In this paper, we prepared the sub-microspherical Fe3O4@PDA-Pd NPs catalyst apply it efciently in the hydrogenation reduction of halogenated aromatic nitro compounds to prepare the halogenated aromatic amines under atmospheric pressure. | Preparation of sub-microspherical Fe3O4@ PDA-Pd NPs catalyst and application in catalytic hydroreduction reaction of halogenated aromatic nitro compounds to prepare halogenated aromatic amines