催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (3): 247-253.

• 研究论文 • 上一篇    下一篇

La0.75Sr0.25Mn1-xNixO3+δ材料的制备及其催化甲烷部分氧化性能

王磊, 曾少华, 张丽娟, 陈耀强, 龚茂初   

  1. 四川大学化学学院绿色化学教育部重点实验室, 四川成都610064
  • 收稿日期:2009-03-25 出版日期:2009-03-25 发布日期:2012-12-19

Preparation of La0.75Sr0.25Mn1-xNixO3+δ Materials and Their Catalytic Performance for Methane Partial Oxidation

WANG Lei, ZENG Shaohua, ZHANG Lijuan, CHEN Yaoqiang, GONG Maochu*   

  1. Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
  • Received:2009-03-25 Online:2009-03-25 Published:2012-12-19

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摘要： 采用柠檬酸络合法制备了La0.75Sr0.25Mn1-xNixO3+δ (x = 0, 0.4, 0.5和0.6)系列样品, 考察了其对甲烷部分氧化的催化性能,并采用X射线衍射、H2程序升温还原、O2程序升温脱附和程序升温氧化等测试手段表征样品. 结果表明, 当x = 0, 0.4和0.5时, 样品均形成稳定的钙钛矿结构; 当x = 0.6时样品同时存在钙钛矿和菱形六面体尖晶石结构. 当x = 0.5时样品存在4种可还原物种, 同时具有高的表面氧特别是高的晶格氧含量, 对甲烷部分氧化有利, 这表明La0.75Sr0.25Mn0.5Ni0.5O3+δ具有良好的抗积炭性能. 催化性能测试结果表明, 当x = 0.5时, 样品具有良好的甲烷中温转化率, 最高的CO和H2选择性, 以及在700 oC下最好的反应稳定性和抗积炭能力.

关键词: 掺杂锰酸镧, 镍, 钙钛矿, 甲烷部分氧化, 固体氧化物燃料电池

Abstract: Perovskite materials La0.75Sr0.25Mn1-xNixO3+δ (x = 0, 0.4, 0.5, and 0.6, and the corresponding samples are denoted LSM, LSMN4, LSMN5, and LSMN6) were prepared by a citric chelating method. Among these samples, LSMN5 is prone to catalyze methane partial oxidation at relatively low temperature and has best catalytic performance at high temperature. This may be interpreted by the large amounts of reducible species and oxygen species on the surface and in the bulk.

Key words: doped lanthanum manganite, nickel, perovskite, methane partial oxidation, solid oxide fuel cell