孔结构在MgFe_(2)O_(4)改性活性炭脱硫过程中的作用  

Role of pore structure of MgFe_(2)O_(4) modified activated carbon in desulfurization process

作　　者：陈铭 梁晓怿[1] CHEN Ming;LIANG Xiao-yi(School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化工学院,上海200237

出　　处：《现代化工》2024年第9期195-200,207,共7页Modern Chemical Industry

摘　　要：合成了一系列MgFe_(2)O_(4)基改性球形活性炭吸附剂,用于室温下去除加湿空气中的H_(2)S,同时研究了孔隙结构对吸附性能的影响。通过SEM-EDS、氮气吸附-脱附和XRD对材料进行表征。结果表明,样品MFOR2-20对H_(2)S的吸附性能最好,达到204 mg/mL(571 mg/g);脱硫过程中形成的FeOOH作为中间体起到催化作用;产物包括单质硫和硫酸盐。H_(2)S的脱除包括吸附和催化氧化2种方式,H_(2)S的催化氧化一直持续到催化剂的所有有效孔被氧化产物堵塞。较小的孔隙可以增强催化剂的分散性、提供吸附中心并储存氧化产物。A series of MgFe_(2)O_(4)-based modified spherical activated carbon absorbents are synthesized to remove H_(2)S from humidified air at room temperature.The influence of pore structure on adsorption performance is studied.The catalysts are characterized through SEM-EDS,nitrogen adsorption-desorption,and XRD.Results show that MFOR2-20 sample shows the best adsorption performance for H_(2)S,reaching 204 mg·mL^(-1) or 571 mg·g^(-1).FeOOH formed as an intermediate in the desulfurization process plays a catalytic role.Desulfurization products include elemental sulfur and sulfates.Removal of H_(2)S includes two routines:adsorption and catalytic oxidation.Catalytic oxidation of H_(2)S continues until all the effective pores of the catalyst are blocked by the oxidation products.Smaller pores can enhance the dispersion of the catalyst,provide adsorption centers and store oxidation products.

关 键 词：活性炭 H_(2)S吸附 固定床 MgFe_(2)O_(4) 孔隙结构 

分 类 号：X511[环境科学与工程—环境工程]