SBA-15分子筛改性及其对噻吩的吸附脱除  

Modification of SBA-15 Zeolite by Acid and Metal Ions and Its Adsorptive Behavior for Thiophene

作　　者：鲍磊[1] 廖俊杰[1] 陈艳珍[1] 曹青[1] 鲍卫仁[1] 

机构地区：[1]太原理工大学煤科学与技术省部共建国家重点实验室培育基地,太原030024

出　　处：《太原理工大学学报》2014年第3期319-323,共5页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(51372161);地方高校国家级大学生创新创业训练计划项目(201210112003);山西省高等学校大学生创新创业训练项目(2012039)

摘　　要：汽油中硫化物的深度脱除是满足越来越严格的汽车尾气排放标准的前提。选取硅、铝摩尔比n(Si)/n(Al)分别为8,16,34,60的SBA-15分子筛为研究对象进行H+改性,制得HSBA-15类型的吸附剂。考察不同n(Si)/n(Al)的吸附剂的脱硫性能及其N2吸附、XRD、NH3-TPD结构特性,结果表明,硅、铝摩尔比与吸附剂的孔结构密切相关,H+改性通过调节吸附剂的总酸量影响其脱硫活性;硅、铝摩尔比为16的吸附剂总酸量最大,脱硫活性最佳。Cu、Ce、La离子改性制得的吸附剂脱硫活性结果表明,三种金属离子均能明显提高吸附剂的脱硫活性;LaSBA-15-16吸附剂的脱硫效率最高,在70℃的温度条件下,可将模拟油品中的噻吩脱除至3.0mg/L,对应的脱硫效率和硫容分别为99.22%和3.78mg/g.As the main source of SOx formation, the vehicle emission has caused serious environmental problems. The deep removal of sulfur-containing compounds from fuel oils has become a critical technique to meet the stringent auto emissions standards. In this study, SBA-15 zeolites with different Si,A1 molar ratio of 8, 16, 34 and 60 were selected and then modified by H＋ to prepare the HSBA-15-8, HSBA-15-16, HSBA-15-34 and HSBA-15-60 sorbents, respectively. The static adsorption experiment was carried out in a model gasoline solution to investigate the effect of n（Si）/n（Al） on the desulfurization behavior of sorbent. The N2 adsorption, XRD and NH3- TPD techniques were used to characterize the samples modified by acid. The results show that the n（Si）/n（Al） dominated the pore structure of zeolite and the total acid amount of sorbent prepared, which brought a significant effect on the capacity of thiophene adsorption. Among those sorbents, HSI3A-15-16 sorbent had the largest amount of total acid and thus a good desulfuriza- tion performance. Base on this, HSBA-15-16 was ion-exchanged by copper, cerium and lanthanum ions to prepare the CuSBA-15-16, CeSBA-15-16 and LaSBA-15-16 sorbents, respectively. The effects of metal ions and adsorption temperature on the desulfurization activity were also explored. The results show that those metal ions increased the desulfurization efficiency of the sorbents. The LaSBA-15-16 was the best sorbent, which removed the thiophene in the model gasoline to 3.0 mg/L at 70℃, and the desulfurization efficiency and sulfur capacity were 99.22% and 3.78 mg/g, respectively.

关 键 词：油品 吸附脱硫 SBA-15分子筛 酸改性 金属离子改性 

分 类 号：TQ424.2[化学工程]