Study On Desulfurization And Regeneration Behavior Of Coal Gas With SBA-15 Loaded Zinc-based Oxides

In 2019,Xi Jinping put forward the ambitious goal of"carbon peak in 2030 and carbon neutrality in 2060".my country needs to accelerate the adjustment and optimization of energy structure and reduce the proportion of coal.However,my country’s national conditions determine that coal will still be the main energy source in the short term.The most important thing is to realize the clean and efficient use of coal.Coal gasification is an important part of the clean and efficient utilization of coal.The gas production will cause corrosion and equipment.The gas containing gas and the oxidation produced by combustion will be discharged into the air to pollute the environment with low carbon,so it is necessary to desulfurate before using the gas.Nowadays,with environmental protection and related reactions（using coal gas as a raw material）for increasing the sulfur content of the raw gas,stricter requirements are put forward for coal gas desulfurizers,and there is an urgent need to develop high-performance coal gas desulfurizers.From theoretical analysis,SBA-15 is used as a desulfurizer carrier.Its large specific surface area is conducive to the diffusion of hydrogen sulfide.The larger pore size can reduce the pore blockage caused by the loading of active components.The thicker pore wall makes it more thermally stable.Sex.At the same time,existing studies have shown that doping additives can improve the dispersibility of zinc oxide,the active component of desulfurization,and adjust the chemical environment where zinc ions are located,thereby affecting the desulfurization reaction activity.Aiming at the problems of low sulfur capacity and difficult regeneration faced by the existing supported zinc-based desulfurizers,this thesis intends to prepare a doped zinc-based desulfurizer and study the feasibility of using SBA-15 as a carrier to improve the structural stability of the zinc-based desulfurizer,On this basis,the study of doping additives（cobalt,nickel）into the zinc-based desulfurizer to modulate the law of desulfurization and regeneration behavior.Through the above research,combined with structural analysis of crystal structure,pore structure,morphology and element distribution,the following main research results are obtained:（1）The doped and adsorption-based desulfurizers,detection agents,and additives added using SBA-15 as the carrier were prepared by the sol method to destroy the structure and ordered mesoporous characteristics of the desulfurizer,but change the electronic surface of the outer layer of the desulfurization atom of the desulfurizer.It can enhance the activity and damage the sulfur and zinc gas.Prevention of desulfurization reaction results,the addition of additives can improve the chemical performance of effective desulfurizers under desulfurization efficiency,and the amount and type of doping additives have different effects on desulfurization performance.Compared with the non-doped additives,when doped with ions and nickel ions that are similar to zinc ions,the use time of the desulfurizer（approximately1.22-1.36 times increase）and the sulfur capacity（approximately 1.27-1.42 times increase）To promote.When doping cerium ions with a larger ion radius,the amount of doping is very important to the vulcanization performance of the desulfurizer.Among a series of desulfurizers,the doping type is nickel,and the desulfurizer(Zn₂₀Ni₁/SBA-15)with a molar ratio of zinc to nickel of 20:1 has the longest breakthrough time（203 min）and the highest sulfur capacity（16%）.In addition,it is worth noting that the experiment also found that the introduction of additives can inhibit the formation of carbonyl sulfide during the use of the desulfurizer.（2）The research on the desulfurization and regeneration behavior of Zn₂₀Ni₁/SBA-15 at different temperatures found that the vulcanization performance of Zn₂₀Ni₁/SBA-15 first increased and then decreased with the increase of the reaction temperature,and the desulfurization performance reached the best at 500℃,and its breakthrough time was 203 min,the breakthrough sulfur capacity is as high as 16%,which is related to the effect of temperature on the reaction rate.The temperature program study found that doping additives can effectively reduce the regeneration temperature of zinc oxide desulfurizer.The results of the regeneration behavior study show that the regeneration performance of Zn₂₀Ni₁/SBA-15 is affected by both the regeneration temperature and the regeneration oxygen concentration.With the increase of the regeneration temperature,the regeneration performance of the desulfurizer first increases and then decreases,and the same trend is also present with the increase of oxygen concentration.The best regeneration conditions are temperature 600℃,oxygen concentration 4%.In addition,the thickness of the pore wall of the desulfurizer increases after doping with the auxiliary agent,which is beneficial to the stability of the structure during the use of the desulfurizer.The results of 5 vulcanization regeneration cycles show that the desulfurizer always maintains a high sulfur capacity in multiple cycles.After multiple regenerations,the original rod-shaped structure and ordered mesoporous characteristics can be restored,and the active components have not been significantly agglomerated,which is consistent with the performance of the zinc-based desulfurizer after doping with additives.