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

doi:10.3866/PKU.WHXB201206153

Abstract

Abstract:

Perovskite-type La_0.8Sr_0.2Fe_1-xSc_xO_3-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 La_0.8Sr_0.2FeO_3-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 La_0.8Sr_0.2FeO_3-δ and La_0.8Sr_0.2ScO_3-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

LEI Ze, SUN Yi, HAN Min-Fang, WANG Qi-Bao. Preparation, Characterization and Catalytic Activities of La_0.8Sr_0.2Fe_1-xSc_xO_3-δ Catalysts for Methane Combustion[J]. Acta Phys. -Chim. Sin. 2012, 28(09), 2129-2134. doi: 10.3866/PKU.WHXB201206153

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Preparation, Characterization and Catalytic Activities of La_0.8Sr_0.2Fe_1-xSc_xO_3-δ Catalysts for Methane Combustion

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

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Preparation, Characterization and Catalytic Activities of La_0.8Sr_0.2Fe_1-xSc_xO_3-δ Catalysts for Methane Combustion