Novel Urchin-like CuO Synthesized by a Facile Reflux Method with Efficient Olefin Epoxidation Catalytic Performance
Novel Urchin-like CuO Synthesized by a Facile Reflux Method with Efficient Olefin Epoxidation Catalytic Performance
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DOI：
10.1021/cm802915m
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发表时间：
2009-04-14
影响因子：
8.6
通讯作者：
Suib, Steven L.
中科院分区：
文献类型：
--
作者：
Xu, Linping;Sithambaram, Shanthakumar;Suib, Steven L.
CuO是一种重要的过渡金属氧化物，具有窄带隙（E-g = 1.2eV）。CuO已被用作锂离子电池阳极材料中的催化剂、气体传感器。CuO还被用于制备高温超导体和磁阻材料。本文采用简单的回流法合成了海胆状CuO。回流法与其他基于溶液的技术相比具有优点，例如易于操作，安全性和高收率（95%）。XRD结果表明，产物为纯的钛酸铜。FE-SEM显示CuO的形貌为海胆状，由纳米条状的聚集体组成。HR-TEM显示条带为单晶，晶格边缘为2.3埃，对应于（111）。DSC和TGA结果表明，合成的CuO具有较高的热稳定性。时间依赖性的实验进行说明的海胆状形貌和CuO的晶相形成的演变。研究了铜源和沉淀剂对产物物相和形貌的影响。合成的CuO对烯烃环氧化反应的催化性能明显优于工业CuO和由氢氧化铜热分解制备的CuO，产率从64.3%提高到89.5%。
CuO is an important transition metal oxide with a narrow bandgap (E-g = 1.2 eV). CuO has been used as a catalyst, a gas sensor, in anode materials for Li ion batteries. CuO has also been used to prepare high temperature superconductors and magnetoresi stance materials. In this paper, CuO with urchin-like morphologies has been synthesized via a simple reflux method. The reflux method has advantages over other solution-based techniques, such as ease of operation, safety, and high yield (95%). XRD results showed pure tenorite CuO was produced. FE-SEM exhibited an urchin-like morphology of CuO, which is composed of aggregates of nanosized strips. HR-TEM showed that the strips were single crystals with the lattice fringe of 2.3 angstrom, which corresponds to (111). DSC and TGA results suggested that as-synthesized CuO had high thermal stability. Time-dependent experiments were conducted to illustrate the evolution of the urchin-like morphology and crystal phase formation of CuO. The effects of copper sources and precipitators on the phase and morphology of the products were studied. As-synthesized CuO showed much better catalytic performance, increased yield (from 64.3% to 89.5%) for olefin epoxidation than commercial CuO and CuO prepared by thermal decomposition of copper hydroxide.