Selective Synthesis Of Amines Over Nano Pd-based Catalyst And Ni-based Catalyst

As important intermediates of drugs,pesticides,fine chemicals,dyes and other products,amine compounds play a vital role in daily life.At present in laboratories and industry,the use of heterogeneous transition metal catalysts to synthesize amine compounds is an effective way to obtain them.This thesis mainly includes two parts:（1）Preparation of nano-palladium catalyst（Pd-NPs）and its use in the direct hydrogenation reduction of aldehyde compounds to synthesize aromatic primary amines;（2）Preparation of nano-nickel catalyst（Ni-NPs）and its use in selective reduction of nitrile compounds.In the first part of this thesis,Pd-NPs were prepared by diazotization using2,3-diaminonaphthalene as the ligand and K₂Pd Cl₄ as the metal precursor.Its structure was characterized by TEM,XPS,XRD,EA and ICP-OES.Using H₂ as the hydrogen source,water as the solvent,and ammonia as the amine source under normal temperature and pressure,the effect of Pd-NPs on the direct reductive amination reaction of aromatic aldehydes was studied.The structure of the products was characterized by ¹H NMR and ¹³C NMR.The results showed that the yields of aromatic primary amines were up to 99%.The heterogeneous catalyst could be used for many times without deactivation.In the second part of this thesis,on the basis of the first part,Ni-NPs were prepared with 4-nitro-o-phenylenediamine as the ligand,its structure was characterized by SEM,TEM,XRD,XPS,EA,ICP-OES,FT-IR.Under normal pressure,using H₂ as the hydrogen source and water as the solvent,the effect of Ni-NPs on the selective hydrogenation of nitriles was studied.The structure of the products was characterized by ¹H NMR and ¹³C NMR.The results showed that under the optimal reaction conditions the yields of primary amines were excellent.Compared with Pd-NPs,the halogen atoms on the aromatic ring had no dehalogenation reaction obviously.In addition,Ni-NPs could be easily recycled and reused many times without losing the main catalytic activity,which had great potential in sustainable industrial applications.