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学科主题: 物理化学
题名: HYDROTHERMAL SYNTHESIS OF ONE-DIMENSIONAL La2O3 NANOMATERIALS
作者: Wang F(王非) ;  Shi RJ(师瑞娟) ;  Huang XM(黄秀敏) ;  Shen WJ(申文杰)
会议名称: the 2nd International Solvothermal & Hydrothermal Association Conference
会议日期: 2010-7-27
出版日期: 2010-07-27
会议地点: 中国
通讯作者: 申文杰
部门归属: 五室
主办者: Institute of Process Engineering, Chinese Academy of Sciences
摘要: Lanthanum oxide, along with other basic oxides such as MgO and CaO, has attracted much attention as an important solid base catalyst for the oxidative dehydrogenation and oxidative coupling of methane in recent years. Recent studies have shown that the amount, strength and distribution of surface basic site on the solid base oxide is closely bound up with its morphology and particle size. However, few studies have focused on the morphology controlled synthesis of La2O3 nanomaterials. Herein, we reported the synthesis of La(OH)3 nanomaterials with the shape of spherical nanoparticles, nanorods and nanowires through a facile hydrothermal synthetic pathway by controlling the hydrothermal temperature, time, pH value of solution. The obtained La(OH)3 exhibited the characteric diffraction of the hexagonal phase of La(OH)3 with lattice constants a=6.5470 Å and c=3.8540 Å (JCPDS# 83-2034). When the pH value of solution is 7, the spherical nanoparticles with size of 30-40 nm was obtained. By increasing the pH value to 9, the nanorods with a diameter of 40 nm and lengths of 150 nm were formed. As the pH value further increased, the length-diameter ratio of La(OH)3 nanorods increased gradually. When the concentration of KOH was 9 M, nanowires with a diameter of 15 nm and lengths of 700 nm were obtained. Apparently, the alkalinity of solution, markedly influence the morphologies of the La(OH)3. With these hydroxide as precursors, the subsequent thermal dehydration process leads to the formation of La2O3 in the shape of nanoparticles, short nanorods and long nanorods. There is no clear morphological changes of Cu/La2O3 catalyst, which was prepared by a deposition-precipitation process and then reduced with pure hydrogen at 573 K for 1 h. 10% Cu/La2O3 in nanorods showed 88 % conversion and more than 99% selectivity for hydrogen-transfer dehydrogenation of nonactivated 1-octanal to the corresponding aldehyde with styrene as hydrogen acceptor, while 10 % Cu/La2O3 in spherical nanoparticles only gave 58% conversion at 423 K for 3 h. CO2-TPD and H2-TPR showed the morphological changes of La2O3 not only modified the amount, strength and distribution of surface basic site, but also changed the strong interaction between Cu and La2O3. Further studies on the relationship between the structure and its catalytic performance are in progress.
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/114118
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:
Wang F,Shi RJ,Huang XM,et al. HYDROTHERMAL SYNTHESIS OF ONE-DIMENSIONAL La2O3 NANOMATERIALS[C]. 见:the 2nd International Solvothermal & Hydrothermal Association Conference. 中国. 2010-7-27.
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