The oxides Of CeO2 and CexZr1-xzO2, and the surface oxides Of w%CeO2/(SiO2 or Al2O3) and w%CexZr1-xO2/(SiO2 or Al2O3) were prepared, characterized, and used as supports for preparing platinum catalysts for the reforming of CH4/CO2- CO2 or CH4 pulse reaction/adsorption analysis elucidated the effects of the redox characteristics of these oxides on the reforming of CH4/CO2. The redox properties of Cc (4+)/Ce3+ in CeO2 and CexZr1-xO2 supports facilitated the activities and stability of Pt catalysts in the reforming of CH4/CO2. Cerium oxide released lattice oxygen, promoting the adsorption of CH4 and reacting with C-(a) and CHx(a), thus accelerating the removal of surface carbon and suppressing the successive dissociation of CHx(a) on Pt. The oxygen vacancies promoted the adsorption Of CO2 and facilitated its reaction with CHx(a); these vacancies were replenished by the dissociation Of CO2 near the metal sites. Zirconium was incorporated into CeO2 to increase the mobility of lattice oxygen by using the co-precipitation method and to increase the activities and stability of 0.5%Pt/CexZr1-xO2 catalysts. Cerium oxide was stabilized on Al2O3 and still exhibited reversible reducibility, and the catalysts for the reforming of CH4/CO2 remained stable at temperatures above 700 degrees C.