负载Ru的Fe3O4改性碳纳米管催化剂糠醛催化转移加氢研究

Study on catalytic transfer hydrogenation of furfural over Fe3O4 modified carbon nanotubes supported Ru catalyst

采用氢气还原法制备了磁性Fe3O4改性碳纳米管(CNTs)负载Ru催化剂(Ru-Fe3O4/CNTs),以糠醛催化转移加氢反应为探针,考察了催化剂还原温度、Fe3O4负载量及催化反应条件对糠醛加氢性能的影响。结果表明:Ru-Fe3O4/CNTs催化剂最佳还原温度400℃,适宜的Fe3O4负载量(w)5%。磁性Fe3O4的引入不但使催化剂易于回收,同时能提高Ru/CNTs糠醛催化转移加氢性能。糠醛催化转移加氢反应最佳氢供体为异丙醇,Ru-Fe3O4/CNTs催化剂活性组分包括Ru0和RuOx-Fe3O4,催化过程分别遵循金属活性位催化加氢和Lewis酸催化氢转移机理。

Magnetic Fe3O4 modified carbon nanotubes(CNTs)supported Ru catalyst is prepared by hydrogen reduction method.The effects of reduction temperature and Fe3O4 loading on the catalytic transfer hydrogenation of furfural are studied,and the reaction parameters are also tested.The optimal reduction temperature and Fe3O4 loading of Ru-Fe3O4/CNTs catalyst are 400℃and mass fracction of 5%,respectively.The introduction of magnetic Fe3O4 not only makes the catalyst easy to recover,but also effectively enhances the activity of Ru/CNTs catalyst in catalytic transfer hydrogenation of furfural.The optimal hydrogen donor is i-propanol.The corresponding catalyst activity groups include Ru0 and RuOx-Fe3O4,which followed metal-mediated hydrogenation and Lewis acidmediated intermolecular hydride transfer.