This work aims the study of decomposition kinetics of guarana seed residue using thermogravimetric analyzer under synthetic air atmosphere applying heating rates of 5, 10, and 15 degrees C/min, from room temperature to 900 degrees C. Three thermal decomposition stages were identified: dehydration (25.1-160 degrees C), oxidative pyrolysis (240-370 degrees C), and combustion (350-650 degrees C). The activation energies, reaction model, and pre-exponential factor were determined through four isoconversional methods, master plots, and linearization of the conversion rate equation, respectively. A scheme of two-consecutive reactions was applied validating the kinetic parameters of first-order reaction and two-dimensional diffusion models for the oxidative pyrolysis stage (149.57 kJ/mol, 6.97 x 10(10) 1/s) and for combustion stage (77.98 kJ/mol, 98.61 1/s), respectively. The comparison between theoretical and experimental conversion and conversion rate showed good agreement with average deviation lower than 2%, indicating that these results could be used for modeling of guarana seed residue. (C) 2016 Elsevier Ltd. All rights reserved.