Selective Adsorption of Sulfur Compounds in Model Gasoline Containing Olefins by Modified Zeolites  

作　　者：Wang Hongguo Song Lijuan Lian Peiyong Pan Mingxue Ju Xiufang Sun Zhaolin 

机构地区：[1]Liaoning Key Laboratory of Petrochemical Engineering, Liaoning Shihua University, 113001 [2]College of Chemistry ＆ Chemical Engineering, China University of Petroleum （East China）

出　　处：《China Petroleum Processing & Petrochemical Technology》2010年第3期43-48,共6页中国炼油与石油化工（英文版）

基　　金：supported by the National Natural Science Foundation of China(No. 20476042 and No.20776064);the Ministry of Science and Technology of the People's Republic of China under the National Basic Research Program of China(973 Program) (2007CB216403)

摘　　要：The effects of olefins were quantified by measuring the decreased amount of thiophenes removed by modified zeolites with an increasing olefin concentration in model fuels （300 ppm） via fixed-bed adsorption technique at room temperature and atmosphere pressure. The influence of olefins on adsorptive desulfurization of model fuel had been investigated by FT-IR techniques, which revealed that the protons in the zeolites were the sites responsible for the adsorption of olefins. On the CeY zeolite, in the presence of strong hydroxyl species in the zeolites, the adsorbed olefin compounds can attach to the protons molecularly via electrophilic interaction and undergo the opening of the C=C bonds depending on the acidity of the zeolites. The reduced desulfurization performance of CeY zeolite was attributed to the direct occupation of the absorbent＇s active sites by olefins. In contrast to the CeY zeolite, the NiY zeolites were unable to react directly with pure olefins. However the sulfur compounds and olefins adsorbed on the protons may subsequently undergo olefin alkylation reactions, which can block the zeolite pores and then prevent sulfide molecules from having access to super-cages to contact with the metal cations. This work demonstrates also that the NiY zeolites exhibit excellent performance for selective adsorption desulfurization of model fuel containing olefin compounds.

关 键 词：DESULFURIZATION ADSORPTION zeolites OLEFIN FT-IR 

分 类 号：O561.5[理学—原子与分子物理] TE626.21[理学—物理]