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研究了双核金属卟啉仿生催化丙烯的环氧化反应。考察了反应温度、反应时间、丙烯醛和丙烯的摩尔比、催化剂摩尔分数和种类对反应的影响,适宜的反应条件是:反应温度为100℃,反应时间为1.5 h,催化剂的摩尔分数为9.72×10~(-5)%,醛烯摩尔比为0.625,搅拌速率为500 r/min。结果表明,双核金属卟啉的中心金属、环外取代基对催化活性同样具有影响,不同取代基的双核Cu金属卟啉催化活性顺序为—OCH_3>—H>—F;不同中心金属的双核金属卟啉催化活性顺序为Fe>Cu。其中催化效果较好的为[T(p-OCH_3)PPFe]_2O,丙烯转化率为29.06%,环氧丙烷的收率和选择性分别为27.31%和93.95%。
The epoxidation of propylene catalyzed by binuclear metalloporphyrin was studied. The effects of reaction temperature, reaction time, molar ratio of acrolein to propylene, molar fraction of catalyst and species on the reaction were investigated. The optimum reaction conditions were as follows: the reaction temperature was 100 ℃, the reaction time was 1.5 h, the molar fraction of catalyst was 9.72 × 10 ~ (-5)%, molar ratio of aldehyde to 0.625, stirring rate of 500 r / min. The results showed that the central and exocyclic substituents of binuclear metalloporphyrins also had the same effect on the catalytic activity. The catalytic activity of binuclear Cu metalloporphyrins with different substituents was -OCH 3> -H> -F. The different central metal binuclear metal The order of catalytic activity of porphyrin is Fe> Cu. Among them, [T (p-OCH_3) PPFe] _2O with good catalytic effect was 29.06% propylene conversion and the yield and selectivity of propylene oxide were 27.31% and 93.95% respectively.