文献类型：期刊文献

英文题名：Desulfurization of Liquid Hydrocarbon Streams via Adsorption Reactions by Silver-Modified Bentonite

作者：Yi, Dezhi[1];Huang, Huan[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：52

期号：18

起止页码：6112

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20132016327865);WOS:【SCI-EXPANDED(收录号:WOS:000318838900006)】；

基金：This work is financially supported by the National Natural Science Foundation of China (No. 21276086) and the 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：Calcination - Fourier transform infrared spectroscopy - Bentonite - Chemical bonds - Silver - Sulfur compounds - Gas adsorption - Hydrocarbons - Thermoanalysis - X ray diffraction

摘要：Removal of organic sulfur compounds from its solution has been investigated by using adsorption. The purpose of this study is to investigate the removal of dimethyl disulfide (DMDS) in liquid hydrocarbon streams with bentonite modified by Ag+. The addition of Ag+ on the bentonite significantly enhanced the adsorption capacity of DMDS. The adsorbents were characterized by nitrogen adsorption, X-ray diffraction (X), and thermal analysis (TGA). Fourier transform infrared (FT-IR) spectroscopy showed that the type and number of surface acidic sites on the adsorbents could increase the adsorption capacity. Several factors that influence the desulfurization capability, including loading, reaction temperature, and calcination temperature, were studied. The maximum sulfur adsorption capacity was obtained at a silver loading of 6 wt %, and the optimum calcination temperature was 150 degrees C. Spectral shifts of the v(C-S), v(S-S), and v(Ag-S) vibrations of the complex compound obtained by the reaction of Ag+ and DMDS were measured with the Raman spectrum. On the basis of complex adsorption reaction and hybrid orbital theory, the adsorption on modified bentonite occurred via multilayer intermolecular forces and S-M (sigma) bonds.