Pt/Ce0.27Zr0.73O2 and Pt/Ce0.27Zr0.70La0.03Ox. catalysts, prepared by co-precipitation and impregnation methods, were thermally treated at different temperatures for 10h and then characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), H-2 temperature-programmed reduction (H2-TPR), thermogravimetric analysis (TGA) and soot temperature programmed oxidation (soot-TPO). Due to thermal effect on the structural and textural properties, the aged catalysts show increased reduction temperatures. But, interestingly, more H-2 consumption is detected, which would be ascribed to the increased mobility of bulk oxygen and surface lattice oxygen. The promoting and synergistic roles of Pt in H-2-TPR are discussed and it reveals that the sintering and encapsulation of Pt would weaken the H-2 spillover mechanism and the addition of La is beneficial to stabilize the synergistic effect between Pt and Ce. On the other hand, a humble role of Pt on promoting soot oxidation activity is found in this study. Not all oxygen species available in H-2-TPR can be used for soot oxidation. The deactivation of the aged catalysts is closely related to the reduction temperature. (C) 2016 Elsevier B.V. All rights reserved.