Preparation Of Porous Carbon Material By Waste Tire Leavening Strategy And Their Study On Adsorption Desulfurization Performance

In recent decades,the number of gasoline vehicles has increased year by year.There are a large number of tires of waste cars in the world.Waste tires have high thermal stability and poor biodegradability.At the same time,they also occupy land,spread diseases,cause environmental problems such as fire,and seriously endanger environmental sanitation and human life.The recycling of waste tires is a very realistic topic.The increase in car ownership will also cause another more serious problem,which is car exhaust emissions.The emissions it exhausted had caused more and more tricky environmental problems.Sulfur compounds in gasoline can generate sulfur oxides after the gasoline was burned,and the emissions in the atmosphere will cause atmospheric pollution,such as acid rain.Sulfur oxides also pose a great threat to people's health.Therefore,the demand for clean gasoline is increasingly urgent.To get clean gasoline,the removal of sulfur compounds in gasoline is particularly important.At present,the most traditional desulfurization method is hydrodesulfurization,but its energy consumption is large.Simultaneously,it consumes hydrogen,destroy the octane number of gasoline and reduce the violent combustion resistance of gasoline.Therefore,it is urgent to find a new non-hydrodesulfurization method.At present,the adsorption desulfurization technology based on the adsorption process has attracted widespread attention from scientific researchers.Compared with hydrodesulfurization,this method can remove sulfur compounds in gasoline at normal temperature and pressure.Therefore,this article mainly uses the fermentation of waste rubber tire to prepare porous carbon material as an adsorbent,and configures model gasoline for carbon material adsorption desulfurization experiments.This not only solves the problem of regeneration of waste tires,but also provides ideas for removing sulfur compounds from gasoline.The effects of specific surface area and surface properties on the adsorption and removal of mercaptan sulfides are systematically investigated.At the same time,SEM,XPS,FT-IR,Raman,N₂ adsorption-desorption and elemental analysis techniques were used to characterize the structure and physical and chemical properties of porous carbon materials.The research content is as follows:?1?Using waste rubber tire particles as the carbon source,add a certain mass ratio of NaHCO₃ and mix grinding with the waste rubber tire particles before calcination.The porous carbon material was obtained after one-step calcination.It can be seen from the SEM image and N₂ adsorption-desorption that the pore structure of the porous carbon material prepared by the fermentation method has increased,and the increase in the pore structure of the adsorption experiment will increase the carbon material's adsorption performance.Compared with the carbon material calcined without adding NaHCO₃,the specific surface area increased by more than three times,and the pore structure increased significantly.In the removal experiment of pentyl mercaptan,the material can achieve ultra-deep removal of pentanethiol in 3 h,and the removal rate reaches 99.7%,however,the removal rate of pentanethiol by directly calcined carbon material is only 23.8%.It also has a good effect on the removal of n-butanethiol,with a removal rate of 96.3%.?2?On the basis of the porous carbon material prepared by the NaHCO₃fermentation method,?NH₄?₂C₂O₄ was added before calcination,and a porous carbon material doped N was obtained after one-step calcination.Compared with the carbon material calcined by pure waste tire particles,the specific surface area of the porous carbon material can get 126.2 m²/g,which increased four times after doping N.XPS and elemental analysis results showed that the addition of?NH₄?₂C₂O₄ will successfully introduce N atoms,and N atoms are in the form of pyridine N,pyrrole N,or graphite N.The introduction of N atoms increases the electronegativity of carbon materials and improves adsorption performance of porous carbon materials.In the experiment of adsorption of 1-pentanethiol,the porous carbon material was capable of ultra-deep removal of pentyl mercaptan?72 ppm?,and the removal rate reached 99.9%within three hours.In the 1-pentanethiol model oil experiment with a higher initial sulfur concentration,the maximum adsorption capacity of the porous carbon material can reach 17.2 mg/g.