CuY型分子筛制备及吸附脱硫影响因素研究

通过液相离子交换法制备CuY型分子筛,并利用正交实验得到了制备过程中交换时间、交换温度、铜离子浓度的最佳条件。系统研究了CuY分子筛的焙烧温度、吸附时间、吸附温度对其吸附脱除模拟油中二苯并噻吩(DBT)的影响。采用XRD、ICP及BET比表面积分别对不同CuY分子筛的骨架结构及阳离子负载量进行了研究。结果表明,二次交换后,分子筛已达到交换平衡,最佳焙烧温度为450℃,温度过高会破坏分子筛的骨架结构;分子筛上的吸附水对其吸附脱除二苯并噻吩的能力有较大的影响。

EFFECT OF DIFFERENT FACTORS ON ADSORPTION OF SULFUR-CONTAINING COMPOUNDS OVER CuY ZEOLITES

CuY zeolites were prepared from NaY zeolites using liquid-phase ion-exchange method.The optimal exchange conditions of exchange time,exchange temperature and concentration of copper ions were obtained by the orthogonal experimental design.The effects of CuY zeolite calcination temperature,adsorption time,adsorption temperature,and moisture content on the remove of DBT in model fuel were also investigated systematically by static method.XRD,ICP and BET were used respectively to investigate the structure and the Cu-loadings of the sorbents.The results showed that sodium ions exchange extent was attained balanced after two times of ion exchange;the optimal calcination temperature was around 450℃,excessive high calcination temperature resulted in collapse of the zeolite structure;moisture in the zeolite had remarkable influence on DBT adsorbing properties on CuY zeolites.