Abstract: A CeO2-ZrO2-Y2O3 oxygen storage material was prepared by a surfactant polyethylene glycol-modified coprecipitation method. The influence of the surfactant amount and addition manner on the performance of the oxygen storage material was investigated in detail. The crystal structure, oxygen storage capacity (OSC), reduction performance, and textural properties of the material were characterized usingX-raydiffraction, oxygen pulse adsorption, H2 temperature-programmed reduction, and N2 adsorption. The surfactant amount and addition manner significantly influenced the performance of the oxygen storage material. With the increase of the surfactant amount, the OSC of the material first increased and then decreased,and reached the highest value when the surfactant amount was 50%. Compared with the material prepared by adding all the surfactant before the precipitation step, the material prepared by adding the surfactant in twice (before the precipitation step and before the dryness step) had larger specific surface area and pore volume and better anti-high temperature aging. When the surfactant was added by once, the material lost the pores smaller than 10 nm after calcination at1000℃, but when the surfactant was added in twice, the material still maintained these pores after calcination.

Key words: cerium, zirconium, yttrium, complex oxide, oxygen storage material, surfactant, polyethylene glycol, textural property