The effect of Pt dispersion on the different supports was evaluated. The Pt structural and textural properties have been analyzed by XRD, HRTEM and CO pulse chemisorptions. The redox and structure property between Pt and supports was characterized by H-2-TPR and Raman. CO-DRIFTS characterized the identification of Pt coordination. Results demonstrate that the Pt dispersion is dependent of Ce contents of supports. The Pt supports interaction tends to become weak as Ce content decreasing, leading to higher reduction temperature for active oxygen at low temperature. The stronger interaction for Pt loaded on CeO2 and Ce0.7Zr0.3O2 results in superior CO oxidation performance. The TOF for Pt loaded on Ce based supports presents linear increasing as Pt dispersion increasing. (C) 2014 Elsevier B.V. All rights reserved.