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在323.15,K下,以月桂酸为结构导向剂(SDA)、γ-氨丙基三乙氧基硅烷为助结构导向剂和硅酸乙酯为硅源,采用阴离子表面活性剂法直接合成氨改性介孔SiO2(AMS)用于CO2/N2变压吸附分离.对样品进行低温N2吸附脱附、X射线衍射(XRD)和透射电镜(TEM)表征,然后用动态法测量其CO2、N2穿透曲线并计算吸附量.结果发现,在323.15,K、常压下合成吸附剂AMS对CO2/N2的吸附量分别为0.60,mmol/g和0.03,mmol/g.采用抽真空的方法对吸附剂进行再生,发现75%以上的吸附态CO2能够解吸,经过多次吸附/解吸循环CO2吸附特性不变.同时利用Aspen adsim软件对吸附过程进行模拟,模拟结果与实验数据吻合良好.
At 323.15 K, lauric acid was used as the structure-directing agent (SDA), γ-aminopropyl triethoxysilane as co-structure directing agent and ethyl silicate as silicon source. The anionic surfactant was used to directly synthesize ammonia The mesoporous SiO2 (AMS) was used for CO2 / N2 pressure swing adsorption separation.The samples were characterized by N2 adsorption and desorption, X-ray diffraction (XRD) and transmission electron microscopy (TEM) The results showed that the adsorption capacity of AMS to CO2 / N2 was 0.60, mmol / g and 0.03, mmol / g at 323.15, K and atmospheric pressure, respectively. The results showed that more than 75% of adsorbed CO 2 could be desorbed, and the adsorption characteristics of CO 2 remained unchanged after multiple adsorption / desorption cycles. Simultaneously, the adsorption process was simulated by Aspen adsim software. The simulation results were in good agreement with the experimental data.