氨基功能化SBA-16对CO_2的动态吸附特性  

Dynamic Performance of CO_2 Adsorption with Amine-Modified SBA-16

作　　者：史晶金[1] 刘亚敏[1] 陈杰[1] 张瑜[1] 施耀[1] 

机构地区：[1]浙江大学工业生态与环境研究所,杭州310028

出　　处：《物理化学学报》2010年第11期3023-3029,共7页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20976159)~~

摘　　要：采用浸渍法将四乙烯五胺(TEPA)负载到介孔分子筛SBA-16的孔道内,形成功能化的介孔材料用于CO2的吸附.利用X射线衍射(XRD)、透射电镜(TEM)、氮气物理吸附-脱附和热重分析(TGA)等方法对样品进行了表征.通过动态吸附对不同TEPA浸渍量的SBA-16的CO2吸附性能和再生性能进行研究.结果表明:修饰后的SBA-16仍然保持有序的孔道结构,但样品的孔道有序度降低,比表面积、孔容、平均孔径都减小.样品对CO2的饱和吸附容量和穿透吸附容量随着TEPA浸渍量的增加而增加.60℃时,30%TEPA浸渍量的样品的穿透吸附容量和饱和吸附容量达到最大,分别为0.625和0.973mmol·g-1.在60-80℃,样品的动态吸附性能稳定.经过20次吸附-脱附循环后,样品的饱和吸附容量仅降低了6.45%.采用失活模型对CO2的吸附穿透曲线进行模拟,该模型能够很好地模拟样品对CO2的吸附过程.Novel CO2 adsorbents for CO2 removal were prepared by introducing tetraethylenepentamine （TEPA） into SBA-16 type mesoporous silica using a post-synthetic impregnation method. The properties of the mesoporous materials before and after surface modification were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, thermal gravimetric analysis （TGA）, and N2 adsorption-desorption. We confirmed that TEPA was loaded onto the surface of the channels in the mesoporous materials. The surface area, pore size, and pore volume of TEPA-loaded SBA-16 decreased with an increase in TEPA loading while its fundamental pore structure was unchanged. The dynamic adsorption of CO2 onto TEPA-loaded SBA-16 as well as its regeneration property was studied in a packed column. The total adsorption capacity and breakthrough capacity increased when the amount of loaded TEPA increased from 10% to 30% （w）. The sample impregnated with 30% TEPA showed the highest breakthrough capacity and total adsorption capacity of about 0.625 and 0.973 mmol·g-1 at 60 ℃, respectively. From 60 ℃ to 80 ℃, the CO2 dynamic adsorption behavior of TEPA-loaded SBA-16 was stable. The total adsorption capacity of CO2 on TEPA-loaded SBA-16 dropped slightly （6.45%） after 20 adsorption-desorption regeneration cycles. Their CO2 adsorption behavior was also investigated using the deactivation model, which showed an excellent predictive capability for the breakthrough curves.

关 键 词：SBA-16 动态 穿透曲线 失活模型 CO2吸附 

分 类 号：X51[环境科学与工程—环境工程]