Effect of Feeding Methods on Properties of Cerium-Zirconium Composite Oxides
Using co-precipitation method,the lanthanum and yttrium doped cerium-zirconium composite oxides(Ce0.25Zr0.60La0.05Y0.10On)were prepared by changing the feeding methods.It was characterized by XRD,N2 physical adsorption-desorption,particle size analysis and chemical adsorption to study the effect of co-precipitation feeding methods on the properties of cerium-zirconium composite oxides.The results showed that the feeding methods used in the co-precipitation reaction can affect the crystal size of the cerium-zirconium composite oxides,which leads to the difference of pore distribution,high temperature aging resistance and oxygen storage performance.The cerium-zirconium composite oxides prepared by the reverse feeding method has high specific surface area and high temperature aging resistance,and the specific surface area reaches 30.97 m2/g under the aging condition of 1100℃for 4 h.
cerium-zirconium composite oxidesfeeding methodcrystal sizehigh temperature aging resistanceco-precipitation
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