离子交换法改性的NaY分子筛对吸附含硫VOCs的性能提升  

Improvement of the adsorption performance of sulfur-containing VOCs by NaY zeolite modified by ion exchange method

作　　者：黄坚 李先锋 谢军[2] 陈瑶姬 邓丽萍 李超群[2] 徐文青[2] HUANG Jian;LI Xianfeng;XIE Jun;CHEN Yaoji;DENG Liping;LI Chaoqun;XU Wenqing(Zhejiang Tiandi Environmental Protection Technology Co.,Ltd,Hangzhou 310013,China;Research Center for Process Pollution Control,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]浙江天地环保科技股份有限公司,杭州310013 [2]中国科学院过程工程研究所,北京100190

出　　处：《环境工程学报》2022年第10期3335-3345,共11页Chinese Journal of Environmental Engineering

基　　金：企业合作项目-焦化行业挥发性有机废气燃烧控制技术与装备开发(ZNKJ-2020-164)。

摘　　要：为解决分子筛在含湿条件下对小分子含硫VOCs吸附性能差的问题,并实现高效捕集,采用液相离子交换法选取不同金属离子(Ag、Cu、Mg、Zn、Ce、Ca等)对NaY和USY-3分子筛进行改性,以二甲基硫醚(DMS)作为模型物,考察2种改性分子筛对高湿度含硫VOCs脱除效果,进而优选性能优异的改性分子筛,再通过多组分VOCs竞争吸附实验来模拟实际应用效果。结果表明,NaY和USY-3分子筛改性后均可保持结构稳定,NaY型分子筛较USY-3分子筛具有更高的离子交换容量,改性后吸附性能提升更明显,CuY、AgY分子筛的DMS吸附性能优异(CuY的穿透吸附量为203 mg·g^(−1),AgY的穿透吸附量为132 mg·g^(−1))。然而,仅有Ag离子交换可提高NaY分子筛的抗水性,在1.5%水蒸气存在时,DMS穿透吸附量最高可达99 mg·g^(−1),且5次循环再生后吸附容量仍在90%。在对二甲苯(PX)存在时,分子筛对2种VOCs的吸附量均高于80 mg·g^(−1),且DMS具有绝对的竞争吸附优势。本研究表明AgY分子筛具有优异的抗水性和吸附选择性,可为其在含湿条件下对VOCs中小分子硫化物的吸附净化应用提供参考。In order to solve the problem of poor adsorption performance of zeolites for small sulfur-containing VOCs under wet conditions and achieve efficient capture,different metal ions(Ag,Cu,Mg,Zn,Ce,Ca,etc.)were selected to modify NaY and USY-3 zeolites by liquid phase ion exchange method.The sulfur-containing VOCs adsorption performance of modified zeolites under aqueous conditions was investigated by using Dimethyl sulfide(DMS)as a model.Furthermore,the ion-modified molecular sieves with excellent performance were used in multi-component VOCs competitive adsorption experiments to test their performance under actual industrial conditions.The results showed that both NaY and USY-3 molecular sieves could maintain structural stability after modification.Compared with USY-3 zeolites,NaY zeolites had higher ion exchange capacity,and the adsorption performance was improved significantly after ion exchange modification.CuY and AgY molecular sieves had excellent DMS adsorption performance(the penetration adsorption of CuY was 203 mg·g^(-1),and that of AgY was 132 mg·g^(-1)).However,only Ag ion exchange improved the water-resistance of NaY molecular sieves.The maximum DMS penetration adsorption capacity of AgY zeolites was 99 mg·g^(-1) in the presence of 1.5%water vapor,and the adsorption capacity decreased by no more than 10%after 5 cycles of regeneration.In the presence of para-xylene(PX),the adsorption capacity of PX and DMS was higher than 80 mg·g^(-1),and DMS had an absolute competitive adsorption advantage.The experimental data showed that AgY molecular sieves had excellent water resistance and adsorption selectivity,and could provide reference to for its application in the adsorption and purification of small molecular sulfides in VOCs under wet conditions.

关 键 词：挥发性有机物(VOCs) Y型分子筛 吸脱附 离子交换 

分 类 号：X511[环境科学与工程—环境工程]