The Research Of Carbon Nanospheres Anchored Iron-Tin Bimetallic Oxides Catalyst For Reduction Of Nitroarenes

Aromatic amines are extremely important chemical intermediates for their widespread applications in the herbicides,insecticides,synthetic dye,pharmaceuticals etc.The main method for the preparation of aromatic amines is by reduction of corresponding nitroarenes.With the improvement of environmental protection requirements,traditional methods are unable to adapt to the needs of the society development for producing large amounts of pollutions.In recent years,heterogeneous catalytic hydrogen transfer reduction method has attracted much attention in the field of catalytic hydrogenation because of its advantages of environment-friendly,mild reaction conditions,simple operation,high yield and easy recovery of catalyst.In this paper,a new kind of multi-functional iron-tin oxide composite material has been developed in this background.It is an effective catalyst for reducing nitroaromatics,while hydrazine hydrate as hydrogen source is used in the catalytic reduction of aromatic nitro compounds.The research and important conclusions are summarized as follows:First,we synthesized the carbon nanospheres by hydrothermal carbonation(HTC)as a carrier to immobilize the active catalytic sites.And then the co-precipitation method was used to prepare the iron-tin bimetallic oxide composite catalyst.Finally,the as prepared core-shell structured C@Fe2O3-SnO2 was used to catalyze the reduction of aromatic nitro compounds by using hydrazine hydrate as hydrogen donor and p-nitrophenol as the model substrate.By optimizing the catalyst composition,the amount of catalyst,the stability of the catalyst,the type of solvent,the amount of hydrazine hydrate and other factors on the reaction,we ultimately determined the best composition of the catalyst and the best reaction conditions of reducing p-nitrophenol.The experimental results show that the synergistic effect of the two metal oxides has improved the catalytic activity of the iron-based catalyst.In addition,these nanocatalysts could be collected through magnetic separation and recycled for 10 times without any loss of catalytic activity.In short,the catalyst system possessed the superiority of wide application scope,safety,high efficiency and good chemoselectivity.