SBA-15 was selected as a support and modified with a mixture of tetraethylenepentamine (TEPA) and imidazole (Im) by impregnation method to prepare CO₂ solid adsorbents. The Response Surface Methodology (RSM) based on Central Composite Design (CCD) was used to evaluate and optimize the effect of Im, TEPA loading and adsorption temperature as independent variables on the CO₂ adsorption capacity as the response function. A good agreement between the model prediction and experimental results. The adsorbents were characterized by BET, XRD, FT-IR, TG, TEM and elemental analysis. The introduction of Im improved the adsorption capacity and thermal stability of the adsorbents, but did not change the structure of SBA-15. This is mainly because that the CO₂-C₃H₄N₂ complex formed by Im and CO₂ reaction can effectively improve the adsorption efficiency of the adsorbent. SBA-15-39.5% TEPA-22% Im showed the highest adsorption energy by density functional theory (DFT) calculation, -39.82 kJ/mol. SBA-15-39.5% TEPA-22% Im obtained the highest CO₂ adsorption capacity of 4.27 mmol/g in 15 vol.% CO₂ at 50 ℃. After 10 cycles, CO₂ uptake remained relatively stable at 4.07 mmol/g.

选择SBA-15作为载体，并通过浸渍法用四亚乙基五胺（TEPA）和咪唑（Im）的混合物进行改性以制备CO ₂固体吸附剂。基于中央复合设计（CCD）的响应表面方法（RSM）用于评估和优化作为独立变量的Im，TEPA负载量和吸附温度对作为响应函数的CO ₂吸附容量的影响。模型预测与实验结果之间有很好的一致性。通过BET，XRD，FT-IR，TG，TEM和元素分析对吸附剂进行表征。Im的引入提高了吸附剂的吸附能力和热稳定性，但并未改变SBA-15的结构。这主要是因为CO ₂ -C通过Im和CO ₂反应形成的₃ H ₄ N ₂络合物可以有效地提高吸附剂的吸附效率。根据密度泛函理论（DFT）计算，SBA-15-39.5％TEPA-22％Im显示出最高的吸附能，为-39.82 kJ / mol。在50℃下，SBA-15-39.5％TEPA-22％Im在15 vol。％CO ₂中的最高CO ₂吸附容量为4.27 mmol / g 。10个循环后，CO ₂吸收保持相对稳定在4.07mmol / g。