不同沉淀剂对铈锆复合稀土氧化物性能的影响

The capability of CeO_2-ZrO_2 rare earth complex oxides influenced by different precipitators

通过选用不同的沉淀剂,利用共沉淀法制备出掺杂过渡金属元素(Fe,Mn,Cu)的CeO2ZrO2多元稀土复合氧化物。样品用X射线衍射(XRD),液氮吸附法(BET)测定比表面积和H2程序升温还原(H2TPR)等进行了表征。研究结果表明以碳酸铵作为反应的沉淀剂制得的样品,可以较好的形成固溶体,并且该固溶体具有大的比表面积,良好的低温还原性能以及高的储氧能力。样品经过1000℃,4h处理后,会发生烧结,其高温热稳定性需要进一步的加强。

CeO2-ZrO2 rare earth complex oxides doped by transitional metals were prepared by the impregnation method through adopting different precipitators. The samples were characterized by XRD, BET and H2-TPR. The results show that the samples prepared with （NH4）aCO3 as a precipitator can easily form a solid solution with high surface areas, favorable reductive capacity at low temperature and high oxygen storage capacity. But the samples will sinter after high temperature treatment and in the future. its stability at high temperature should be enhanced