Study On Dehydrogenation Of Hydrazine Hydrate By Ni-Pt Bimetallic Catalyst

The energy crisis caused by the increasing consumption of fossil fuels,development and utilization of new energy become the development direction of future energy society.Hydrogen energy,as an efficient,clean and abundant source of secondary energy,is considered to be one of the ideal energy of human beings in the future.However,the safe and efficient storage and transfer of hydrogen is a challenge because of its low volumetric and weight energy densities.To solve these challenging problems,discovering chemical hydrogen?H2?storage materials that can store and generate H2 in a safe and efficient way has attracted much research interest to transform the present fossil fuel economy to a H2 economy.Among them,hydrous hydrazine,which possesses high hydrogen content?8 wt %?,easy recharging as a liquid,can be stored and transferred safely.Importantly,the production from complete decomposition of hydrous hydrazine is only hydrogen in addition to nitrogen,without any other solid byproduct.In this thesis,the main result is to develop a nanocatalystic that can complete the decomposition reaction of hydrous hydride efficiently at moderate conditions.Experiment use a simple total reduction method to fix Ni,Pt nanoparticles on the modification of g-C₃N₄ carrier with Li Cl,hydrazine hydrate decomposition in alkaline condition.The results show that the hydrazine hydrate dehydrogenation in Ni₆Pt₄ /g-C₃N₄ Nanosheets catalyst under the action of catalytic performance is best,hydrazine hydrate decomposition under the condition of 50 ° C,120 mg NaOH 1.5min can be fully reflect.The H2 selectivity can be as high as 100 %.So catalyst Ni₆Pt₄/ g-C₃N₄ Nanosheets has superior catalytic performance.On the basis of the catalyst we made further improvement,with the results showed that Mn?NO₃?₂ solution was added into g-C₃N₄ Nanosheets carrier for further modification,the mass fraction of 50 % Mn?NO₃?₂ solution of 2.5 ml,Ni,Pt metal load ratio of 4:6,preparation of Ni4Pt6/MnO_x-g-C₃N₄ Nanosheets catalyst performance is best.The catalyst hydrazine hydrate in 50 °C,120 mg NaOH cases completely decomposed need time was 1.2 min,H2 selectivity can be as high as100 %,compared with Ni₆Pt₄ / g-C₃N₄ Nanosheets catalyst,the catalytic performance is better,it has the very good application prospect.