文献类型：期刊文献

英文题名：Ion-exchange modified zeolites X for selective adsorption desulfurization from Claus tail gas: Experimental and computational investigations

作者：Chen, Xi[1];Shen, Benxian[1];Sun, Hui[1];Zhan, Guoxiong[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：261

起止页码：227

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20174704415150);WOS:【SCI-EXPANDED(收录号:WOS:000427668000028)】；

基金：This work is financially supported by the Training Program of the Major Research Plan of the National Natural Science Foundation of China (Grant 91634112), the Natural Science Foundation of Shanghai (Grant 16ZR1408100), the Fundamental Research Funds for the Central Universities of China (Grant 22A201514010) and the Open Project of State Key Laboratory of Chemical Engineering (SKL-ChE-16C01).

语种：英文

外文关键词：Silver compounds - Ion exchange - Metal ions - Metals - Zeolites - Adsorption

摘要：Zn, Co and Ag modified NaX zeolites were prepared by ion-exchange method and the post-synthesized samples were characterized using EDS, XRD, FT-IR, SEM and N2 adsorption. The selective adsorption performances for H2S and COS from Claus tail gas were evaluated in a fixed bed adsorption column. In addition, the underlying mechanism for H2S and COS adsorption on zeolites X was revealed by DFT computation. Among all the samples, AgX shows the most excellent adsorption performance, which shows the highest H2S and COS breakthrough adsorption capacities up to 1.53 mmol/g and 10.5 mol/g, respectively. The used AgX zeolite can also be regenerated by thermal treatment at 350 degrees C under air atmosphere. The DFT study indicates that the S-M bond between H2S or COS and metal ion can be formed during the adsorption process. Furthermore, the Ag-sulfide complex shows the strongest S-M interaction, hence, benefits the adsorption of H2S and COS on Ag-exchanged zeolite X.