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%.
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 using X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron 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 % .
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2007年第11期1003-1008,共6页
关键词
苯乙烯
环氧化
钒磷氧化物
氧气
银
styrene
epoxidation
vanadium phosphorus oxide
oxygen
silver
