Preparation Based On Cheap Activated Carbon And Study On Hydrogen Storage Performance At Room Temperature

Hydrogen energy is a kind of secondary energy with rich sources,green and low carbon.However,the storage and transportation of hydrogen energy limits the large-scale development of hydrogen energy.In the research of hydrogen storage materials,carbon based hydrogen storage materials have the advantages of low cost,high safety,light weight and good cycling performance,and become a hot spot in the research of hydrogen storage materials.However,at present,the hydrogen storage capacity of activated carbon materials is low at room temperature.In this paper,high-performance activated carbon was successfully prepared based on a variety of cheap carbon materials,and then the hydrogen storage adsorption test was carried out at room temperature.The development and forming mechanism of pore structure of activated carbon is explored,various factors affecting hydrogen storage of activated carbon at room temperature are summarized and analyzed,and the adsorption mechanism of activated carbon is revealed.The main research contents of this paper are as follows:(1)Based on the low-rank coal represented by Zhundong coal,the acid pretreatment demineralization method was developed,and then high-performance activated carbon was prepared through the processes of activation,carbonization and post-treatment.During the process,metal loading was carried out to explore the catalytic activation of Fe,Mg and Ca.And explore the influence mechanism of various activation factors and carbonization factors on activated carbon.The prepared sample ZD-HK3-AC has a specific surface area of 1980m2/g,a micropore volume of 0.5cm3/g,and a mass hydrogen storage density of 1.26wt%at room temperature.The adsorption and desorption curves almost overlap,and the cycle performance is good.The amount of hydrogen is much higher than that of commercial coal-based activated carbon.(2)Develop and utilize microbial fermentation treatment method,using cheap agricultural waste rice husk as raw material,to prepare high-performance activated carbon through high temperature infiltration activation method.The effect mechanism of fermentation time,temperature and urea content on rice husk was explored.The mechanism of fermentation and osmotic activation on silicon in rice husk was analyzed.The specific surface area of the sample DFRO1-AC is 2270m2/g,and the weight hydrogen storage density is 1.21wt%.(3)Development and utilization of instantaneous puffing technology,using cheap aged rice as raw material,through the steps of pre-carbonization,activation and carbonization,successfully prepared high-performance activated carbon.In the process,the influence mechanism of puffing pressure and moisture content of raw materials on popcorn was explored.Finally,the volume of the rice was expanded to 13 times its original size,and the surface was relatively complete.The prepared sample rPK3-AC has a specific surface area of 1759 m2/g,a micropore volume of 0.63 cm3/g,and a weight hydrogen storage density of 1.14 wt%.(4)Finally,various factors affecting the adsorption and storage of hydrogen by activated carbon at room temperature were revealed,and it was found that the hydrogen storage density of activated carbon at room temperature was closely related to Vmin,Sbet,and Smin,indicating that the adsorption process at room temperature was not only monolayer adsorption,but mesoporous adsorption.and micropores also participate in the adsorption and storage of hydrogen.To sum up,based on a variety of cheap raw materials,this paper developed different preparation methods,and successfully prepared high-performance activated carbon,showing a high hydrogen storage capacity at room temperature.Finally,the formation mechanism of pore structure of activated carbon is explored,and various factors affecting the mass hydrogen storage density of activated carbon are analyzed,which provides certain guiding significance for the preparation and research of activated carbon hydrogen storage materials.