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柠檬酸对焦化粗苯加氢Co-Mo催化剂性能和结构的影响

发表时间:2012-04-15  浏览量:1275  下载量:518
全部作者: 屈中伟,杜小弟,曾凯,雷家珩
作者单位: 武汉理工大学理学院
摘 要: 以γ-Al2O3为载体,Co,Mo为活性金属组分,采用等体积溶液浸渍法制备焦化粗苯加氢脱硫催化剂,考察浸渍液中加入柠檬酸对催化剂性质及其结构的影响。BET,X射线衍射(X-ray diffraction, XRD)和热重分析-微分扫描量热(thermogravimetric-differential scanning calorimeter, TG-DSC)等的表征结果表明:在浸渍液中添加螯合剂CA,可增大Co-Mo催化剂的BET比表面积和孔容,并能形成更多的孔。添加螯合剂CA后,Co2+与CA形成螯合物,降低其与载体之间的作用。CA浓度增加会促使Mo相形成硫化不完全的Mo3S4,Co相形成硫化完全的CoS相。螯合剂CA的加入可延迟Co相的硫化,从而使其更多地覆盖在MoS2相的侧面和边缘,形成更多活性中心。
关 键 词: 催化化学;螯合剂;加氢脱硫;焦化粗苯
Title: Effect of citric acid on Co-Mo hydrodesulfurization catalysts of coking benzol
Author: QU Zhongwei, DU Xiaodi, ZENG Kai, LEI Jiaheng
Organization: School of Science, Wuhan University of Technology
Abstract: Coking benzol hydrodesulfurization catalysts were prepared by the isovolumic impregnation method using cobalt and molybdenum as active metals. The properties of the catalyst modified by citric acid in the impregnation solution and the catalytic performance and the structure of hydrodesulfurization were examined. The physical and chemical properties of the catalysts were investigated with BET, X-ray diffraction (XRD) and thermogravimetric-differential scanning calorimeter (TG-DSC), it was revealed that the BET specific surface area and pore volume of Co-Mo catalyst were increased by adding CA in the impregnation solution, and also more pores were made. The interaction between Co and carrier was reduced when Co2+ chelated with CA. The increase of CA concentration leaded to the Mo sulfide phase tended to form Mo3S4 phase, Co sulfide phase tended to form CoS phase. The sulfuration of Co phase was delayed by adding CA, leading to cover the sides and edges of MoS2 phase, and form more active centers.
Key words: catalytic chemistry; chelating agent; hydrodesulfurization; coking benzol
发表期数: 2012年4月第7期
引用格式: 屈中伟,杜小弟,曾凯,等. 柠檬酸对焦化粗苯加氢Co-Mo催化剂性能和结构的影响[J]. 中国科技论文在线精品论文,2012,5(7):661-665.
 
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