KF/ZrO_2/Fe_3O_4磁性固体碱催化合成聚甘油的研究

在复合磁性载体ZrO_2/Fe_3O_4上负载碱源KF,制备出KF/ZrO_2/Fe_3O_4磁性固体碱催化剂,通过扫描透射电镜、比表面测试、碱强度、碱量测定等方法对催化剂的形貌结构与碱性进行表征,并将其应用于聚甘油的催化合成中,评价其催化性能。结果显示,该磁性固体碱催化剂表面负载有一定量的KF碱性活性中心,碱强度pH在11.1～15.0之间,总碱量为0.2mmol/g,为固体强碱类催化剂。在聚甘油合成中,反应条件温和,产品聚合度适中,色泽较浅,产物与催化剂易分离,表现出明显的催化活性,具有较高的应用价值与经济价值。

Study on the synthesis of polyglycerol catalyzed by KF/ZrO2/Fe3O4 magnetic solid base

KF/ZrO2/Fe3O4 magnetic solid base catalyst was prepared by impregnation method, which loading alkali source KF on composite magnetic carrier ZrO2/Fe3O4. Its structure and properties were characterized by scanning transmission electron microscope, specific surface test and the determination of base strength and alkali content; its catalytic effect was also evaluated according to the synthesis of polyglycerol. The results showed that this magnetic solid base catalyst belongs to solid strong base with KF alkaline center in the surface, pH between 11.1~15.0 and total alkali 0.2 mmol/g. During synthesis of polyglycerol, the catalyst shows good catalytic performance such as mild reaction condition, moderate polymerization degree, products with light color, easily separate product from the catalysis, which indicates high application value and economic value.