Diameter-dependent catalytic activity of ceria nanorods with various aspect ratios for toluene oxidation
Diameter-dependent catalytic activity of ceria nanorods with various aspect ratios for toluene oxidation
复制标题
DOI：
10.1016/j.cej.2014.07.014
复制
发表时间：
2014-11
影响因子：
15.1
通讯作者：
Yinnian Liao;Lifang He;Chang-Yi Man;Limin Chen;Mingli Fu;Junliang Wu;D. Ye;Bichun Huang
中科院分区：
文献类型：
--
作者：
Yinnian Liao;Lifang He;Chang-Yi Man;Limin Chen;Mingli Fu;Junliang Wu;D. Ye;Bichun Huang
用水热法成功地合成了不同长径比的CeO2纳米棒，不需要任何模板和表面活性剂。用透射电子显微镜、高分辨电子显微镜、X射线衍射仪、氮气吸附/脱附、XPS、拉曼光谱和H2-TPR对样品进行了表征。结果表明，纳米CeO_2的直径和长度分别由NaOH溶液浓度和水热反应时间决定。此外，不同长径比的纳米棒对甲苯的催化活性与直径有关。纳米棒越细，表面Ce3+离子越多，氧空位越多，催化活性越高。在最细的纳米棒上，也是最活跃的催化剂上，还进行了甲苯氧化的连续三次运行，以及在380℃下运行100小时的长期氧化测试。
Ceria nanorods with various aspect ratios were successfully synthesized by a convenient hydrothermal method without any templates or surfactants. The samples were characterized by TEM, HRTEM, XRD, N2adsorption/desorption, XPS, Raman and H2-TPR. The results showed that the diameter and length of the ceria nanorods were determined by the concentration of NaOH solution and the hydrothermal reaction time, respectively. In addition, the diameter-dependent catalytic activity for abatement of toluene had been found over the nanorods with various aspect ratios. The thinner nanorods presented higher catalytic activity owing to the existence of more Ce3+ions and more oxygen vacancy sites on the surface. Over the thinnest nanorods, the most active catalyst, three consecutive runs in toluene oxidation and a longstanding oxidation test running at 380 °C for 100 h were also carried out.