负载型磷钼钒钴杂多酸盐催化氧化乙苯合成苯乙酮

Catalytic oxidation of ethylbenzene to acetophenone by supported molybdovanadophosphoric cobalt heteropoly acid salt

采用浸渍法制备了系列负载型杂多酸盐催化剂,并将其应用于乙苯氧化合成苯乙酮的反应中。考察了载体类型、负载量、焙烧温度、催化剂用量、反应时间等因素对催化活性的影响。结果表明,以HZSM-5为载体,杂多酸盐Co_4HP_2Mo_(15)V_3O_(62)负载量30%,固定乙苯用量25mmol,催化剂用量0.4g,m(催化剂):m(KBr)=2:3,n(乙苯):n(过氧化氢)=0.125:1,反应温度80℃.反应时间1h,乙苯转化率达到82.21%,苯乙酮收率为55.75%。

A series of supported heteropoly acid salt catalysts were prepared by impregnation method.The catalytic activity of the catalyst for the oxidation of ethylbenzene to acetophenone with H_2O_2 and the effects of reaction conditions were studied.Experimental results show that HZSM-5 as carrier,the conversion of ethylbenzene was 82.21%and the yield of acetophenone was 55.75%under the follow conditions：loading of Co,HP_2 Mo_（15） V_3 O_（62） was 30%,the amount of ethylbenzene 25mmol,catalyst 0.4g,n（ethylbenzene）：n （H_2O_2） =0.125：1,m（Cat）：m（KBr） =2：3,reaction time 1h,the temperature 80℃.