Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (09): 2129-2134.doi: 10.3866/PKU.WHXB201206153

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

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).

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