Investigation Of The Adsorption Performance Of CO₂ With MEA And DEA Modified SBA-15 By Impregnation Method

As the problem of greenhouse gas emissions is getting more and more attention,countries all over the world have proposed measures such as energy conservation and emission reduction. Furthermore, various new technologies about carbon capture have been put forward and applied. Mesoporous materials have broad application prospects in the fields of adsorption, catalysis and separation because of their moderate aperture,large specific surface area, high thermal stability and hydrothermal stability. It has been pointed out that advanced materials especially mesoporous materials as the main body for carbon capture has became an advanced research hotspot in the future, which provides references to explore new methods for CO₂ capture. In this paper, a new mesoporous material named SBA-15 is used as the carrier, the organic amine MEA,DEA and MDEA as loaded reagent, the organic amine was immersed into the SBA-15 channel by impregnation to enhance the CO₂ absorption capacity of the material.Methods of X ray diffraction?XRD?, thermal gravimetric analysis?TGA?, low temperature N₂ adsorption/desorption, and transmission electron microscopy?TEM?were used to characterize the adsorption materials by detecting changes in the adsorbent material before and after modification. To estimate the impregnation amount of organic amine in the mesoporous materials and analyze the relationship between the structure of the adsorption material and the amount of the impregnation,the internal structure of the adsorption material has been measured. The results showed that when the impregnation quantity of the SBA-15 is low, the structure of the modified SBA-15 retains the original pore structure of SBA-15, while the pore size and pore volume decreases gradually with the increase of impregnation quantity. The pore structure of the material is destroyed when the quantity of the impregnation exceeds a certain value.MEA, DEA and MDEA were used to modify the mesoporous material SBA-15 by impregnation method. The CO₂ adsorption capacity of the modified SBA-15 has been significantly improved and the adsorption capacity of the SBA-15 modified by DEA is better than that of MEA. The adsorption properties of the material decreased with the increase of the temperature, and the maximum adsorption capacity occurred at30?. The maximum adsorption capacity of MEA-SBA-15?1:1? was 42.5mg/g, and the maximum adsorption capacity of DEA-SBA-15?2:1? was 154.5mg/g. Therelationship between the CO₂ adsorption capacity of the material and the impregnation quantity is not directly proportional. With the increase of the impregnation quantity, the adsorption capacity of CO₂ increased firstly and then decreased. The adsorption capacity of the mesoporous material SBA-15 before and after modified is in the order of < MEA-SBA-15?0.5:1? < MEA-SBA-15?2:1? <MEA-SBA-15?1:1? < DEA-SBA-15?0.5:1? < DEA- SBA-15?1:1? < DEASBA-15?3:1? < DEA- SBA-15?2:1?.