催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (7): 747-750.

• 研究论文 • 上一篇    下一篇

LaZnxFe1-xO3 钙钛矿型纳米催化剂的制备、表征及其甲苯燃烧性能

Seyed Ali HOSSEINI1,*, Mohammad Taghi SADEGHI2, Abdolali ALEMI2, Aligholi NIAEI1, Dariush SALARI1, Leila KAFI-AHMADI2   

  1. 1Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran 2Department of Inorganic Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
  • 收稿日期:2010-07-25 出版日期:2010-07-25 发布日期:2010-07-25

Synthesis, Characterization, and Performance of LaZnxFe1-xO3 Perovskite Nanocatalysts for Toluene Combustion

Seyed Ali HOSSEINI1,*, Mohammad Taghi SADEGHI2, Abdolali ALEMI2, Aligholi NIAEI1, Dariush SALARI1, Leila KAFI-AHMADI2   

  1. 1Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran 2Department of Inorganic Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
  • Received:2010-07-25 Online:2010-07-25 Published:2010-07-25

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摘要： Nanostructured LaFeO3 and substituted LaZnxFe1-xO3 (x = 0.01, 0.05, 0.1, 0.2, and 0.3) perovskites were synthesized by the sol-gel auto-combustion method and used in the catalytic combustion of toluene. Their structures and surface properties were investigated by X-ray diffraction, Fourier transmission infrared spectroscopy, BET surface area, and scanning electron microscopy. Characterization data revealed that the total insertion of zinc into LaFeO3 takes place when x ≤ 0.1. However, ZnO segregation occurs to some extent, especially at x > 0.1. The performance of these perovskites was evaluated by toluene combustion. The catalytic activity of the catalysts increased substantially with an increase in zinc substitution. These results can be attributed to the cooperative effect between LaZnxFe1-xO3 and the zinc oxide phases. The relative concentration of these phases determines their oxygen activation ability and reactivity.

关键词: sol-gel auto-combustion, perovskite, toluene, catalytic oxidation, LaZnxFe1-xO3

Abstract: Nanostructured LaFeO3 and substituted LaZnxFe1-xO3 (x = 0.01, 0.05, 0.1, 0.2, and 0.3) perovskites were synthesized by the sol-gel auto-combustion method and used in the catalytic combustion of toluene. Their structures and surface properties were investigated by X-ray diffraction, Fourier transmission infrared spectroscopy, BET surface area, and scanning electron microscopy. Characterization data revealed that the total insertion of zinc into LaFeO3 takes place when x ≤ 0.1. However, ZnO segregation occurs to some extent, especially at x > 0.1. The performance of these perovskites was evaluated by toluene combustion. The catalytic activity of the catalysts increased substantially with an increase in zinc substitution. These results can be attributed to the cooperative effect between LaZnxFe1-xO3 and the zinc oxide phases. The relative concentration of these phases determines their oxygen activation ability and reactivity.

Key words: sol-gel auto-combustion, perovskite, toluene, catalytic oxidation, LaZnxFe1-xO3