氧化铈构型对CO甲烷化催化性能的影响  

Effect of CeO_2 crystal structure on catalytic performance of CO methanation catalyst

作　　者：苗彩梅 黄斌 李明[1] 王红 刘进荣[1] Miao Caimei;Huang Bin;Li Ming;Wang Hong;Liu Jinrong(Inner Mongolia University of Technology,Hohhot 010051,Inner Mongolia,China;Baotou Institute of Steel professional and technology,Baotou 014000,Inner Mongolia,China)

机构地区：[1]内蒙古工业大学,内蒙古呼和浩特010051 [2]包头钢铁职业技术学院,内蒙古包头014000

出　　处：《工业催化》2018年第11期71-76,共6页Industrial Catalysis

基　　金：内蒙古自治区自然科学基金资助项目(2016MS0219)

摘　　要：采用液相沉积法,通过控制陈化温度合成六边形氧化铈和方铈矿型氧化铈,采用等体积浸渍法制备Ni/CeO_2催化剂,将其应用于CO甲烷化反应,考察氧化铈载体形貌、催化剂结构对催化剂催化性能的影响。利用XRD、H_2-TPR、SEM和TEM对载体及催化剂进行表征。结果表明,陈化温度对晶体的粒径大小和形貌有直接影响,四边型结构的方铈矿型氧化铈载体结构规整,粒径分布均匀,具有更强的储释氧能力,以其为载体制备的20%Ni/CeO_2-IM2催化剂具有适宜大小的氧化镍颗粒和更低的还原温度,表现出更高的CO转化率和更优的产物分布,在反应温度350℃时,CO转化率为100%,甲烷产率大于85%。Hexagonal CeO2 and cerianite type CeO2 were synthesized by liquid-phase deposition through controlling of ageing temperature. Ni/CeO2 catalysts were prepared by isovolumetric impregnation method and tested in CO methanation. Effects of CeO2 support morphology and catalyst structure on reaction were investigated. The supports and catalysts were characterized by XRD,H2-TPR,SEM and TEM. Results showed that aging temperature influenced size and morphology of crystal. Tetrahedral cerianite type CeO2 carrier had well-defined structure and narrow distribution of pore size. So it had better oxygen storage and release ability. Ni/CeO2-IM2 catalyst had suitable size of Ni O particles and lower reduction temperature. It showed higher CO conversion and better product distribution. Under reaction temperature of 350 ℃,CO conversion was 100% and methane yield was more than 85% over 20% Ni/CeO2-IM2 catalyst prepared by using tetragonal cerianite type CeO2 as support.

关 键 词：催化化学 氧化铈 镍基催化剂 CO甲烷化 晶型效应 

分 类 号：O643.36[理学—物理化学] TQ013.2[理学—化学]