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学科主题: 物理化学
题名: Morphology-dependent redox behavior of nanostructured cerium dioxides
作者: Ta N(塔娜) ;  Zhang ML(张密林) ;  Li HJ(李华举) ;  Huang XM(黄秀敏) ;  Shen WJ(申文杰)
会议名称: Pre-conference of ICC 14-Nanocatalysis: Fundamentals & Applications
会议日期: 2008-7-9
出版日期: 2008-07-09
会议地点: 中国
其他题名: 纳米尺度二氧化铈氧化还原能力的形貌效应
通讯作者: 申文杰
部门归属: 五室
主办者: 大连化学物理研究所
摘要: Ceria has been widely used as a main component in catalysts to promote the reaction performance due to its unique redox property, which depends strongly on the size and morphology.1-2 Here, we prepared CeO2 nanomaterials with several morphologies and found that the CeO2 nanowires could show higher CO oxidation activity and oxygen storage capacity (OSC) than the nanorods, due to its unique crystalline structure. Figure 1 illustrates the SEM/TEM images of the CeO2 nanomaterials. XRD patterns of the nanostructured ceria all showed typical fluorite structure and the crystalline sizes were 7.8 nm (nanowires), 6.5 nm (nanorods) and 6.5 nm (nanoparticles), respectively. The OSC was also remarkably affected by morphology. For example, the OSC value of the CeO2 nanowires was 724 μ mol O2 g-1, while the corresponding value of the nanorods was only 556 μ mol O2 g-1. CO-TPD and CO-TPSR measurements further indicated that the mobility of oxygen in the nanowires was much higher than that of other nanostructures. More importantly, the nanowires showed remarkably high activity for CO oxidation (Figure 2). The CO conversion reached 70% even at 533 K and 100% CO conversion was obtained at 613 K. This phenomenon clearly demonstrates that the CeO2 nanowires are even more active than the CeO2 nanorods, although the later was observed to be more reactive than the nanoparticles.1 Therefore, the redox properties of cerium dioxides greatly rely on their morphologies.
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/112994
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
Ta N,Zhang ML,Li HJ,et al. Morphology-dependent redox behavior of nanostructured cerium dioxides[C]. 见:Pre-conference of ICC 14-Nanocatalysis: Fundamentals & Applications. 中国. 2008-7-9.
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