物理化学学报 >> 2012, Vol. 28 >> Issue (09): 2129-2134.doi: 10.3866/PKU.WHXB201206153

催化和表面科学 上一篇    下一篇

La0.8Sr0.2Fe1-xScxO3-δ催化剂的制备、表征及甲烷催化燃烧性能

雷泽, 孙义, 韩敏芳, 王启宝   

  1. 中国矿业大学(北京)化学与环境工程学院, 煤气化燃料电池研究中心, 北京 100083
  • 收稿日期:2012-03-26 修回日期:2012-06-14 发布日期:2012-08-02
  • 通讯作者: 雷泽 E-mail:zelei@home.ipe.ac.cn
  • 基金资助:

    国家自然科学基金(20806088)资助项目

Preparation, Characterization and Catalytic Activities of La0.8Sr0.2Fe1-xScxO3-δ Catalysts for Methane Combustion

LEI Ze, SUN Yi, HAN Min-Fang, WANG Qi-Bao   

  1. Research Center of Fuel Cell on Coal Gasification, School of Chemical and Environmental Engineering, China University of Mining & Technology, Beijing 100083, P. R. China
  • Received:2012-03-26 Revised:2012-06-14 Published:2012-08-02
  • Contact: LEI Ze E-mail:zelei@home.ipe.ac.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20806088).

摘要:

采用甘氨酸-硝酸盐溶液燃烧法制备了钙钛矿型氧化物催化剂La0.8Sr0.2Fe1-xScxO3-δ (LSFS, x=0, 0.3,0.4, 0.5, 0.6, 0.8, 1), 利用X射线衍射(XRD)、H2程序升温还原(H2-TPR)、扫描电子显微镜(SEM)和比表面积测试等手段对催化剂进行了系统表征, 并在常压微型固定床反应器上考察了催化剂对甲烷燃烧的催化性能. 结果表明, 经空气气氛下900 °C煅烧5 h制备的LSFS均具有单一的钙钛矿结构, 在La0.8Sr0.2FeO3-δ (LSF)中掺杂Sc有助于改善催化剂的抗烧结性能, 提高催化剂的比表面积. 当LSF 中的Sc 掺杂量为0.4-0.6 时, 所形成的LSFS表现出良好的甲烷催化燃烧活性, 其中Sc 掺杂量为0.5 时, 其起燃温度(T10)和完全转化温度(T90)分别为406和563 °C, 与La0.8Sr0.2FeO3-δ和La0.8Sr0.2ScO3-δ相比, T10分别降低了14和87 °C; T90分别降低了59和95 °C.

关键词: 甲烷, 催化燃烧, 钙钛矿, 钪, 锶掺杂铁酸镧

Abstract:

Perovskite-type La0.8Sr0.2Fe1-xScxO3-δ (LSFS, x=0, 0.3, 0.4, 0.5, 0.6, 0.8, 1) catalysts were prepared by glycine-nitrate solution combustion. The catalysts were characterized by X-ray powder diffraction (XRD), H2-temperature-programmed reduction (H2-TPR), scanning electron microscopy (SEM), and specific surface area measurements. The catalytic performance of LSFS for methane combustion was investigated in a micro fixed-bed reactor. The results showed that all the LSFS catalysts have a single perovskite structure after calcining in air at 900 °C for 5 h. By doping Sc into La0.8Sr0.2FeO3-δ, the sintering agglomeration between the LSFS particles is weakened, and therefore the specific surface area is increased. At Sc dopings of 0.4-0.6, the resultant LSFS gives good catalytic activity for methane combustion, with a light-off temperature (T10) of 406 °C and a total conversion temperature (T90) of 563 °C at a Sc doping of 0.5. Compared with La0.8Sr0.2FeO3-δ and La0.8Sr0.2ScO3-δ the T10 is decreased by 14 and 87 °C, and T90 is decreased by 59 and 95 °C, respectively.

Key words: Methane, Catalytic combustion, Perovskite, Scandium, Strontium doped lanthanum ferrite

MSC2000: 

  • O643