论文摘要
Nanostructured CeO2-ZrO2 materials are an irreplaceable constituent in catalytic systems for automobile exhaust purification due to their unique oxygen storage capacity（OSC）. However, traditional CeO2-ZrO2 materials are easy to sinter at high temperature, which causes a sharp decrease of OSC. In this paper,La3+ , Nd3+ and Y3+ are chosen as dopants for CeO2-ZrO2 to improve anti-sintering and OSC properties.The Ce0.17Zr0.73La0.02Nd0.04Y0.04O2 powders（CZLNY） were prepared by co-precipitation method. The effects of grain sizes with different mixed chlorinated solution concentrations on performances were investigated. X-ray diffraction（XRD） and transmission electron micrograph（TEM） were performed to calculate the grain sizes of CZLNY. The specific surfaces, OSC and redox properties were investigated by N2 adsorption/desorption and temperature programmed reduction（H2-TPR）. The results show that introducing La3+ , Nd3+ and Y3+ into CeO2-ZrO2 lattice can improve the stability of phase structure and anti-sintering ability. Moreover, low concentration of mixed chlorinated solution remarkably improves structural and textural properties of CZLNY. Relatively large fresh grain exhibits superior thermal stability and OSC under the condition of being calcined at 800℃ for 3 h. The specific surface and OSC are42.37 m2/g and 333.13 mmol/g after calcining at 1000℃ for 10 h, respectively. This is owing to the low sintered driving force of large grain and long-range migration energy of large pores during the sintering process, which are beneficial to the stability of structure in CZLNY materials.
论文目录
文章来源
类型: 期刊论文
作者: Yuhui Zhang,Meisheng Cui,Yongke Hou,Xiaowei Huang,Yongqi Zhang,Qiannan Xue
来源: Journal of Rare Earths 2019年02期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 材料科学
单位: National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals,Grirem Advanced Materials Co.Ltd.
基金: Project supported by the National Key Research and Development Program(2017YFC0211002)
分类号: TB34
页码: 178-184
总页数: 7
文件大小: 10752K
下载量: 30
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