作　　者： ; ; ; ; ; ;

机构地区： 华南理工大学化学与化工学院传热强化与过程节能教育部重点实验室

出　　处： 《功能材料》 2008年第8期1373-1376,共4页

摘　　要： 主要研究了金属离子交换分子筛对有机硫化物苯并噻吩和二苯并噻吩的吸附。首先通过液相离子交换法对商品的Na(Ⅰ)/Y分子筛进行改性,分别制备了5种过渡金属离子的Y型分子筛Ag(Ⅰ)/Y、Ni(Ⅱ)/Y、Zn(Ⅱ)/Y、Cu(Ⅱ)/Y和Fe(Ⅲ)/Y,用静态吸附法测定了苯并噻吩和二苯并噻吩分别在6种Y型分子筛上的吸附等温线,应用软硬酸碱理论分析和讨论了其吸附能力的差异。结果表明:Na(Ⅰ)/Y对苯并噻吩有吸附,而对二苯并噻吩无吸附作用;Na (Ⅰ)/Y分子筛经离子交换Ag^+、Ni^(2+)、Zn^(2+)、Cu^(2+)、Fe^(3+)后,其吸附苯并噻吩和二苯并噻吩的能力得到了不同程度的提高,其中交换软酸离子的Ag(Ⅰ)/Y其吸附容量增加最多,交换交界酸的Ni(Ⅱ)/Y、Zn(Ⅱ)/ Y、Cu(Ⅱ)/Y次之,而交换硬酸的Fe(Ⅲ)/Y增加最少。这表明,当Na(Ⅰ)/Y分子筛上分别离子交换以上5种软酸性大于Na^+的金属离子时,所得到的改性分子筛其对苯并噻吩和二苯并噻吩的吸附容量均增强。同时,这种吸附能力的大小顺序基本上与这些离子的绝对硬度η成反比。 This work mainly involved the study of the adsorption of Benzothiephene（BT） and Dibenzothiephene （DBT） on different metal ion-exchanged zeolites. Five kinds of transition metal ion- exchanged zeolites were respectively prepared using the liquid-phase ion-exchange method. The isotherms of BT and DBT on the zeolites were separately measured with static adsorption method. Results indicated that BT can be adsorbed on Na（ Ⅰ ）/ Y,hut there were no DBT adsorbed on Na（ Ⅰ ）/Y. Moreover, exchanging Ag^＋ , Ni^2＋ , Zn^2＋ , Cu^2＋ or Fe^3＋ ion with Na（ Ⅰ ）/Y improved its adsorption of benzothiophene and dibenzothiophene in comparison with the original Na（ Ⅰ）/Y. The adsorption capacities of Ag（ Ⅰ ）/Y toward BT and DBT were the highest due to Ag^＋ being soft acid,those of Ni（ Ⅱ ）/Y,Zn（ Ⅱ）/Y and Cu（ Ⅱ ）/Y were in the next place due to Ni^2＋ ,Zn^2＋ and Cu^2＋ being borderline acid,and those of Fe（ Ⅲ ）/Y and Na（ Ⅰ ）/Y were in the lowest due to their being hard acid. It was also found that the adsorption capacity of metal ion-exchanged zeolites was basically inversely proportional to hardness of the ions exchanged with zeolite surfaces.

关 键 词： 分子筛 金属离子 吸附等温线 苯并噻吩 二苯并噻吩 软硬酸碱理论

领　　域： [化学工程]