银改性介孔碳吸附脱硫

Research of adsorption desulfurization with silver modified mesoporous carbon

以介孔碳(CMK-3)为载体,Ag NO_3为活性组分,制备了银改性介孔碳(Ag/CMK-3)。对CMK-3、Ag/CMK-3和吸附二苯并噻吩(DBT)后的Ag/CMK-3进行了XRD、BET、FTIR、TEM和N_2吸附-脱附表征。实验结果表明,Ag/CMK-3的饱和硫容量和穿透硫容量分别比CMK-3提高了2.6 mg/g和1.6 mg/g。表征结果显示,Ag/CMK-3保持了CMK-3高度有序的介孔结构,银粒子均匀分散在CMK-3孔道中,粒径可控制在2.5 nm左右,表面酸性增强,但比表面积、孔径和孔体积有所降低。CMK-3表面的银粒子和羟基均与DBT存在化学作用,同时DBT在吸附过程中发生开环反应,出现了C—S键断裂。

A silver modified mesoporous carbon（Ag/CMK-3）was prepared with mesoporous carbon（CMK-3）as a carrier and Ag NO_3 as an active component.Characterization of CMK-3,Ag/CMK-3 and the Ag/CMK-3 after the adsorption of dibenzothiophene（DBT）was performed by XRD,FTIR,TEM and N_2 adsorption-desorption.The experimental results showed that compared with the CMK-3,the Ag/CMK-3 was improved in saturated sulfur capacity and breakthrough sulfur capacity by 2.6 mg/g and 1.6 mg/g,respectively.The characterization results showed that the Ag/CMK-3 maintained the highly ordered mesoporous structure of the CMK-3,silver particles were homogeneously dispersed in channels of the CMK-3 and the particle size thereof could be controlled at about 2.5 nm;the surface acidity was increased,and the specific surface area,the pore size and the pore volume were reduced to some extent.Both silver particles and hydroxyl groups on the surface of the CMK-3 had chemical interactions with the DBT.Meanwhile,the ring-opening reaction of the DBT occurred in the process of adsorption,resulting in C—S bond rupture.