Acta Chimica Sinica ›› 2005, Vol. 63 ›› Issue (12): 1049-1054. Previous Articles     Next Articles

Original Articles

Keggin型钼钒磷杂多酸催化剂上丙烷选择氧化性能的研究

李秀凯,雷宇,江桥,赵静*,季伟捷*,张志炳,陈懿   

  1. (南京大学化学化工学院 南京 210093)
  • 收稿日期:2004-09-28 修回日期:2005-02-25 出版日期:2005-06-28 发布日期:2010-12-10
  • 通讯作者: 季伟捷

Partial Oxidation of Propane over Keggin Type Molybdovanadophosphoric Acids

LI Xiu-Kai, LEI Yu, JIANG Qiao, ZHAO Jing*, JI Wei-Jie*, ZHANG Zhi-Bing, CHEN Yi   

  1. (School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093)
  • Received:2004-09-28 Revised:2005-02-25 Online:2005-06-28 Published:2010-12-10
  • Contact: JI Wei-Jie

Partial oxidation of propane over Keggin type molybdovanadophosphoric acids was studied. The physico-chemical properties of the catalysts were investigated by means of BET, UV-visible diffuse reflectance spectra, IR and TPR, and the preliminary structure-performance relationship was established. The substitution of Mo6+ with V5+ in Keggin structure decreased the vibration strength of bridging M—O bonds and significantly increased the oxidation and oxygen insertion abilities of Keggin oxoanion, thus influencing the catalytic activity and selectivity to oxygenated products. Optimized vanadium atom substitution enhanced the selectivity to acid products and the optimal selectivity could be obtained on the H5PMo10V2O40 catalyst. However, excessive vanadium substitution led to deep oxidation of the acid products. It was thought that appropriate amount of (VO)2+and small amount of vanadic oxide species segregating from the primary and the secondary structures of the oxo-anions have an impact on the reaction performance.

Key words: molybdovanadophosphoric acid, propane oxidation, vanadium species