催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (11): 1003-1008.

• 研究论文 • 上一篇    下一篇

改性VPO催化剂催化温和条件下苯乙烯液相选择性氧化

刘俊华1,2,王芳1,2,刘艳侠1,2,徐贤伦1   

  1. 1 中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室, 甘肃兰州 730000;2 中国科学院研究生院, 北京 100049
  • 收稿日期:2007-11-25 出版日期:2007-11-25 发布日期:2011-10-13

Liquid-Phase Selective Oxidation of Styrene under Mild Conditions over Modified VPO Catalyst

LIU Junhua1,2, WANG Fang1,2, LIU Yanxia1,2, XU Xianlun1*   

  1. 1 State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, The Chinese Academy of Sciences, Lanzhou 730000, Gansu, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2007-11-25 Online:2007-11-25 Published:2011-10-13

PDF

984

被引次数

47

摘要： 以苯乙烯为原料,分子氧为氧化剂,改性的钒磷氧化物为催化剂合成环氧苯乙烷. 研究了金属修饰成分、P/V比率、溶剂和温度等因素对反应性能的影响. 结果表明, Ag-VPO催化剂对环氧苯乙烷具有最好的选择性,在P/V=1、乙腈为溶剂、65 ℃的反应条件下,苯乙烯转化率为47.3%, 环氧苯乙烷选择性达98.0%.

关键词: 苯乙烯, 环氧化, 钒磷氧化物, 氧气, 银

Abstract: Styrene epoxidation was carried out using styrene as the row material, molecular oxygen as the oxidant, and modified vanadium phosphorus oxide as the catalyst. The results showed that sliver significantly increased the overall activity for the selective oxidation of styrene to styrene oxide. To investigate the silver effect, the catalysts were characterized usingX-raydiffraction, Fourier transform infrared spectroscopy,X-rayphotoelectron spectroscopy, and electron microscopy. The P/V ratio plays a crucial role in the activity and the selectivity of the catalyst. Other factors, such as the metallic constituent, solvent, and reaction temperature, were also studied. Under the optimal conditions (i.e., Ag-VPO as the catalyst, CH3CN as the solvent, 65 ℃), the conversion of styrene is 47.3%, and the selectivity for styrene oxide is up to 98.0%.

Key words: styrene, epoxidation, vanadium phosphorus oxide, oxygen, silver