Study On The Performance Of Modified Molecular Sieve To Remove SO₂ From Flue Gas

The continuous advancement of industrial technology,the rapid development of the thermal power industry,and the continuous improvement of transportation are all inseparable from the consumption of energy,which is accompanied by an increase in coal consumption and an increase in SO2 emissions,which endanger human health and cause global The environmental pollution within the scope has brought huge economic losses to the whole world.There are many methods to deal with SO2 at present.The removal of SO2 by adsorption method is one of them.When this method is used,no water is added,which will not cause equipment corrosion and no secondary pollutants.However,the adsorbents used in industry at this stage have the problems of small adsorption capacity,low desulfurization efficiency,poor thermal stability,and high price.At present,it is urgent to develop an adsorbent with high efficiency,low cost,strong thermal stability and large adsorption capacity.In this paper,by studying the effect of different modification methods on the adsorption performance of molecular sieve,the best modification method is obtained,and the modified molecular sieve with good adsorption performance is selected.Through characterization and data simulation,the structural characteristics and adsorption of molecular sieve adsorption Mechanism,and finally conduct desorption experiments to verify the renewable properties of the material.Studies have shown that the different modification methods have an effect on the adsorption performance of SO2.The specific surface area and pore size of molecular sieves play a vital role in the adsorption of SO2.The adsorption mainly occurs in micropores.For 4A,5A and 13X,at the adsorption temperature of 110?,the unmodified 13X molecular sieve SO2 has the largest penetration adsorption capacity.Roasting causes the crystallization water in the molecular sieve to be lost and the pore size to expand,which is helpful to reduce the diffusion resistance of SO2 inside the molecular sieve and increase the adsorption capacity.However,excessively high temperature will cause the molecular sieve framework to collapse and block the pores.Modification of molecular sieve with NaOH solution changes the internal structure of the molecular sieve.It has been found through experiments that the maximum penetration of 0.5%NaOH modified 13X is 0.7701 mmol/g,but too high a concentration of NaOH solution will severely etch the surface of the molecular sieve and damage it Structure itself.Through experimental comparison,it is found that 13X has the best performance among the three molecular sieves.In the study of 13X loading copper oxide and manganese dioxide with different mass fractions,it is concluded that the loading of metal oxides can enhance the performance of 13X to adsorb SO2,which benefits from the addition of metal oxides to provide more active sites,Increase the Coulomb force of the molecular sieve,the experiment found that the 13X molecular sieve SO2 loaded with 6%mass fraction of manganese dioxide SO2 breakthrough adsorption capacity is 0.8705mmol/g.Kinetic analysis found that the quasi-secondary adsorption kinetic model can better describe the adsorption process of SO2 on the modified 13X molecular sieve.Desorption experiments prove that the modified material can be recycled and reused.