摘要：

采用浸渍方法将四乙烯五胺（TEPA）负载到KIT-6介孔硅材料孔道表面上合成超枝化固体胺KIT-6(TEPA)，并对其吸附CO₂性能进行研究。结果表明，随着温度的升高，KIT-6(TEPA)的CO₂吸附量呈增长趋势，343 K时获得最大吸附量（3.1 mmol·g^-1）。继续升高温度吸附量则呈下降趋势。KIT-6(TEPA)吸附CO₂过程以化学吸附为主，化学吸附量占总吸附量的97.2%以上（323

Abstract:

Hyperbranched solid amine was prepared with KIT-6 type mesoporous silica, which was modified by tetraethylenepentamine (TEPA)using post-synthetic impregnation.The adsorption behavior of CO₂ on KIT-6(TEPA)was investigated using an adsorption column.The adsorption capacity of KIT-6(TEPA)for CO₂ increased with temperature at 303—343 K, but decreased as temperature increased at 343—353 K.The maximum adsorption capacity is 3.1 mmol·g^-1 at 343 K. The mechanism of CO₂ adsorption on KIT-6(TEPA)is mainly chemical adsorption.The adsorption capacity is improved by moisture.It reaches 3.5 mmol·g^-1 in the presence of 12% water.The adsorption capacity is maintained after 20 cycles of adsorption and regeneration, indicating that the KIT-6(TEPA)is stable in a prolonged cyclic operation.Experimental breakthrough curves are fitted with a deactivation model, giving good agreement with experimental data.