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为解决浸渍法制备的负载胺类固体吸附剂的孔道易堵塞进而影响气体传质等问题，以廉价的水玻璃为硅源，以三聚氰胺-甲醛(MF)树脂胶体球为牺牲模板，通过喷雾干燥制得二氧化硅(SiO2)微球，经过煅烧去除牺牲模板后得到带有大孔的SiO2微球，以此微球为载体负载聚乙烯亚胺(PEI)，制得SiO2基负载胺类固体吸附剂。采用SEM、TG、FT-IR、MIP、BET等测试方法表征样品的表面结构和理化性质，并运用固定床吸附柱系统进行CO2吸附-解吸实验，研究胺负载量、吸附温度和进气流量对CO2吸附的影响。结果表明：由40%(质量分数)PEI负载的吸附剂在60℃、50 mL/min的气体流量下有最优的吸附性能，其饱和吸附量为1.82 mmol/g，其吸附行为符合Avrami模型，表明吸附过程中同时存在物理和化学2种吸附行为；经过20次吸附-脱附循环，吸附剂的饱和吸附量仅下降了8.8%，表现出良好的循环再生性能。
Abstract：In order to solve the problem that the pores loaded with amine solid adsorbents prepared by impregnation method are easy to clog and thus affect the mass transfer of gas, using cheap water glass as the silicon source and melamine formaldehyde(MF) resin colloidal spheres as the sacrificial template, silicon dioxide microspheres with large pores are obtained by spray drying, and after the sacrifice template is removed by calcination, then SiO2-supported amine solid adsorbent are prepared by loading polyethylenimine(PEI) on the microsphere. The surface structure and physicochemical properties of the samples are characterized by SEM, TG, FT-IR, MIP,and BET. The CO2 adsorption-desorption experiment is carried out with a fixed bed adsorption column system,and the effects of amine loading, adsorption temperature and intake flow rate on CO2 adsorption are studied. The experimental results show that the adsorbent with 40% PEI loading has the best adsorption performance at 60 ℃ and 50 mL/min gas flow rate, and its saturated adsorption capacity is 1.82 mmol/g. Its adsorption behavior conforms to the Avrami model, indicating that both physical and chemical adsorption processes exist simultaneously during the adsorption. After 20 sorption-desorption cycles, the saturated adsorption capacity of the adsorbent only decreases by 8.8%, showing good recycling performance.
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基本信息:
中图分类号:X701;TQ424
引用信息:
[1]侯彦辉,张凤仪,赵港国,等.球形大孔SiO_2基CO_2吸附剂的制备及性能分析[J].天津工业大学学报,2025,44(06):31-39.
基金信息:
国家自然科学基金项目(52373118)
2025-12-25
2025-12-25