Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (18): 1695-1700. Previous Articles     Next Articles

钒基催化剂在双氧水存在下对甲、乙苯液相选择氧化的研究

汪小强, 欧光南, 袁友珠   

  1. 厦门大学化学系, 固体表面物理化学国家重点实验室, 厦门, 361005
  • 投稿日期:2004-04-14 修回日期:2004-07-26 发布日期:2014-02-17
  • 通讯作者: 袁友珠,E-mail:yzyuan@xnu.edu.cn;Fax:0592-2183047. E-mail:yzyuan@xnu.edu.cn
  • 基金资助:
    国家自然科学基金(No.20021002)资助项目.

Liquid Phase Selective Oxidation of Toluene and Ethylbenzene over V-based Catalysts in the Presence of Hydrogen Peroxide

WANG Xiao-Qiang, OU Guang-Nan, YUAN You-Zhu   

  1. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005
  • Received:2004-04-14 Revised:2004-07-26 Published:2014-02-17

The selective oxidations of toluene and ethylbenzene using hydrogen peroxide over vanadium-based catalysts such as VPO, VOPO4, V2O5, VO(acac)2 and NH4VO3 have been studied. These catalysts were found to be active for the oxidation of toluene and ethylbenzene to benzaldehyde and acetophenone as main products in acetonitrile solvent, respectively. The activity and selectivity, however, in a sequence of decrease order, was found to be followed as: VPOV2O5VOPO4VO(acac)2NH4VO3. The highest selectivities to benzaldehyde from toluene and acetophenone from ethylbenzene were 58.8% and 66.1% over VPO catalyst with P/V=1.1 (molar ratio) in acetonitrile solvent, resepectively. The catalytic performance of VPO with (VO)2P2O7 phase was affected by the molar ratio of P/V, hydrogen peroxide amount, solvent property and temperature. The active center for the oxidation was believed to be (VO)2P2O7 sites (V4+) in combination with dynamic V5+ sites involving a reversible redox cycle.

Key words: V2based catalyst, selective oxidation of toluene and ethylbenzene, hydrogen peroxide, benzaldehyde, acetophenone.