作　　者： ; ; ; ; ; ;

机构地区： 广东工业大学轻工化工学院

出　　处： 《分子催化》 2007年第3期209-214,共6页

摘　　要： 采用不同方法制备了镍基催化剂,并考察了乙烷氧化脱氢制乙烯(ODE)的反应活性,结果表明,在3种不同制备方法的催化剂上,ODE反应的活性及产物选择性存在明显差异,浸渍法制备的催化剂性能最佳.在相同的条件下,以共浸渍法引入CeO2助剂后,N iO/-γA l2O3催化剂上的低温选择氧化活性显著提高,而目的产物C2H4的选择性变化不大.XRD,还原TG和XPS对催化剂进行表征的结果显示:反应的活性物相可能是易于还原的高度分散于催化剂表面的微晶N iO和表面尖晶石N iA l2O4物相;高分散的微晶N iO,类似于纯N iO,有利于ODE反应低温选择氧化生成目的产物C2H4,而易还原的表面尖晶石N iA l2O4物相的存在则可能是在高温下获得高选择氧化活性和选择性的主要原因之一. Ni-Based catalysts were prepared by different methods and the activity of oxidative dehydrogenation of ethane to ethylene（ODE） was investigated. The results showed that the activity and selectivity of ODE over three types of catalysts are different from one another, of which the catalyst synthesized by impregnation method exhibit the best catalytic performances. Under the same conditions, the activity of NiO/γ-Al2O3 introducted of CeO2as promoter is increased greatly at low temperature, however tion of XRD, XPS and H2-TG showed that the easily ＇surface spinel＇ NiAl2O4 may be the active species; NiO favors for the activity under low temperature ; The the selectivity doesn＇ t changed distinctly. The characterizareducible and high-distributed NiO microcrystalline and the The high-distributed NiO microcrystalline is similar to pure existence of surface spinel NiAl2O4 is one of the main reason for the activity under high temperature and selectivity for ODE.

关 键 词： 氧化脱氢 镍基催化剂 制备方法 氧化铈

领　　域： [理学] [理学]