Abstract
In this study, the preparation by grafting of amino-functionalized SBA-15 molecular sieves was carried out. Amino-functionalized molecular sieves were synthesized using a silane coupling agent and different types of amination reagents which react with modified SBA-15. These composites were characterized by FT-IR spectroscopy, X-ray diffraction at low angles, nitrogen physisorption at 77 K, and evaluated by the adsorption of CO2 and its temperature-programmed desorption—TPD. Thermal stability was investigated by TGA and DTA methods. In the view of a possible use of these amino-functionalized molecular sieves as sorbents for CO2 removal, their adsorption–desorption properties towards CO2 were also investigated by the TPD method. The mass loss of amino-functionalized molecular sieves above 215 °C was due to the oxidation and decomposition of amino propyl functional groups. This means that these composites could be used for adsorption of CO2 at temperatures below 215 °C. The adsorption of CO2 and its temperature programmed desorption using thermogravimetry were studied for amino-functionalized molecular sieves at 60 °C. The evolved gases during the adsorption–desorption of CO2 on amino-functionalized molecular sieves were identified by online mass spectrometry coupled with thermogravimetry. CO2 adsorption isotherms of functionalized samples at 60 °C showed that both the adsorption capacity (mg CO2/g adsorbent) and the efficiency of amino groups (mol CO2/mol NH2) depend on the type of amination reagents and the amount of organic compound used.
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Acknowledgements
These investigations were partially financed by Romanian Academy Project No. 4.3 and through the Partnerships in priority areas—PN II Romania program, developed with the support of The Ministry of National Education—UEFISCDI, Project No. PN-II-PT-PCCA-2013-4-1708.
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Popa, A., Sasca, V., Verdes, O. et al. Effect of the amine type on thermal stability of modified mesoporous silica used for CO2 adsorption. J Therm Anal Calorim 134, 269–279 (2018). https://doi.org/10.1007/s10973-018-7457-7
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DOI: https://doi.org/10.1007/s10973-018-7457-7