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将乙二胺(EDA,60 g/mol)、四乙烯五胺(TEPA,189 g/mol)和两种聚乙烯亚胺600(PEI600g/mol;PEI1800g/mol)分别负载在MCM-41上制备氨基功能化介孔材料,研究其对CO2的吸附性能和热稳定性。结果表明,除了EDA-MCM41,其他三种材料随着胺分子量增大CO2吸附性能下降,但是热稳定性却有所提高,其中,TEPA-MCM41的吸附容量最大,达到2.7 mmol/g。同时发现,乙二胺在制备过程中随溶剂挥发而难以完全负载在MCM-41上。在纯N2气氛和再生温度100℃条件下,经10次循环实验后,TEPA-MCM41的吸附能力下降了7.4%,而PEI600-MCM41和PEI1800-MCM41吸附能力保持不变,且质量变化在1%以内,表现出良好的再生稳定性。采用80%CO2/20%N2对吸附饱和的材料进行再生,四种材料的再生温度将提高到160℃以上,高分子量PEI600-MCM41和PEI1800-MCM41相比于TEPA-MCM41具有更好的热稳定性。
Ethylenediamine (EDA, 60 g / mol), tetraethylenepentamine (TEPA, 189 g / mol) and two polyethylenimine 600 (PEI 600 g / mol; PEI 1800 g / mol) were separately loaded on MCM-41 Amino-functionalized mesoporous materials to study their CO2 adsorption properties and thermal stability. The results showed that with the exception of EDA-MCM41, the adsorption capacity of CO2 decreased with the increase of molecular weight, but the thermal stability increased with the increase of molecular weight. Among them, TEPA-MCM41 had the highest adsorption capacity of 2.7 mmol / g. At the same time, it was found that ethylenediamine was difficult to be fully loaded on MCM-41 with the volatilization of solvent during the preparation process. The adsorption capacity of TEPA-MCM41 decreased by 7.4% after 10 cycles under pure N2 atmosphere and regeneration temperature of 100 ℃, while the adsorption capacity of PEI600-MCM41 and PEI1800-MCM41 remained unchanged at 1% Within, showing a good stability of the regeneration. Adsorption of saturated materials with 80% CO2 / 20% N2 regenerated the temperature of the four materials above 160 ° C and the high molecular weight PEI600-MCM41 and PEI1800-MCM41 have better thermal stability than TEPA-MCM41 Sex.