催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (5): 870-877.DOI: 10.3724/SP.J.1088.2012.11010

• 研究论文 • 上一篇    下一篇

超细 Fe-V-O 催化剂上甲苯液相氧化制苯甲醛

张贵泉, 张昕*, 祁敏, 林涛, 龚婷   

  1. 西北大学化工学院, 陕西西安 710069
  • 收稿日期:2011-11-26 修回日期:2012-01-19 出版日期:2012-05-09 发布日期:2012-05-09

Superfine Fe-V-O Catalyst for Liquid-Phase Oxidation of Toluene to Benzaldehyde

ZHANG Guiquan, ZHANG Xin*, QI Min, LIN Tao, GONG Ting   

  1. School of Chemical Engineering, Northwest University, Xi’an 710069, Shaanxi, China
  • Received:2011-11-26 Revised:2012-01-19 Online:2012-05-09 Published:2012-05-09

PDF

754

被引次数

14

摘要： 分别采用共沉淀法, 凝胶自燃烧法和水热法制备了 Fe-V-O 复合氧化物催化剂用于催化过氧化氢液相氧化甲苯制苯甲醛反应中, 并采用 N2 等温吸附-脱附法, 粉末 X 射线衍射, 红外光谱, 扫描电子显微镜, 能量弥散 X 射线光谱和 H2 程序升温还原等方法对催化剂性质进行了表征. 结果表明, 制备方法显著影响催化剂的结构, 比表面积, 形貌, 表面元素组成和还原性. Fe-V-O 催化剂颗粒的超细化调变了其比表面积和还原性, 从而改善了催化剂上甲苯液相氧化制苯甲醛反应性能. 其中水热法制备的超细 Fe-V-O 催化剂具有最高的苯甲醛收率和较好的重复使用性能. 这主要归因于该催化剂颗粒尺寸小, 比表面积大, 以及表面较多的活性钒氧物种和适宜的还原性.

关键词: 铁, 钒, 复合氧化物, 甲苯, 液相氧化, 苯甲醛

Abstract: Iron-vanadium oxide catalyst (Fe-V-O) samples were prepared by co-precipitation, gel combustion, and hydrothermal method, respectively. The catalytic activity of the as-prepared catalyst in the liquid-phase oxidation of toluene by hydrogen peroxide was tested. In addition, the physicochemical properties of these samples were characterized by N2 adsorption-desorption, powder X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and H2 temperature-programmed reduction. The preparation method significantly affected the structure, specific surface area, morphology, surface V/Fe ratio and reducibility of the as-prepared catalyst samples. Fe-V-O sample prepared by hydrothermal method exhibited the highest benzaldehyde yield and better reusability compared with other investigated samples, due to its smaller particle size, larger specific surface area, higher V/Fe surface ratio and the moderate reducibility.

Key words: iron, vanadium, composite oxide, toluene, liquid-phase oxidation, benzaldehyde