Fe3O4负载ZnO催化剂的制备及其催化合成松香甘油酯的研究

Preparation of Rosin Glyceride Catalyzed by Fe3O4 Supported ZnO

以Fe3O4作磁性中心,负载ZnO制备了一系列磁性催化剂,并通过TEM、XRD和XPS对其结构和组成进行了表征,经过筛选得出Fe3O4@SiO2-ZnO催化效果最佳,远优于其他催化剂,且具有较好的稳定性能。同时还考察了锌源及其负载量,以及不同反应条件对松香甘油酯合成的影响,结果表明:在以乙酸锌为锌源,锌源理论负载量为0.25 g得到的Fe3O4@SiO2-ZnO(ZnAc2)为催化剂,反应温度为240℃,反应时间为5 h及催化剂用量为0.2 g时,产物松香甘油酯的酯化率为81.5%,酸值为38.6 mg/g。催化剂Fe3O4@SiO2-ZnO(ZnAc2)具有较好的稳定性,重复使用5次后,酯化率保持80%以上。

A series of magnetic catalysts were prepared with Fe3O4 as magnetic center and ZnO as activity center,and the structures and compositions were characterized by TEM,XRD and XPS.The catalytic performances of the prepared catalysts were studied.The results showed that Fe3O4@SiO2-ZnO was of the best catalytic activity and stability.At the same time,the influences of factors on the synthesis of rosin glyceride,such as zinc source and its loading amount,different reaction conditions,were investigated.The results showed that when Fe3O4@SiO2-ZnO(ZnAc2)(zinc acetate as the zinc source,the theoretical load of zinc source 0.25 g)was catalyst,the reaction temperature was 240℃,the reaction time was 5 h,and the catalyst dosage was 0.2 g,the esterification rate and the acid value of rosin glyceride was 81.5%and 38.6 mg/g,respectively.The catalyst Fe3O4@SiO2-ZnO2(ZnAc2)had good stability.After repeated use for 5 times,the esterification rate remained above 80%.