| Structure and oxygen storage capacity of Pr-doped Ce_（0.26）Zr_（0.74）O_2 mixed oxides |
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| 引用本文： | 冉锐,翁端,吴晓东,樊俊,王蕾,吴筱笛. Structure and oxygen storage capacity of Pr-doped Ce_（0.26）Zr_（0.74）O_2 mixed oxides[J]. 中国稀土学报(英文版), 2011, 29(11): 1053-1059. DOI: 10.1016/S1002-0721(10)60597-2 |
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| 作者姓名： | 冉锐 翁端 吴晓东 樊俊 王蕾 吴筱笛 |
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| 作者单位： | Laboratory of Advanced Materials;Department of Materials Science and Engineering;Tsinghua University;The Administrative Center for China's Agenda 21; |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (50972069); the Ministry of Science and Technology, China (2009AA064803); the Chinese Ministry of Industry and Information Technology |
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| 摘 要： | Binary Ce-Zr(CZ),Pr-Zr(PZ) and ternary Ce-Zr-Pr(CZP) mixed oxides were prepared by an ammonia-aided co-precipitation method,and were aged in a steam/air flow at 1050 °C.X-ray diffraction(XRD),Raman spectra,X-photon spectra(XPS) and CO temperature programmed reduction(TPR) were carried out to characterize the micro-structure and reducibility of catalysts.The oxygen storage capacity(OSC) was evaluated with CO serving as probe gas.The results showed that a pseudo cubic structure was formed for the Zr-rich ceria-zirconia mixed oxides with Pr doping.The insertion of Pr prevented the phase segregation of the mixed oxides during the hydrothermal ageing.The Pr doped samples showed better redox performances in comparison with CZ,and the sample doped with 5 wt.% Pr showed the most remarkably promoted dynamic oxygen storage capacity.This phenomenon was closely related to both the reducibility and oxygen mobility of the mixed oxides.The introduction of praseodymium into ceria-zirconia could accelerate the oxygen migration by increasing the amount of oxygen vacancies,although it was difficult for Pr3+ ions themselves to participate in the oxygen exchange process.
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| 关 键 词： | ceria-zirconia Zr-rich praseodymium oxygen storage capacity rare earths |
| 收稿时间： | 2011-05-17 |
Structure and oxygen storage capacity of Pr-doped Ce_(0.26)Zr_(0.74)O_2 mixed oxides |
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| RAN Rui ,WENG Duan ,WU Xiaodong ,FAN Jun ,WANG Lei ,WU Xiaodi. Structure and oxygen storage capacity of Pr-doped Ce_(0.26)Zr_(0.74)O_2 mixed oxides[J]. Journal of Rare Earths, 2011, 29(11): 1053-1059. DOI: 10.1016/S1002-0721(10)60597-2 |
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| Authors: | RAN Rui WENG Duan WU Xiaodong FAN Jun WANG Lei WU Xiaodi |
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| Affiliation: | RAN Rui 1,WENG Duan 1,WU Xiaodong 1,FAN Jun 2,WANG Lei 1,WU Xiaodi 1(1.Laboratory of Advanced Materials,Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China,2.The Administrative Center for China's Agenda 21,Beijing 100038,China) |
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| Abstract: | Binary Ce-Zr (CZ), Pr-Zr (PZ) and ternary Ce-Zr-Pr (CZP) mixed oxides were prepared by an ammonia-aided co-precipitation method, and were aged in a steam/air flow at 1050 °C. X-ray diffraction (XRD), Raman spectra, X-photon spectra (XPS) and CO temperature programmed reduction (TPR) were carried out to characterize the micro-structure and reducibility of catalysts. The oxygen storage capacity (OSC) was evaluated with CO serving as probe gas. The results showed that a pseudo cubic structure was formed for the Zr-rich ceria-zirconia mixed oxides with Pr doping. The insertion of Pr prevented the phase segregation of the mixed oxides during the hydrothermal ageing. The Pr doped samples showed better redox performances in comparison with CZ, and the sample doped with 5 wt.% Pr showed the most remarkably promoted dynamic oxygen storage capacity. This phenomenon was closely related to both the reducibility and oxygen mobility of the mixed oxides. The introduction of praseodymium into ceria-zirconia could accelerate the oxygen migration by increasing the amount of oxygen vacancies, although it was difficult for Pr3+ ions themselves to participate in the oxygen exchange process. |
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| Keywords: | ceria-zirconia Zr-rich praseodymium oxygen storage capacity rare earths |
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