文献类型：期刊文献

英文题名：Study on the adsorption behavior and mechanism of dimethyl sulfide on silver modified bentonite by in situ FTIR and temperature-programmed desorption

作者：Huang, Huan[1];Yi, Dezhi[1];Lu, Yannan[1];Wu, Xiaolin[1];Bai, Yunpeng[1];Meng, Xuan[1];Shi, Li[1]

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

年份：2013

卷号：225

起止页码：447

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20132016332626);WOS:【SCI-EXPANDED(收录号:WOS:000321313800053)】；

基金：This work is financially supported by National Natural Science Foundation of China (No. 21276086) and Opening Project of State Key Laboratory of Chemical Engineering of East China University of Science and Technology (No. SKL-ChE-11C04).

语种：英文

外文关键词：Adsorptive desulfurization; Dimethyl sulfide; Bentonite; Silver; In situ FTIR

摘要：A high-performance adsorbent was developed by loading silver on bentonite for the adsorption of dimethyl sulfide (DMS) from liquid hydrocarbon streams under ambient conditions. It demonstrated a high saturated sulfur capacity of 80 mg S/g adsorbent when the bentonite was loaded with 8 wt% Ag+ and calcined at 150 degrees C. The prepared adsorbents were characterized by adsorption of nitrogen (BET), Transmission Electron Microscopy (TEM), X-ray diffraction (XRD), pyridine Fourier transform infrared spectroscopy (pyridine-FTIR) and Thermogravimetric Analysis (TG). The results showed that the silver species dispersed on the surface of bentonite had an important role in determining the DMS removal performance while the surface acid sites of adsorbent had little correlation with the DMS removal performance. Combined techniques of temperature programmed desorption of DMS (DMS-TPD) and in situ Fourier transform infrared spectroscopy (in situ FTIR) were used to investigate the adsorption mechanism of DMS on raw bentonite and Ag+ modified bentonite, respectively. The results revealed that three interaction patterns were existed between the adsorbed DMS and raw bentonite while two interaction patterns were observed between adsorbed DMS and Ag+ modified bentonite. The DMS molecules hardly entered into the interlayer of Ag+ modified bentonite due to the strong interactions between DMS molecules and silver cations. (c) 2013 Elsevier B.V. All rights reserved.