论文部分内容阅读
以13X分子筛为载体,采用液相离子交换法制备了Ag(I)X吸附剂。以噻吩、3-甲基噻吩、2,5-二甲基噻吩为模拟汽油中的含硫化合物,采用固定床吸附装置考察Ag(I)X对模拟汽油中不同噻吩类硫化物的吸附容量及吸附选择性,以及甲苯和环己烯对吸附剂脱硫性能的影响,并对吸附机理进行了分析。结果表明,Ag(I)X吸附剂对模拟汽油中的噻吩类硫化物具有较高的吸附容量和吸附选择性,噻吩、3-甲基噻吩、2,5-二甲基噻吩的穿透硫容分别为0.776、0.859和0.926mg/g,吸附选择性由大到小的顺序为2,5-二甲基噻吩、3-甲基噻吩、噻吩。模拟汽油中甲苯和环己烯的存在,使Ag(I)X吸附剂的总穿透硫容分别降低了61%和34%,表明甲苯比环己烯有更强的竞争吸附作用。π配位机理能用来解释Ag(I)X对不同噻吩类硫化物的吸附性能差异,以及芳烃和烯烃的存在对其吸附噻吩类硫化物性能的影响。
Using 13X molecular sieve as carrier, Ag (I) X adsorbent was prepared by liquid phase ion exchange method. Using thiophene, 3-methylthiophene and 2,5-dimethylthiophene as the sulfur compounds in simulated gasoline, the adsorption capacities of different thiophene sulfides in simulated gasoline by Ag (I) X and Adsorption selectivity, and toluene and cyclohexene adsorbent desulfurization performance, and the adsorption mechanism was analyzed. The results show that Ag (I) X adsorbent has high adsorption capacity and adsorption selectivity for thiophene sulfides in simulated gasoline. Thiophene, 3-methylthiophene and 2,5- The contents of 2, 5-dimethylthiophene, 3-methylthiophene and thiophene were 0.776,0.859 and 0.926mg / g, respectively. The presence of toluene and cyclohexene in the simulated gasoline reduced the total penetrating sulfur capacity of the Ag (I) X adsorbent by 61% and 34%, respectively, indicating stronger competitive adsorption of toluene over cyclohexene. The π-coordinate mechanism can be used to explain the difference in the adsorption properties of different thiophene sulfides by Ag (I) X and the effect of aromatics and olefins on the adsorption properties of thiophenes.