers was about 49m² /g. A catalytic test without catalyst promotes the formation of NOx up to 4 ppm. No combustion occur at this condition. In the presence of the catalyst, the fibers containing pure CeO₂ promote a CH₄ conversion of 85% and the formation of 2ppm of NOx. The best results were achieved using CeO₂ + 0.5wt%Cu where CH₄ conversion was 100% and no NOx was detected. (author)