Construction and desulfurization performance of Fe-Mn desulfurization sorbents based on modified polyacrylonitrile nanofibers
Polyacrylonitrile(PAN)nanofibers exhibit low adsorption capacities for metal ions,resulting in poor desulfurization performance of the prepared desulfurization sorbents.Polyvinylpyrrolidone(PVP)and hydroxylamine hydrochloride(HAC)were selected to modify PAN nanofibers.Through electrospinning and surface modification,modified support precursors were obtained,and subsequently,Fe-Mn bimetallic desulfurization sorbents were prepared via impregnation and heat treatment.The effects of PVP addition,HAC modification temperature and metal salt concentration on the structure and performance of the desulfurization sorbents were investigated.SEM analysis indicates that both PVP and HAC modifications can obtain desulfurization sorbents with good fibrous morphologies and the active components have good dispersion on the fiber surface.TEM and XPS analysis confirms the successful loading of Fe2O3 and MnO2 on the fiber surface.XRD analysis reveals the formation of Fe7S8 after desulfurization.Textural property analysis demonstrates a significant increase in the specific surface area of the modified desulfurization sorbents.The unmodified desulfurization sorbent exhibits a specific surface area of 5.91 m²/g,while the modified desulfurization sorbent reaches a maximum of 8.10 m²/g(PVP modification)and 14.23 m²/g(HAC modification).ICP-OES analysis shows that the modification significantly enhances the loading(mass fraction)of active components,increasing from 0.93%to a maximum of 22.65%(PVP modification)and 30.97%(HAC modification).Desulfurization performance tests indicate that the breakthrough sulfur capacity(measured as the mass of hydrogen sulfide removed per 100 g of desulfurization sorbent)increases from 0.75 g to a maximum of 4.72 g(PVP modification)and 6.70 g(HAC modification),respectively.
coal gas desulfurizationelectrospinningcarbon nanofibersFe-Mn desulfurization sorbentmodification
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