Abstract: In order to study the influence of oxygen storage materials′ preparation methods on their properties of oxygen storage capacity (OSC), surface area and reductive property, rare earth oxygen storage materials were prepared by different precipitation methods. Physical-chemical methods such as BET, XRD, H2-TPR and so on were used to study properties of these oxygen storage materials. Results indicated that solid solution could be got whichever method was used. But the properties of samples are sensitive to the preparation methods. When CeO2-ZrO2 was prepared by adding cerium and zirconium nitrate solution and ammonia solution simultaneously, the sample obtained had good OSC and high surface area. When CeO2-ZrO2 was prepared by adding the ammonia solution into the above nitrate solution, the sample obtained had poor but stable OSC and low surface area. When CeO2-ZrO2 was prepared by adding the above nitrate solution into the ammonia solution, the sample obtained had good OSC and low surface area. We also find that the OSC of materials prepared has no dependence on surface area but the reductivity of the materials depends on the surface area.

Key words: Oxygen storage material, Precipitation method, Structure and properties