广东工业大学学报 ›› 2018, Vol. 35 ›› Issue (05): 75-79.doi: 10.12052/gdutxb.180054

• 综合研究 • 上一篇    下一篇

不同长度α-MnO2纳米线的可控合成及其催化燃烧性能的研究

廖秀红, 蒋勇, 简国坤, 程高, 孙明   

  1. 广东工业大学 轻工化工学院, 广东 广州 510006
  • 收稿日期:2018-03-19 出版日期:2018-07-10 发布日期:2018-09-11
  • 通信作者: 孙明(1978-),男,副教授,博士,主要研究方向为纳米材料及其应用.E-mail:sunmgz@gdut.edu.cn E-mail:sunmgz@gdut.edu.cn
  • 作者简介:廖秀红(1991-),女,硕士研究生,主要研究方向为过渡金属氧化物的控制合成及性能.
  • 基金资助:
    广东省教育厅特色创新项目（2015KTSCX027）；广东省自然科学基金资助项目（2018A030310563）

Controllable Synthesis of α-MnO2 Nanowire with Different Length and Its Catalytic Combustion Activity

Liao Xiu-hong, Jiang Yong, Jian Guo-kun, Cheng Gao, Sun Ming   

  1. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
  • Received:2018-03-19 Online:2018-07-10 Published:2018-09-11

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摘要： 以高锰酸钾为锰源和氧化剂，通过控制乙酸的用量在水热条件可控合成出具有不同长度的α-MnO2纳米线，采用X射线衍射（XRD）、扫描电镜（SME）、透射电镜（TEM）、拉曼光谱（Raman）、程序升温还原（H2-TPR）等技术对制备的材料的结构以及氧化还原能力进行了表征，并考察了α-MnO2纳米线长度对二甲醚催化燃烧性能的影响.结果表明，α-MnO2纳米线的长度受乙酸含量/酸度的影响，随着乙酸含量增加而减小.纳米线长度还影响α-MnO2的氧化还原性能和二甲醚催化燃烧性能.其中采用1.4 ml乙酸制得的具有中等长度（4~8 μm）的α-MnO2纳米线，催化性能最好，其起燃温度为167℃，完全燃烧温度为240℃，20 h的短期寿命测试表明，该样品具有较好的稳定性.

关键词: MnO2纳米线, 可控合成, 催化燃烧

Abstract: Using KMnO4 as the source of Mn and the oxidant, the α-MnO2 nanowires with different length were synthesized by controlling the amount of CH3COOH under hydrothermal conditions. The structure and redox properties of the α-MnO2 were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman and hydrogen temperature-programmed reduction (H2-TPR) techniques. The catalytic activity of the α-MnO2 in dimethyl ether (DME) combustion was also investigated. The results indicated that the length of α-MnO2 nanowire was determined by the amount of CH3COOH, and the length shortened with the rise of the CH3COOH concentration. The length of the α-MnO2 nanowire affected its redox property and catalytic combustion activity. The α-MnO2 nanowire with the moderate length of 4-8 μm synthesized using 1.4 ml of CH3COOH showed the best catalytic activity with the initial conversion temperature of 167℃ and the total conversion temperature of 240℃ for DME combustion. The time-on-stream 20 h-test shows that the prepared α-MnO2 nanowire has relatively good stability.

Key words: manganese dioxide nanowire, controllable synthesis, catalytic combustion

中图分类号: 

  • O614.7
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[1] 符志伟，程高，林婷，孙明，余林. 二氧化锰制备及催化燃烧甲苯性能研究[J]. 广东工业大学学报, 2016, 33(02): 85-90.
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