The purpose of this paper is to present the third stage of regeneration for ecat: a deactivated or equilibrium catalysts which are waste from fluidized catalytic cracking (FCC) units. This stage is going to compose a complete circular economy (CE) model and increases the life cycle catalyst. The third stage of regeneration, after the adsorption process for sulfur and nitrogen compounds from real diesel, was assessment using as solvents: acetone (propanone), ethanol, benzene and toluene. For sulphur and nitrogen compounds, ethanol achieved the best performance. The variations of physical and chemical properties of regenerated ecat's in the cycles of adsorption and desorption were evaluated using x-ray diffraction, x-ray fluorescence, nitrogen adsorption-desorption, thermogravimetric and differential thermal analysis, scanning electron microscopy and Fourier-transform infrared spectroscopy. The recovery rate over four cycles is superior for sulfur compounds. After all cycles, ecat-R-SA exhibited 5.09% reduction in the recovery for sulphur and 24.58% reduction in the recovery for nitrogen. The nitrogen adsorption-desorption analysis suggests the adsorption of compounds by ecat-R may be more correlated with the adsorption sites than with specific area. Overall, the results of this work are promising and allows ecat to integrate a complete CE model.