| 共沉淀法和模板法制备均匀负载CeO2/ SiO2的研究 |
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| 引用本文： | 杨栋,文明芬,宋崇立,陈靖,顾永万.共沉淀法和模板法制备均匀负载CeO2/ SiO2的研究[J].无机化学学报,2005,21(11):1705-1709. |
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| 作者姓名： | 杨栋 文明芬 宋崇立 陈靖 顾永万 |
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| 作者单位： | 1. 清华大学核能与新能源技术研究院,北京,102201
2. 昆明贵研催化剂有限公司,昆明,650101 |
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| 基金项目： | 云南省省校联合项目(No.2003BAACA00A036)资助。 |
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| 摘 要： | CeO2是三效催化剂(简称TWC)中被广泛应用的涂层材料1],其优良的储放氧能力(OSC)可以扩大TWC的工作窗口,并可以在与γ-Al2O3的相互作用中提高Al2O3的高温稳定性2]。在高温下,CeO2会因晶粒迅速长大而失去储放氧能力。为了提高CeO2的高温抗烧结能力,以及进一步提高其氧化还原能力,大部分研究者选择了在CeO2晶格中掺入其他离子的方法,如:Zr4 、Pr3 、La3 等3￣5],这些离子在CeO2晶格中引入了晶格缺陷,不但稳定了结构,而且提高了氧传输能力。SiO2具有很高的化学稳定性、高比表面及高热稳定性,是载体的理想选择。研究表明,CeO2负载…
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| 关 键 词： | CeO2 /SiO2 均匀负载 共沉淀法 模板法 |
| 文章编号： | 1001-4861(2005)11-1705-05 |
| 收稿时间： | 2005-03-28 |
| 修稿时间： | 2005-05-27 |
Study on Uniformly Supported Structure of CeO2/SiO2 Prepared by Coprecipitation and Surfactant-assisted Method |
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| YANG Dong,WEN Ming-Fen,SONG Chong-Li,CHEN Jing and GU Yong-Wan.Study on Uniformly Supported Structure of CeO2/SiO2 Prepared by Coprecipitation and Surfactant-assisted Method[J].Chinese Journal of Inorganic Chemistry,2005,21(11):1705-1709. |
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| Authors: | YANG Dong WEN Ming-Fen SONG Chong-Li CHEN Jing and GU Yong-Wan |
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| Institution: | Institute of Nuclear energy technology, Tsinghua University, Beijing 102201,Institute of Nuclear energy technology, Tsinghua University, Beijing 102201,Institute of Nuclear energy technology, Tsinghua University, Beijing 102201,Institute of Nuclear energy technology, Tsinghua University, Beijing 102201 and Kunming Sino-Platinum Metals Catalyst Limited Corporation, Kunming 650101 |
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| Abstract: | XRD, Raman, TEM, and N2-adsorption were utilized to characterize CeO2/SiO2 prepared by coprecipitation and surfactant-assisted method. The results show that nanocrystalline CeO2 can be uniformly supported on the surface of SiO2 particles, when the molar ratio of Si4+/(Ce3++Si4+) is less than 35% in coprecipitation samples. At higher Si content, the surface of SiO2 can not be fully covered by CeO2. With surfactant (CTAB) added, the uiformly supported structure can even exist when the molar ratio of Si4+/(Ce3++Si4+) is as high as 53%. It is because Ce and Si complexes can be well dispersed in precursor solution in present of CTAB. However, the uniformly supported structure can not be synthesised through surfactant-assisted approch for its hydrothermal threatment, which can easily lead to separate aggregation of nanocrystalline CeO2 and SiO2 particles. |
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| Keywords: | CeO2/SiO2 uniformly supported structure coprecipitation surfactant-assisted method |
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