DICP OpenIR
学科主题物理化学
Morphology-dependent redox behavior of nanostructured cerium dioxides
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
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
页码88/2
部门归属五室
主办者大连化学物理研究所
英文摘要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
文献类型会议论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/112994
专题中国科学院大连化学物理研究所
通讯作者Shen WJ(申文杰)
推荐引用方式
GB/T 7714
Ta N,Zhang ML,Li HJ,et al. Morphology-dependent redox behavior of nanostructured cerium dioxides[C],2008:88/2.
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