作　　者： ; ;

机构地区： 武汉化工学院化工与制药学院化学工程与工艺系

出　　处： 《石油学报（石油加工）》 1997年第2期119-123,共5页

摘　　要： 用共沉淀、浸渍和固相反应３种方法制备了不同钴铬原子比的复合氧化物催化剂，考察了它们的催化氧化四氢萘的性能。结果表明，共沉淀是最好的制备方法，在本实验中Ｃｏ／Ｃｒ＝１为最佳的配比。用ＸＲＤ、ＴＰＲ、ＥＰＲ对催化剂的结构进行了表征。结果表明，用Ｃｒ２Ｏ３浸渍Ｃｏ２＋后于３００℃下焙烧的样品物相以Ｃｒ２Ｏ３形式为主，用共沉淀和固相反应法制备的样品物相为具有尖晶石结构的Ｃｏ３－ｘＣｒｘＯ４；催化剂的还原温度愈低，其催化活性愈高。在本实验中，以共沉淀法制得的Ｃｏ１．５Ｃｒ１．５Ｏ４具有最高的吸附氧量，相应地也具有最高的催化活性。所有催化剂的四氢萘酮选择性均在８０ｍｏｌ％左右。 Complex oxide catalysts with various cobalt vs. chromium atomic ratios were separately prepared by coprecipitation, impregnation and solid reaction methods. Their catalytic properties for catalytic oxidation of tetralin were investigated. The structures of the catalysts were characterized by XRD, TPR and EPR. For catalysts prepared by the impregnation method (Co 2+ salt on Cr 2O 3,then calcined at 300℃), the major phase presented as Cr 2O 3,as for catalysts prepared by the other two above mentioned methods, the major phase all presented as crystalline spinel Co 3- x Cr x O 4.The catalytic oxidation avtivity of catalysts increases with the decrease of reduction temperature. Coprecipitated Co 1 5 Cr 1 5 O 4showed the highest specific activity, and the optimum Co/Cr ratio was to be 1. The selectivity to tetralone of all samples was about 80%.

关 键 词： 钴铬复合氧化物 四氢萘 催化氧化 催化剂

领　　域： [理学] [理学]