载金属离子的13X分子筛对噻吩的吸附性能研究

Study on adsorption properties of thiophene on 13X loaded with metallic ions

采用Zn2+,Cu2+,N i2+,Ag+分别负载到13X分子筛制得吸附剂,考察了它们对噻吩的吸附能力,发现Ag+-13X吸附效果最好,与软硬酸碱理论解释的结果一致。测定了噻吩在Ag+-13X上的吸附动力学数据,并测定了其不同温度下的吸附平衡数据,采用Langmu ir模型进行拟合,与平衡数据吻合得很好,说明Langmu ir模型能够描述本体系的特征,从微观上探讨了其吸附机理,是分子尺寸和化学键的共同作用;考察了Ag+-13X对真实汽油的脱硫性能,结果表明对汽油中的噻吩类硫化物都有脱除效果,为其工业设计提供基础数据。

The adsorbents were prepared by 13X loaded separately with Zn^2＋, Cu^2＋, Ni^2＋, Ag^＋ Adsorption capacity of thiophene on these adsorbents was investigated. It shows that capacity of thiophene on Ag^＋ -13X is maximal. The result is consistent with explanation of Hard and Soft Acids and Bases （HSAB）. Adsorption kinetics data of thiophene on Ag^＋-13X was measured. Adsorption equilibrium data of thiophene on Ag^＋ -13X at different temperatures was measured and simulated with Langmuir model. The adsorption equilibrium data was in good agreement with the calculated value. The results show that Langmuir adsorption model is suitable for describing characteristics of the system including thiophene and Ag^＋ -13X. The adsorption mechanism from a microscopic view is a synthetical action of the molecular sizes and the chemical bond. Adsorption properties for sulfur removal from actual gasoline on 13X loaded with Ag^＋ was studied, the results indicate that the adsorption effect of 13X loaded with Ag ＋ is apparent, thus providing the fundamental data for industrial design.