Ni_aCu_b(ZrCeO_4)_8O_x催化剂在水煤气变换反应中的活性和选择性研究  

Activity and selectivity Ni_aCu_b(ZrCe_4)_8O_x catalyst for CO water-gas shift reaction

作　　者：刘天时[1] 吴洪达[1] 刘含智[1] 王令兆[1] 

机构地区：[1]广西科技大学生物与化学工程学院,广西柳州545006

出　　处：《化学研究与应用》2016年第1期76-82,共7页Chemical Research and Application

基　　金：广西自然科学基金项目(桂科自0542018)资助

摘　　要：用共沉淀法制备Ce O_2-Zr O_2复合氧化物载体,浸渍法制备Ni_aCu_b(ZrCeO_4)_8O_x催化剂;用X射线衍射技术(XRD),程序升温还原(H_2-TPR)技术对催化剂的物相结构和还原特性进行表征;研究了催化剂对CO水煤气变换反应的活性与选择性,考察了催化剂组成对CO水煤气变换反应的影响。实验结果表明:Cu_aFe_b(Zr Ce_4)_8O_x具有稳定的立方晶相结构,催化剂对水煤气变换反应表现了良好的活性;载体表面的铜镍物种间存在相互作用,Ni0为甲烷化反应的活性中心;在400℃下,以(Ni_6Cu_4)(Zr Ce_4)_8O_x催化CO水煤气变换反应,CO转化率达到95.42%,甲烷的产率为5.22%;550℃下使用该催化剂时,也未出现明显失活。Ce O2-Zr O2 composite oxide was synthesized with precipitation method and NiaCub（ZrCeO4）8Oxcatalysts were prepared by impregnation.X-ray diffraction and H2 temperature program reduction techniques were used to characterize the crystal phases and reduction properties of catalysts.The activity and selectivity of catalysts in water gas shift was studied,and the relationship catalyst composition with the activity for the water gas shift was also investigated.The results suggested that the catalysts were remarkable cubic phase framework.The catalysts exhibit good reducibility.There were inttractions between copper and nickel specier on the surface of the support,the bulk Ni0 is the key active component for methanation. For（ Ni6Cu4）（ Zr Ce4）8Oxcatalyst,Conversion rate of CO reaches 95. 42% and CH4 production rate reached to 5. 22% at temperature of 350℃. while catalyst shows good catalytic activity in the reaction of water gas shift at 550℃ without obvious inactivation.

关 键 词：催化剂 铜 镍 水煤气变换 

分 类 号：TQ032.4[化学工程]