Abstract A supported ruthenium (Ru) nanoparticle on amino-functionalized Fe3O4 (Fe3O4/NH2/Ru) was successfully prepared by a novel and simple one-pot template-free method combined with a metal adsorption-reduction procedure. The characterization results show that the introduced amino group (1,6-hexanediamine) can effectively stabilize the Ru nanoparticles and allow the particles to maintain a narrow size distribution, monodispersity and a regular morphology. Fe3O4/NH2/Ru exhibits excellent catalytic activity for the transfer hydrogenation of nitro compounds by the use of NaBH4 as the hydrogen donor. The higher activity of this catalyst was attributed to the higher dispersion and smaller particle size of Ru nanoparticles, as observed from the characterization results. Moreover, the catalyst can be easily recovered by an external magnetic field, recycled five times and reused without any loss of activity.

中文翻译：

---

负载在胺官能化磁性纳米颗粒上的高度分散的 Ru 纳米颗粒的制备：用于还原硝基化合物的高效催化剂

摘要 采用一种新颖、简单的单锅无模板法结合金属吸附还原工艺，成功制备了负载在氨基功能化Fe3O4（Fe3O4/NH2/Ru）上的钌（Ru）纳米颗粒。表征结果表明，引入的氨基（1,6-己二胺）可以有效地稳定 Ru 纳米颗粒，并使颗粒保持窄的尺寸分布、单分散性和规则的形态。Fe3O4/NH2/Ru 以 NaBH4 作为氢供体，对硝基化合物的转移加氢表现出优异的催化活性。从表征结果中可以看出，这种催化剂的较高活性归因于 Ru 纳米粒子的较高分散性和较小的粒径。此外，催化剂可以很容易地通过外部磁场回收，