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二氧化硅辅助制备CuCo2O4纳米尖晶石及其催化性能
作者:  丁永鑫 孙爱玲 王素亚   李其明 
单位:(辽宁石油化工大学化学化工与环境学部 辽宁 抚顺 113001) 
关键词:无定型氧化硅 钴酸铜 尖晶石 催化 对硝基苯酚 
分类号:O643.3
出版年,卷(期):页码:2019,47(3):0-0
DOI:
摘要:

 采用无定型氧化硅辅助制备了CuCo2O4纳米尖晶石氧化物,研究了其在对硝基苯酚催化还原中的催化活性。采用X射线衍射仪、扫描电子显微镜等对CuCo2O4纳米尖晶石的形成机制、晶相结构、微观相貌等进行研究。结果表明:基于有机硅前驱体获得的无定型氧化硅可以与CuCo2O4尖晶石氧化物有效复合,有利于抑制CuCo2O4粒子尺寸的长大,并且不会与CuCo2O4发生相间反应。进而通过NaOH热碱溶液处理可以高效刻蚀CuCo2O4–无定型氧化硅复合氧化物中二氧化硅,从而生成纳米尺度CuCo2O4尖晶石粒子,其微观形貌与粒子尺寸与传统方法制备的CuCo2O4明显不同,具有更高的孔隙率和更小的晶粒尺寸。相对于传统方法制备的CuCo2O4尖晶石材料,以无定型氧化硅辅助制备的CuCo2O4纳米尖晶石具有更高的催化活性与稳定性。

 Nano-sized CuCo2O4 spinel oxides were prepared by using amorphous silica. Their activities in catalytic reduction of p-nitrophenol were investigated. The formation mechanism, crystal structure and surface morphologies of nano-sized CuCo2O4 spinels were analyzed by X–ray diffraction and scanning electronic microscopy. The results indicate that amorphous silica can be effectively combined with CuCo2O4 spinels, inhibiting the growth of CuCo2O4 crystals, whereas no inter-phase reaction between CuCo2O4 and amorphous silica occurs. Meanwhile, the amorphous silica can be efficiently leached from CuCo2O4-amorphous silica composite oxides and thus CuCo2O4 spinel nanoparticles can be obtained. The surface morphology and particle size of CuCo2O4 nanoparticles with a higher porosity and a smaller particle size are distinctly different from those of CuCo2O4 prepared by the conventional method. In p-nitrophenol catalytic reduction, CuCo2O4 nanoparticles obtained by silica doping method exhibit higher catalytic activity and stability, compared to CuCo2O4 synthesized by the conventional method.

基金项目:
国家自然科学青年基金(21703091,21201096);辽宁省教育厅重点实验室基础研究项目(LZ2015050)资助。
作者简介:
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