The selective oxidation of CO in the presence of H2O and CO2 has been studied on Pt supported on different zeolitic materials (MOR, ZSM-5, FAU and ETS-10) using a range of operating conditions and a variety of characterization techniques. The behavior of the Pt-ETS-10 and Pt-FAU catalysts has been investigated in more depth and the results obtained have been compared and related to the different characteristics of the supports. The best results in the presence of H2O and CO2 were obtained with Pt-FAU catalysts, showing stable catalytic activity and complete conversion of CO (lambda = 2) at 439 K. (C) 2009 Elsevier B.V. All rights reserved.