掺杂Sn对低铈型复合氧化物纳米储氧材料性能的影响

采用共沉淀法制备了低铈型Ce-Zr-Sn复合氧化物纳米储氧材料,采用X射线衍射、储氧量、比表面积等研究手段对其进行了分析和表征,结果表明,低铈型Ce（0.35）Zr（0.55-x）SnxLa（0.1）O（1.95）（x=0-0.12）复合氧化物纳米储氧材料具有高的比表面积和储氧量,且物相单一,只含有稳定的立方结构的固溶体晶相。少量Sn的掺入有利于低铈型铈锆固溶体储氧材料热稳定性能和低温储氧性能的提高。当Sn含量（摩尔分数）为0.06时,样品的低温储氧量和比表面积最高,抗老化性能最佳,经1000℃高温老化5h后,储氧量和比表面积仍可达298.1μmo1/g和48.95m~2/g。

Effects of Doping Tin on Properties of Low-Ce Type Oxygen-storage Nanomaterials of Composite Oxides

The low-Ce type oxygen-storage nanomaterials of Ce-Zr-Sn composite oxides were prepared by co-deposit method and characterized by XRD,BET,OSC. The results show that the low-Ce type oxygen-storage nanomaterials Ce0.35Zr0.55-xSnxLa0.1O1.95（x=0-0.12） has high oxygen-storage capacity （OSC） and specific surface area and a single crystalline phase -the solid solution Ce0.35Zr0.55-xSnxLa0.1O1.95 phase which has a stable cube-structure. The incorporating a small amount of Sn into Ce-Zr solid solution contributes to raise the oxygen-storage performance of the materials at the low temperature,heat stability of the materials at the high temperature. The materials has the highest oxygen storage capacity at the low temperature and specific surface area and excellent performance of resistance to aging when Sn content （mole fraction） is 0.06, its OSC is 288.1umol/g,BET is 48.95m^2/g after aging 5 h at 1000℃.