催化学报 ›› 2013, Vol. 34 ›› Issue (9): 1683-1689.DOI: 10.1016/S1872-2067(12)60633-0

• 研究论文 • 上一篇    下一篇

Au/γ-MnO2催化剂催化无溶剂条件下甲苯氧化反应

姜枫, 朱晓文, 符宝嵩, 黄金金, 肖国民   

  1. 东南大学化学化工学院, 江苏南京 211189
  • 收稿日期:2013-04-12 修回日期:2013-06-03 出版日期:2013-09-16 发布日期:2013-08-28
  • 通讯作者: 肖国民
  • 基金资助:

    国家自然科学基金(21276050).

Au/γ-MnO2 catalyst for solvent-free toluene oxidation with oxygen

Feng Jiang, Xiaowen Zhu, Baosong Fu, Jinjin Huang, Guomin Xiao   

  1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, Jiangsu, China
  • Received:2013-04-12 Revised:2013-06-03 Online:2013-09-16 Published:2013-08-28
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21276050).

摘要:

采用氧化还原法制备了α, δ, γ-MnO2载体, 采用原位还原法制备了Au负载量为0.5%-3.0%的Au/γ-MnO2催化剂, 并采用X射线衍射、扫描电镜、透射电镜和N2物理吸附等手段对其进行了表征. 透射电镜照片表明Au/γ-MnO2催化剂中Au颗粒的大小约为10 nm. 采用无溶剂存在下的甲苯氧化反应测试所制备样品的催化活性. 结果表明, 甲苯转化率随着Au负载量的增加而增大. 这是由于Au颗粒数量增多, 尺寸减小的缘故. 同时, 负载Au颗粒对苯甲醛具有较高的选择性. Au/γ-MnO2催化剂具有良好的重复使用性.

关键词: 二氧化锰, 纳米金催化剂, 甲苯氧化, 无溶剂

Abstract:

α-, δ-, and γ-MnO2 were synthesized by a redox method and Au/γ-MnO2 catalysts with different Au loadings (0.5%-3.0%) were synthesized by an in situ reduction method. The supports and catalysts were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy (TEM), and N2 adsorption. TEM images showed that the Au particles were about 10 nm. The catalysts were used in solvent-free toluene oxidation with oxygen. The results showed that toluene conversion increased with increasing Au loading, which was ascribed to the increasing amount of Au particles and also the smaller Au particles. The Au loading gave a uniquely high selectivity to benzaldehyde. The Au/γ-MnO2 catalysts exhibited good reusability in liquid phase toluene oxidation.

Key words: Manganese dioxide, Nano-gold catalyst, Toluene oxidation, Solvent-free