摘要
目的制备一系列不同形貌的铜纳米颗粒,探讨影响金属纳米晶体形貌和尺寸的因素,并研究其催化性能。方法采用化学还原法和水热法进行合成。结果合成出立方体,小球体,片状和枝状形貌的铜纳米颗粒,并选用立方体和小球体这两种具有代表性的铜纳米颗粒应用于苯羟基化反应中,发现立方体形状的铜纳米颗粒具有更高的催化活性。结论就大多数反应而言,较低的反应前驱物浓度、较低的反应体系温度、较长的反应时间以及适当的助剂,有利于生成形貌规整,尺寸均匀,分散性较好的纳米晶体;且铜纳米颗粒催化活性与其暴露晶面有关,高能晶面的催化活性较高。
Aim To produce copper nanoparticles with different shapes and discuss the influences of sizes and shapes in synthesis of nanoparticles and their catalysis performance. Methods The copper naoparticles were prepared by chemical reduction and hydro-thermal method. Results A series of copper nanoparticles have been prepared, including cubes, near-sphericity, plates and branches. And compared the reactive activity of cubic and near-spherical copper nanoparticles in hydroxylation of benzene. The cubic copper nanoparticles show the higher reactive activity. Conclusion Generally, an uniform sizes and shapes and good dispersity nanoparticles could be prepared by low concentration of reactant, low system temperature, long reactive time and suitable surface active agents. The crystal faces of copper nanoparticles play an essential role in determining the catalytic hydroxylation of benzene. The planes with higher surface energy are more reactive.
出处
《宝鸡文理学院学报（自然科学版）》
CAS
2008年第4期293-297,共5页
Journal of Baoji University of Arts and Sciences(Natural Science Edition)
关键词
铜
纳米结构
催化
copper
nanostructures
catalysis
