Structural Design Of Ni-Mo Based Bimetallic Materials And The Performance For The Catalytic Hydrogenation Of Aromatic Nitro Compounds

The development of industry and technology has brought many positive effects,but caused unprecedented damage to the environment,especially water pollution.In industry,there are a lot of residues of common aromatic pollutants in water after conventional treatment,which is difficult to be biodegraded or transformed in the ecosystem.It is of important to convert nitro compounds into amino compounds with high medicinal value.At present,precious metals（Pt,Pd,etc.）are widely studied for hydrogenation of nitro compounds.However,the high price and the scarce reserves in the earth limit the wide application of precious metal-based catalysts.The late transition metal nickel has an electronic structure similar to that of the Pt.The combination of Ni and Mo will produce a synergistic effect,which can significantly improve the catalytic hydrogenation performances.In this thesis,a series of Ni-Mo based bimetallic materials with controllable structure and morphology were prepared,which showed excellent performance for the hydrogenation of nitro compounds.The specific research contents are as follows:（1）The nanotubes have combined the characteristics of 1D structure and hollow structure,being favorable for the application as catalysts..We have constructed Ni Mo-based nanotubes,which showed the good peformance for the conversion of nitro compounds.Firstly,tubular Ni（DMG）₂ was synthesized in the presence of polyvinyl pyrrolidone,then modified with Mo species by using theγ-aminopropyl triethoxysilane as coupled agents.The as-prepared precursors were pyrolyzed through a two-step process to obtain tubular Mo O₂-Ni-Ni₃N.The modification of Mo species significantly improved the hydrogenation performance.The catalyst showed excellent catalytic activity and stability for the hydrogenation of the aromatic nitro compounds,and 0.02 m M p-nitrophenol could be converted to p-aminophenol in 200 s.（2）By combining the advantages of 2D structure and heterojunction,a 2D porous Ni-Ni₃N-NiMoN heterojunction was designed and synthesized,which showed the improed catalytic performance.Firstly,Mo-Ni（OH）₂ sheet-like precursors were synthesized by one-step solvothermal method.Two-dimensional porous Ni-Ni₃N-NiMoN heterojunctional catalysts were synthesized by the pyrolysis.The catalyst showed good catalytic activity for the hydrogenation of various aromatic nitro compounds.It can reduce 0.02 m M p-nitrophenol to p-aminophenol in 45 s.The strong magnetism of the catalyst is beneficial to recycling.The catalyst can maintain good catalytic performance after being recycled for 10 times.