The CO hydrogenation over Rh/SiO2-CeO2 was investigated kinetically in order to find the rate equation as a function of CO and Hr partial pressures. Relative to previous findings obtained with Rh/SiO2 a fairly higher dependence on adsorbed CO is evident. Together with additional evidences found by TPD/TPR and IR spectroscopy, this higher dependence has been tentatively associated to a CO in which both the carbon and the oxygen ends are bonded to Rh and Ce3+, respectively. The influence of the support has been emphasized in order to ascertain the role of CeO2 (promoter) relative to Rh/SiO2. In agreement with previous findings we have found that with Rh/SiO2-CeO2 catalysts, the promoter inhibits the total activity while favoring the formation of EtOH.