Separation and capture technology for small molecules is of great significance,including for the goal of adsorbing and separating CO2.Accurately controlling the pore size to achieve separation of molecules with simila...Separation and capture technology for small molecules is of great significance,including for the goal of adsorbing and separating CO2.Accurately controlling the pore size to achieve separation of molecules with similar sizes remains a challenging task in rigid porous materials,such as inorganic zeolites.We propose precise pore size engineering of“larger pore”faujasite(FAU)zeolite by depositing carbon atoms inside its framework.Low-dose electron microscopy with high spatial resolution is used to visualize the carbon deposition process and the corresponding evolution of pore size.Pore size changes as a function of carbon deposition time are also studied by gas adsorption using N_(2).The carbon-modulated FAU samples with optimized pore sizes exhibit excellent gas separation of CO_(2) relative to other small molecules.For a 50/50 H_(2)/CO_(2) mixture,the separation factor was increased by 31%with a breakthrough time difference over 1200 s/g as compared to the neat FAU.We thus tailor the gas adsorption of FAU through partial filling of pores with deposited carbon and note that this can be generalized for the pore size engineering of many porous materials for use in industrial gas separation applications.展开更多
基金supported by the National Natural Science Foundation of China(Nos.T2322019(B.S.)and 22275133(B.S.))Suzhou Science and Technology Development Plan(No.ZXL2023179(B.S.))+2 种基金Science Foundation of Jiangsu Province(No.BK20220484(B.S.))Suzhou Key Laboratory of Functional Nano&Soft Materials,Collaborative Innovation Center of Suzhou Nano Science&Technologythe 111 Project,Joint International Research Laboratory of Carbon-Based Functional Materials and Devices,and the Institute for Basic Science(IBS-R019-D1)of Republic of Korea.
文摘Separation and capture technology for small molecules is of great significance,including for the goal of adsorbing and separating CO2.Accurately controlling the pore size to achieve separation of molecules with similar sizes remains a challenging task in rigid porous materials,such as inorganic zeolites.We propose precise pore size engineering of“larger pore”faujasite(FAU)zeolite by depositing carbon atoms inside its framework.Low-dose electron microscopy with high spatial resolution is used to visualize the carbon deposition process and the corresponding evolution of pore size.Pore size changes as a function of carbon deposition time are also studied by gas adsorption using N_(2).The carbon-modulated FAU samples with optimized pore sizes exhibit excellent gas separation of CO_(2) relative to other small molecules.For a 50/50 H_(2)/CO_(2) mixture,the separation factor was increased by 31%with a breakthrough time difference over 1200 s/g as compared to the neat FAU.We thus tailor the gas adsorption of FAU through partial filling of pores with deposited carbon and note that this can be generalized for the pore size engineering of many porous materials for use in industrial gas separation applications.
