Efficient Chemoselective Hydrogenation Of Nitroarenes Over ?-Fe₂O₃-modified Porous Carbon Catalyst

As we all know,aromatic amine compounds are an important class of intermediates and raw materials for compounds,and are often used to synthesize fine chemicals such as Drugs,coatings,pigments,and synthetic resins.In industry,reduction of aromatic nitro compounds to obtain the corresponding aromatic amines is the main production route.Among them,the catalytic reduction method has been highly praised for its environmental friendliness,high reduction yield and simple post-treatment.Therefore,the development of catalysts with high activity,high selectivity,high stability,and environmental friendliness has attracted widespread attention.According to reports in the literature,the active components of the catalytic reduction of aromatic nitro compounds mainly include non-precious metal cobalt-based,nickel-based catalysts and noble metals such as platinum,palladium,and gold-based catalysts.In recent years,supported catalysts have been widely used because of their unique physical and chemical properties.Therefore,the development of metal nanoparticle-loaded nanomaterials is of great significance in the field of catalysis.The support material often needs a large specific surface area,a unique void structure and stability,so that the metal nanoparticles are uniformly dispersed in the pore structure,so as to facilitate the active contact of the active site with the chemical reaction substrate and the reaction material.In this study,three kinds of nanocatalysts with special morphological structures were designed and constructed:multilayer?-AlOOH-coated hollow aluminosilicate microspheres loaded with palladium nanoparticles?Pd/HAM@?-AlOOH?,?-Fe₂O₃ is supported on a hollow mesoporous carbon microspheres nanocatalyst??-Fe₂O₃/h-MCM?,and?-Fe₂O₃ is supported on a mesoporous carbon catalyst??-Fe₂O₃/MC?.The above-mentioned three types of catalysts,in particular?-Fe₂O₃ supported catalysts,can catalytically reduce nitrobenzene and aromatic nitro compounds containing reductive groups?halo,hydroxyl,aldehyde groups?under mild catalytic conditions.The reaction exhibits excellent catalytic effect and stability.Therefore,the?-Fe₂O₃supported catalyst designed in this study has a promising industrial application prospect in the catalysis of nitro compound synthesis of amino compounds.