二氧化硅辅助制备CuCo_2O_4纳米尖晶石及其催化性能

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英文篇名：Preparation of Nano-spinel CuCo_2O_4 with Silica and Its Catalytic Properties 作者：李芳 ; 丁永鑫 ; 孙爱玲 ; 王素亚 ; 杨微 ; 李其明 英文作者：LI Fang;DING Yongxin;SUN Ailing;WANG Suya;YANG Wei;LI Qiming;School of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University; 关键词：无定型氧化硅 ; 钴酸铜 ; 尖晶石 ; 催化 ; 对硝基苯酚 英文关键词：amorphous silica;;cobalt copper oxide;;spinel;;catalysis;;p-nitrophenol 中文刊名：GXYB 英文刊名：Journal of the Chinese Ceramic Society 机构：辽宁石油化工大学化学化工与环境学部; 出版日期：2019-01-21 09:32 出版单位：硅酸盐学报 年：2019 期：v.47;No.360 基金：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 语种：中文; 页：GXYB201903015 页数：7 CN：03 ISSN：11-2310/TQ 分类号：88-94

摘要

采用无定型氧化硅辅助制备了CuCo_2O_4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Cu Co_2O_4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Cu Co_2O_4尖晶石氧化物有效复合,有利于抑制Cu Co_2O_4粒子尺寸的长大,并且不会与Cu Co_2O_4发生相间反应。进而通过Na OH热碱溶液处理可以高效刻蚀Cu Co_2O_4–无定型氧化硅复合氧化物中二氧化硅,从而生成纳米尺度Cu Co_2O_4尖晶石粒子,其微观形貌与粒子尺寸与传统方法制备的Cu Co_2O_4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Cu Co_2O_4尖晶石材料,以无定型氧化硅辅助制备的Cu Co_2O_4纳米尖晶石具有更高的催化活性与稳定性。
        Nano-sized CuCo_2O_4 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 CuCo_2O_4spinels were analyzed by X–ray diffraction and scanning electronic microscopy.The results indicate that amorphous silica can be effectively combined with CuCo_2O_4 spinels,inhibiting the growth of CuCo_2O_4 crystals,whereas no inter-phase reaction between Cu Co_2O_4 and amorphous silica occurs.Meanwhile,the amorphous silica can be efficiently leached from CuCo_2O_4-amorphous silica composite oxides and thus CuCo_2O_4 spinel nanoparticles can be obtained.The surface morphology and particle size of Cu Co_2O_4nanoparticles with a higher porosity and a smaller particle size are distinctly different from those of Cu Co_2O_(4 )prepared by the conventional method.In p-nitrophenol catalytic reduction,CuCo_2O_(4 )nanoparticles obtained by silica doping method exhibit higher catalytic activity and stability,compared to CuCo_2O_(4 )synthesized by the conventional method.

引文

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