Synthesis of novel core-shell structured solid amine adsorbents and their CO2 capture performance
WANG Kaiyue
BAN Hongyan
JIA Qian
AN Mei
LI Guoqiang
LI Congming
LI Lei
Abstract：In recent years,immense attention is attracted by the implementation of amine functionalized solid adsorbents for direct air capture(DAC)of CO2.However,a great reduction of pore volume and specific surface area within the adsorbents is led to by the amine functionalization of traditional supports(such as SBA-15).In the context of DAC,the CO2 adsorption dynamics is significantly limited by the extremely low partial pressure of CO2(400×10-6),thus with lower CO2 adsorption capacity.To address this issue,silica hollow spheres(RHMS-4)with large pore aperture and high structural tunability are prepared by using phenolic resin microspheres as templates and adjusting the mass fraction of tetraethyl orthosilicate(TEOS)with the introduction of a reaming agent.The amine functionalization is achieved by impregnating silica support in tetraethylenepentamine(TEPA)solution.The structure-performance relationship of RHMS-4-TEPA series adsorbents is investigated by XRD,FT-IR,and other characterization techniques.The effect of amine content,adsorption temperature and ambient humidity on the CO2 adsorption capacity are also investigated.The experimental results show that:Under dry condition(50 ℃ and 400×10-6 CO2),the adsorption capacity of RHMS-4-TEPA70 reach to about 2.400 mmol/g,while the CO2 uptake is improved by about 42％with the presence of moisture.After 10 sorption-desorption cycles,relatively high CO2 adsorption capacity and excellent cycling stability are still maintained by RHMS-4-TEPA70.
Keywords：direct air capture(DAC)solid adsorbentsolid aminetetraethylenepentamine(TEPA)breakthrough curve
Publication Date：2025-11-30
Online Publishing Date：2025-12-24(First online date of this platform, not the publication date of the document)
Pages：10( 1-10 )