首页|3D printing of poly(ethyleneimine)-functionalized Mg-Al mixed metal oxide monoliths for direct air capture of CO2
3D printing of poly(ethyleneimine)-functionalized Mg-Al mixed metal oxide monoliths for direct air capture of CO2
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Direct air capture(DAC)of CO2 plays an indispensable role in achieving carbon-neutral goals as one of the key negative emission technologies.Since large air flows are required to capture the ultradilute CO2 from the air,lab-synthesized adsorbents in powder form may cause unacceptable gas pressure drops and poor heat and mass transfer efficiencies.A structured adsorbent is essential for the implementation of gas-solid contactors for cost-and energy-efficient DAC systems.In this study,efficient adsorbent poly(ethy-leneimine)(PEI)-functionalized Mg-AI-CO3 layered double hydroxide(LDH)-derived mixed metal oxides(MMOs)are three-dimensional(3D)printed into monoliths for the first time with more than 90％adsor-bent loadings.The printing process has been optimized by initially printing the LDH powder into mono-liths followed by calcination into MMO monoliths.This structure exhibits a 32.7％higher specific surface area and a 46.1％higher pore volume,as compared to the direct printing of the MMO powder into a monolith.After impregnation of PEI,the monolith demonstrates a large adsorption capacity(1.82 mmol/g)and fast kinetics(0.7 mmol/g/h)using a CO2 feed gas at 400 ppm at 25 ℃,one of the high-est values among the shaped DAC adsorbents.Smearing of the amino-polymers during the post-printing process affects the diffusion of CO2,resulting in slower adsorption kinetics of pre-impregnation mono-liths compared to post-impregnation monoliths.The optimal PEI/MeOH ratio for the post-impregnation solution prevents pores clogging that would affect both adsorption capacity and kinetics.
3D printingMixed metal oxidesAmine functionalizationStructured adsorbentDirect air capture
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