络合制备技术在加氢催化剂中的应用  

Application of Chelating Agents in Preparation of Hydrotreating Catalysts

作　　者：聂红[1] 李会峰[1] 龙湘云[1] 李大东[1] 

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《石油学报（石油加工）》2015年第2期250-258,共9页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点基础研究发展计划"973"项目(2012CB224802)基金资助

摘　　要：以柠檬酸为例,阐述了络合制备技术在加氢催化剂制备过程中的应用。通过总结柠檬酸在配制金属浸渍液、浸渍、干燥、焙烧以及硫化过程中的作用,揭示了柠檬酸提高催化剂性能的作用机制。首先,在适宜pH值区间浸渍液中的柠檬酸与金属物种形成的络合物有助于调节Ni(Co)与W(Mo)物种的硫化速率。其次,在硫化过程中部分柠檬酸转化为碳物种保留在催化剂上。这些碳物种的存在一方面可修饰载体表面,促进金属物种硫化;另一方面可隔离已生成的WS2(或MoS2),避免其聚集长大,有利于形成尺寸较小的高活性Ni(Co)-W(Mo)-SⅡ类活性相。中国石化石油化工科学研究院(RIPP)利用不断改进并完善的络合制备技术,成功开发了RS-1000、RS-2000等一系列高性能柴油超深度加氢脱硫催化剂。Taking citric acid as an example, the application of chelating agents in the preparation of hydrotreating catalysts was reviewed. The roles of citric acid in the impregnating solutions and the procedures of impregnating, drying, calcining and sulfidation were analyzed, respectively, so as to deepen the insight into the promoting mechanism of the addition of citric acid. First, citric acid and metal species can form complexes at proper pH range, which could adjust the sulfidation rate of Ni （Co） and W （Mo）. Second, during sulfidation citric acid could be partly changed into carbonaceous deposits, which may play roles in tailoring the support surface to promote the sulfidation of metal species, isolating the WS2 （MoS2） slabs to avoid their aggregation and facilitating the formation of highly active Ni （Co）-W （Mo）-S Ⅱ phases of shorter sIab length. Through continuous efforts in modifying and improving catalyst preparation technology with chelating agents, RIPP has successfully developed a series of highly active catalysts （RS-1000 and RS 2000, etc） for ultra-deep hydrodesulfurization of diesel.

关 键 词：络合剂 柠檬酸 金属-载体作用 硫化 碳物种 修饰 隔离 加氢催化剂 

分 类 号：TQ426.9[化学工程]