Preparation Of Silver-based Catalysts And Eletrochemical Reduction Of N₂ Into NH₃ Under Ambinet Condition

In view of the widely used application of Ammonia(NH3)in production and life,and the pursuit of permanent and sustainable green development,it is urgent to find a synthetic method that can replace the Haber process for industrial ammonia synthesis.Electrochemical ammonia is considered to be the most potential efficient and advantageous ammonia synthesis method.The electrochemical nitrogen reduction(ENRR)uses nitrogen and protons as raw materials,and the external power is provided to reduce the nitrogen to ammonia.Due to the limitations of effective catalysts,high power consumption and low ammonia yield are still bottlenecks that are difficult to break through.This thesis mainly uses simple methods to prepare two electrochemical nitrogen reduction catalysts for ammonia synthesis,and explores their influence on the catalytic effect of ammonia synthesis under different conditions,in order to seek their most excellent ammonia synthesis performance under normal temperature and pressure,and expand their application in electricity.Preparation method and research scope of chemical synthesis ammonia catalyst.The main contents of this paper are as follows:1.Ag-Doped TiO2 nanofibers prepared by electrospinning.The special interface formed after high temperature annealing can effectively convert N2 into NH3 under ambient conditions.The effects of different conditions on the catalytic effects of synthetic ammonia yield,Faraday efficiency,stability and selectivity were explored,including factors such as silver loading,applied potential,electrolyte conditions,by-products,and environmental ammonia content,and characterized and tested the shape.Features such as appearance and structure have been explored for the catalytic mechanism.The study found that compared with the performance in 0.1 mol L-1 HCl,it shows a high NH3 yield rate of 1.327×10-9 mol s-1 cm-2(-0.6 V vs.RHE)and the Faraday efficiency is 0.14%in 0.1 mol L-1 Na2SO4.It also has excellent selectivity,electrochemical stability and durability.2.The AgFe bimetallic nanospheres prepared by the one-step significantly promote electron transfer and have excellent electrochemical nitrogen reduction performance.Explored the influence of different conditions on the catalytic effect of synthetic ammonia yield,Faraday efficiency,stability and selectivity,including factors such as the amount of bimetal,applied potential,by-products,and environmental ammonia content,and characterized and tested the morphological structure and other characteristics The catalytic mechanism was explored.The study found that AgFe bimetallic nanospheres shows NH3 yield rate of 1.404×10-10 mol s-1 cm-1(-0.5 V vs.RHE)and FE of 0.563%in 0.1 mol L-1 Na2SO4.Compared with the Ag-Doped TiO2 nanofibers,although the ammonia yield is slightly insufficient,the Faraday efficiency is improved.