不同助剂掺杂的铬基催化剂的制备及其对乙烷氧化脱氢的催化性能  

Preparation of Chromium Catalysts with Different Promoters and Their Catalytic Performance for Oxidative Dehydrogenation of Ethane

作　　者：刘瑞[1] 敬方梨 罗仕忠[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《合成化学》2017年第11期898-903,共6页Chinese Journal of Synthetic Chemistry

基　　金：国家自然科学基金资助项目(21476145;21506111);四川省科技支撑项目计划(2016GZ0371)

摘　　要：以硝酸盐作为前驱体,Al_2O_3为载体,采用等体积浸渍法制备了系列不同助剂(Mn,Co,Ce)及不同助剂含量(1%,3%,5%,7%,10%)掺杂的铬基催化剂,其结构经X-射线粉末衍射(XRD)、H_2程序升温还原(H_2-TPR)和CO_2程序升温脱附(CO_2-TPD)表征。并考察了催化剂对乙烷氧化脱氢反应的催化性能。结果表明:添加Co助剂有利于活性组分铬的分散,10Cr-3Co/γ-Al_2O_3催化剂表现出最佳催化性能,在反应温度为650℃,V(CO_2)∶V(C_2H_6)=3∶1,空速(GHSV)为3 600 mL·(g·h)^(-1)条件下,在该催化剂上乙烯产率为36.5%。A series of Cr-Me/T-AlzO3 catalysts with different promoters （Mn, Co, Ce） and different Co loadings were prepared via impregnation method. The catalysts were characterized by X-ray diffrac- tion（XRD）, H2 temperature-programmed reduction （Hz-TPR） and CO2 temperature programmed de- sorption （ CO2-TPD）. The catalytic performance of the catalysts in the oxidative dehydrogenation of eth- ane with CO2 was investigated. The results showed that the modified Cr-Co/T-Al2O3 is advantageous to the dispersion of chromium. The optimal reaction conditions were as followed： V（ CO2） ：V（ C2H6） was 3：1, and space velocity（GHSV） was 3 600 mL · （g · h） -i, reaction at 650 ℃. 10Cr-3Co/T- Al2O3 catalyst showed the best catalytic performance of oxidative dehydrogenation of ethane with the ethylene yield of 36.5 %.

关 键 词：乙烷脱氢 乙烯 催化氧化 助剂 Cr-Co双金属氧化物 

分 类 号：O643.32[理学—物理化学]