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Palladium nanoparticles supported on core-shell and yolk-shell Fe3O4@nitrogen doped carbon cubes as a highly efficient, magnetically separable catalyst for the reduction of nitroarenes and the oxidation of alcohols

Movahed, Siyavash Kazemi, Lehi, Noushin Farajinia, Dabiri, Minoo
Journal of catalysis 2018 v.364 pp. 69-79
annealing, borohydrides, carbon, catalysts, catalytic activity, ferric oxide, hydrochloric acid, hydrogen, magnetism, nanoparticles, oxidation, p-nitrophenol, palladium, sodium
The preparation of palladium nanoparticles (Pd NPs) supported on Fe3O4@nitrogen doped carbon (N-C) core-shell (C-S) and yolk–shell (Y-S) nanostructures is reported. The Fe3O4@N-C@Pd C-S nanostructures were synthesized by two different methods. The first method included two steps: (i) the annealing treatment of the Fe2O3@polydopamine (PDA) under a gas mixture of Ar/H2 flow and (ii) the decorating Pd NPs on the surface of annealed structures by sodium borohydride as a reducing reagent. The second method, the in-situ reduction of Fe2O3 and Pd²⁺ in the structure of Fe2O3@PDA@Pd²⁺ by annealing treatment under H2 flow as a reducing reagent led to Fe3O4@N-C@Pd C-S nanostructure. Additionally, the Y-S nanostructures were synthesized by using a HCl solution as an effective etching reagent to the partially etch the Fe3O4. Four types of Pd-based catalysts were tested in the selective reduction of p-nitrophenol (p-NP) to p-aminophenol (p-AP). Different catalytic activities were obtained through these catalysts. Furthermore, the reduction of nitroarenes and the oxidation of benzylic alcohols were also studies.