稀土镱助剂及制备方法对镍基催化剂天然气水蒸气重整性能的影响  

Influences of additive Yb and its preparation methods on performance of nickel-based catalysts for natural gas steam reforming

作　　者：徐立昊[1] 米万良[1] 苏庆泉[1] 

机构地区：[1]北京科技大学机械工程学院热科学与能源工程系,北京100083

出　　处：《化工学报》2011年第4期953-961,共9页CIESC Journal

基　　金：国家自然科学基金项目(20776016;21006005)~~

摘　　要：着重考察了稀土助剂Yb及两种浸渍制备法(共浸渍和分步浸渍)对Ni/γ-Al2O3型重整催化剂的活性、抗积炭性以及抗烧结性的影响,并与稀土助剂La、Ce进行了比较,进而通过催化剂的BET、XRD、TPR、H2化学吸附、TG表征,对其影响机理进行了讨论。实验结果表明:添加稀土助剂能够有效提高活性金属Ni的分散度,从而提高其催化活性,同时还提高了抗积炭以及抗烧结性能,共浸渍法使活性金属Ni较难还原,影响了催化剂的低温活性。活性强化效果从大到小的顺序为Yb>Ce>La,而抗积炭性能强化效果由强到弱的顺序为Ce>Yb>La。Yb助剂改性的Ni/γ-Al2O3重整催化活性优于德国南方化学与四川亚联两种Ni系商业重整催化剂。The influences of rare-earth promoter Yb and two impregnation methods（co-impregnation and stepwise impregnation）on the activity,carbon deposition resistance and sintering resistance of Ni/γ-Al2O3 reforming catalysts were studied and compared with other two rare-earth promoters,La and Ce.The catalyst was characterized with BET,XRD,TPR,H2 chemisorption and TG to investigate the possible mechanism of influence.The addition of rare-earth enhances the dispersion of active metal nickel effectively,consequently improve the catalytic activity,carbon deposition resistance and sintering resistance of the catalysts,the co-impregnation makes the active metals more difficult to be reduced,which influences the catalytic activities in the low temperature region.For improving the activity,the ranking is YbCeLa,and for improving the carbon deposition resistance,the ranking is CeYbLa.The reforming activity of Yb modified Ni/γ-Al2O3 catalyst is higher than that of two commercial catalysts which are Ni based reforming catalysts belong to Süd-Chemie and Sichuan Ally.

关 键 词：天然气 水蒸气重整 Ni/γ-Al2O3系催化剂 稀土助剂Yb 表征 

分 类 号：TQ116.25[化学工程—无机化工]