摘要
钴或镍在加氢脱硫(HDS)催化剂中的助剂作用文献已有很多的讨论。近年来,研究结果发现,少量的钌加入到Mo/Al_2O_3和Co-Mo/Al_2O_3催化剂上可以显著地提高其加氢脱硫活性,可是关于钌的助剂作用前人研究的较少。因此对比研究钴和钌的的助剂作用有助于认识各种不同类型的助剂在加氢脱硫催化剂中的功能。本文应用程序升温还原方法对钴和钌在加氢脱硫催化剂的前身态氧化物还原过程中的助剂作用进行了考察。
Temperature programmed reduction has been used to study the reduction of Mo, Co, Ru oxide catalysts. It is found that octahedral and tetrahedral Mo sites on Mo/Al_2O_3 oxide catalysts are reduced at 800K and 1180K respectively. Three kinds of Co sites were found to exist on Co/Al_2O_3 oxide catalysts, i.e. octahedral and tetrahedral Co sites and Co_3O_4 phase corresponding to reduction peaks at 700K, 940K and 850K. On the Co-Mo/Al_2O_3 oxide catalysts cobalt mainly interacted with Mo sites to form a CoMoO mixed phase, but had no evident influence on the reduction of Mo sites. In contrast to cobalt, ruthenium showed an enhancing effect for the reduction of Mo sites, and lowered the reducing temperature of octahedral Mo sites by 230K. These facts are explained by the dissociation of hydrogen on ruthenium and its spillover to Mo sites.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1992年第4期435-439,共5页
Journal of Fuel Chemistry and Technology
关键词
还原
脱硫
催化剂
氢化
temperature programmed reduction
catalysts for hydrodesulfurization
cobalt and ruthenium promotion
