Abstract: Fe3O4 nanoparticles were prepared by chemical co-precipitation，and magnetic composite nanoparticles of SiO2/Fe3O4 and Al2O3/SiO2/Fe3O4 with core-shell structure were obtained by coating SiO2 or Al2O3/SiO2 in situ through carbonation precipitation of Na2SiO3 and NaAlO2. The composite nanoparticles were characterized using X-ray diffraction（XRD），scanning electron microscopy（SEM），Fourier transform infrared spectroscopy（FT-IR）and vibration sample magnetometer（VSM）. Supported metal catalysts were prepared by loading Ru and Ru-Co on the surface of magnetic composite nanoparticles，the catalytic activity of which were evaluated in toluene hydrogenation. The magnetic catalyst of Ru/pvp/SiO2/Fe3O4 showed high activity and could be recycled for six times without activity loss. While the catalyst of Ru/pvp/Al2O3/SiO2/Fe3O4 showed a higher activity at the beginning，and a little activity decrease in the later recycles. The bimetallic catalyst of Ru-Co showed activity strongly related to the formulation and composition，which was found in the order of RushellCocore＞Ru-Co＞CoshellRucore. The catalyst of RushellCocore/SiO2/Fe3O4 with 1∶5 of Ru/Co exhibited excellent activity for of toluene hydrogenation with a TOF of 16 656，which is higher than that of the monometallic Ru/pvp/SiO2/Fe3O4（9828 TOF）under the same reaction conditions.

摘要： 通过化学共沉淀法制备了Fe3O4，以硅酸钠、铝酸钠为原料，碳分法原位对其进行表面包覆，制备出具有核壳结构的SiO2/Fe3O4及Al2O3/SiO2/Fe3O4复合磁性纳米粒子。利用XRD、SEM、FTIR以及VSM技术对其进行了表征。将所制备的这两种磁性载体分别负载金属Ru及Ru-Co催化剂，以甲苯为底物考察了负载催化剂的组成与催化加氢活性的关系。结果表明，以SiO2/Fe3O4为载体负载的催化剂具有很好的催化活性，循环使用6次后活性未下降；以Al2O3/SiO2/Fe3O4为载体所负载的催化剂，起始催化活性较高，循环过程中活性略微降低。双金属Ru-Co催化剂的催化性能与其形成的结构及组成密切相关，催化活性为RushellCocore＞Ru-Co＞CoshellRucore，Ru/Co的摩尔比为1∶5的RushellCocore/PVP/SiO2/Fe3O4催化剂对甲苯有较高的催化活性，催化剂的转化频率可达16 656，高于相同条件下的单金属Ru催化剂的转化频率（9828）。