银改性NaY分子筛吸附脱除天然气中噻吩的性能研究  

Adsorption removal of thiophene from natural gas by silver modified NaY molecular sieve

作　　者：张青 施宗波 王刚[2] ZHANG Qing;SHI Zongbo;WANG Gang(Rezel Catalysts Co.,Ltd.,Leshan 614800,Sichuan,China;Sichuan University,Chengdu 610065,Sichuan,China)

机构地区：[1]润和催化剂股份有限公司,四川乐山614800 [2]四川大学,四川成都610065

出　　处：《工业催化》2025年第1期45-50,共6页Industrial Catalysis

基　　金：四川省重大科技专项项目(2019ZDZX0025);四川省科技成果转移转化示范项目(2022ZYCG001);四川省科技成果转移转化示范项目(24ZHSF0549)。

摘　　要：采用硝酸银溶液对NaY分子筛进行离子交换改性,以提高其脱除天然气中噻吩的性能,并对改性AgY分子筛吸附剂进行分析表征和评价实验,考察了Ag含量对分子筛结构、晶相及脱除噻吩性能的影响。结果表明,经硝酸银改性得到的AgY分子筛比表面积和孔容均有所降低,但分子筛骨架结构保持良好,未被破坏。随着离子交换液浓度的增大,分子筛中的Ag含量逐渐增加,当离子交换液浓度为0.20 mol·L^(-1)时,分子筛中的Ag 2 O含量为18.28%(质量分数),Ag^(+)与Na^(+)的离子交换选择性系数为16.2。吸附脱除噻吩评价实验结果表明,随着分子筛中Ag^(+)含量的增加,吸附剂吸附噻吩的穿透时间逐渐增加,穿透硫容逐渐增大,但增加趋势逐渐变缓,当离子交换液浓度为0.20 mol·L^(-1)时,AgY分子筛吸附脱除噻吩的性能最好,噻吩穿透时间达到183 h,穿透硫容为1.32%(质量分数)。NaY molecular sieve was modified with silver nitrate solution to improve the performance of AgY adsorbent for thiophene removal from natural gas.The effects of Ag content on the structure of AgY,crystal phase and the removal of thiophene were studied by characterization and evaluation of adsorbents.The results showed that the surface area and pore volume of AgY molecular sieve modified by silver nitrate were decreased,but the molecular sieve skeleton structure was not destroyed.With the increase of the concentration of ion exchange solution,the Ag content in the molecular sieve gradually increased.When the concentration of ion exchange solution was 0.2 mol·L^(-1),the mass fraction of Ag_(2)O in the molecular sieve was 18.25%,and the ion exchange selectivity coefficient between Ag^(+)and Na^(+)was 16.2.The results of thiophene removal evaluation showed that with the increase of Ag^(+)content in the molecular sieve,the breakthrough time of thiophene gradually increased,and the breakthrough sulfur capacity gradually increased,but the increasing trend gradually became slow.When the concentration of ion-exchange solution was 0.2 mol·L^(-1),AgY molecular sieve had the best performance with breakthrough time of 183 h and breakthrough sulfur capacity of 1.32%(mass fraction).

关 键 词：催化化学 吸附剂 金属改性 AgY分子筛 深度脱除 噻吩 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]