Subject Area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)
Conference NamePre-conference of ICC 14-Nanocatalysis: Fundamentals & Applications
Conference Date2008-7-9
Conference Place中国
Alternative Title纳米尺度二氧化铈氧化还原能力的形貌效应
Funding Organization大连化学物理研究所
AbstractCeria 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.
Document Type会议论文
Corresponding AuthorShen WJ(申文杰)
Recommended Citation
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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