| Effect of Manganese Doping on Oxygen Storage Capacity of Ceria-Zirconia Mixed Oxides |
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| 作者姓名： | 吴晓东 梁清 翁端 |
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| 作者单位： | Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金 |
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| 摘 要： | CeO2-ZrO2-MnOx mixed oxide series were prepared by sol-gel method. CO pulse and CO-O2 cycle measurements were carried out to examine the oxygen storage complete capacity （OSCC） and dynamic oxygen storage capacity （OSC） of the samples. The doping method brought about strong interactions between manganese oxide and ceria, both in the bulk and on the surface. Only a small part of Mn cations are incorporated into the ceria lattice to form solid solutions and the remaining are left on the surface as finely dispersed Mn3O4. The OSC behaviors of the materials are influenced by the doping amount of Mn and the solubility of Mn in the CeO2 lattice. The OSC is more easily affected by available contents of oxygen storage components when the measurement frequency is low. Comparatively, the concentration of lattice defects, which affects the mobility of bulk oxygen, is the determining factor under high frequency.
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| 关 键 词： | CeO2-ZrO2混合氧化物 Mn掺杂 OSCC 动态OSC 稀土元素 |
| 文章编号： | 1002-0721（2006）05-0549-05 |
| 收稿时间： | 2006-04-11 |
| 修稿时间： | 2006-05-18 |
Effect of Manganese Doping on Oxygen Storage Capacity of Ceria-Zirconia Mixed Oxides |
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| Xiaodong , Qing Liang,Duan Weng.Effect of Manganese Doping on Oxygen Storage Capacity of Ceria-Zirconia Mixed Oxides[J].Journal of Rare Earths,2006,24(5):549-553. |
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| Authors: | Xiaodong Qing Liang Duan Weng |
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| Affiliation: | aLaboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | CeO2-ZrO2-MnOx mixed oxide series were prepared by sol-gel method. CO pulse and CO-O2 cycle measurements were carried out to examine the oxygen storage complete capacity (OSCC) and dynamic oxygen storage capacity(OSC) of the samples. The doping method brought about strong interactions between manganese oxide and ceria, both in the bulk and on the surface. Only a small part of Mn cations are incorporated into the ceria lattice to form solid solutions and the remaining are left on the surface as finely dispersed Mn3O4. The OSC behaviors of the materials are influenced by the doping amount of Mn and the solubility of Mn in the CeO2 lattice. The OSC is more easily affected by available contents of oxygen storage components when the measurement frequency is low. Comparatively, the concentration of lattice defects, which affects the mobility of bulk oxygen, is the determining factor under high frequency. |
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| Keywords: | CeO2-ZrO2 mixed oxides Mn doping OSCC dynamic OSC rare earths |
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