In the present paper,Ce-Zr-Y-La-Mn oxygen storage material was synthesized by co-precipitation method and characterized by X ray diffraction(XRD),BET,TG and temperature programmed reduction(TPR).The effects of textural and structural properties,low temperature redox behavior,and change in phase were investigated at various calcination temperatures.The XRD results show that the samples belong to the same crystalline shift at various calcinations temperature and the fluorite structure of the precipitation keeps unchanged.The new phase is not separated from the solid solution after calcined at 1000℃.The BET results show that the surface area of the sample reaches 45m2/g after aging 5h at 1000℃.The TPR results show that the sample indicates best reducibility calcined at 600℃.
Ce0.65Zr0.35O2 solid solution was prepared by co-precipitation method and characterized by X-ray diffraction (XRD), Raman spectra, BET, oxygen storage capacity (OSC) and temperature-programmed reduction measurements (H2-TPR) after calcination at 100 ℃, 300 ℃, 600 ℃, and 1 000 ℃. The results showed that the precipitation was a crystalline of fluorite structure, and in the process of the precipitation transformation into Ce0.65Zr0.35O2 solid solution, the fluorite structure of the precipitation kept unchanged. The samples had different BET surface areas and OSC at different temperatures, but they held the performance of stable structure. After 1 000 ℃, there didn′t appear the other crystalline phase. So the samples prepared by co-precipitation method had excellent texture and higher thermal stability.
