In this work, the influence of the temperature and feed composition on the catalytic behaviour of a Ni-Mg/beta-SiC catalyst in the methane tri-reforming was analysed and modelized. This catalyst was characterized by Atomic Absorption Spectrophotometry (AAS), Temperature Programmed Reduction (TPR), N-2 adsorption, Temperature Programmed Desortion of CO2 (TPD) and X-Ray Diffraction (XRD). 36 catalytic experiments at different temperatures and feed compositions were performed, modifying the quantity of CH4, CO2, H2O and O-2 present in the feed. The predominance of each one of the reactions that took place during the tri-reforming process was evaluated as a function of the temperature, finding at low temperatures a higher contribution of both the steam reforming and the water gas shift reactions. On the contrary, at higher temperatures, a higher contribution of the dry reforming was detected. Finally, a kinetic model was raised and experimental data were fitted to it. Steam reforming, dry reforming and water gas shift reactions were considered as the kinetically relevant equations. A good agreement between experimental and predicted data was observed. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.