摘要
采用水热法合成介孔材料SBA-15和Al-SBA-15,分别以2种材料为载体,以3 mmol(Ag NO3)/(g载体)等体积浸渍负载,得样品Ag-SBA-15和Ag-Al-SBA-15。通过N2吸附、TEM等表征方法发现,Al的掺杂并未改变SBA-15规整的孔道结构,Ag NO3在2种载体上均出现部分团聚现象,由于Al-SBA-15的亲水性更好,Ag NO3在载体Al-SBA-15上分散更为均匀。BET分析表明,Al-SBA-15比SBA-15具有更大的比表面积,可达752.0 m2/g。等温吸附测试结果显示:SBA-15和Al-SBA-15对乙烯吸附选择性均较差,对乙烯/乙烷的分离比分别为1.25、1.10。2种载体负载Ag NO3后,乙烯吸附量在低压下大幅增大,分离系数显著增加,样品Ag-Al-SBA-15在298 K、0.07 MPa时分离系数高达14.9,Ag-Al-SBA-15的分离效果优于AgSBA-15。
SBA-15 and A1-SBA-15 are prepared by hydrothermal synthesis method and used as carriers. AgNO3 is supported on SBA-15 and A1-SBA-15 by incipient wetness impregnation at the ratio of 3 mmol AgNO3/g carrier, which are named as Ag-SBA-15 and Ag-A1-SBA-15 ,respectively. The N2 adsorption and TEM results indicate that the addition of aluminium do not change the ordered mesoporous structure of SBA-15. AgNO3 reunion phenomenon occurs on both of the two carriers. AgNO3 is dispersed better on A1-SBA-15 compared with SBA-15, because the hydrophilieity of A1- SBA-15 is better. BET analysis displays that A1-SBA-15 has a higher specific surface area （752.0 m2/g）. The isothermal adsorption of ethylene and ethane indicates that both of the SBA-15 and A1-SBA-15 have a poor selectivity of ethylene. Their separation ratio of ethylene and ethane are 1.25 and 1.10, respectively. The adsorption amount of ethylene at lower pressure increases dramatically after loading AgNO3. The separation ratio is improved significantly as well. The separation ratio of Ag-A1-SBA-15 can achieve 14. 9 at 298 K and 0. 07 MPa,which has superior separation effect to that of Ag-SBA- 15.
出处
《现代化工》
CAS
CSCD
北大核心
2015年第5期77-80,82,共5页
Modern Chemical Industry
