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Catalysis Letters

, Volume 111, Issue 1–2, pp 75–78 | Cite as

Effect of A-site metal on methane combustion on 2% Pd / AMn1-x Fe x O3 (A = Ba, La, Pr; x = 0.4, 0.6, 1) perovskites

  • Markus J. Koponen
  • Tapani Venäläinen
  • Mika Suvanto
  • Kauko Kallinen
  • Toni-J. J. Kinnunen
  • Matti Härkönen
  • Tapani A. Pakkanen
Article

Barium, lanthanum, and praseodymium perovskites were prepared by malic acid complexation. Surface areas of the La and Pr perovskites were between 17.1 and 21.6 m2 g−1. The moderate low surface areas (5.7 mg−1) observed for corresponding barium perovskites were due to the high calcination temperatures. The calcination temperature also affected the shapes and sizes of the perovskite particles. According to SEM images the nanoparticles of the La and Pr perovskites were spherical, whereas those of barium perovskites were flakes. The conversion of methane increased in the order of A-site metal Ba < Pr < La. The CH4 conversion after SO2 treatment correlated with size of the perovskite particles: the smaller the particles the better the activity. The highest methane conversion after SO2 treatment was achieved with lanthanum perovskite with B-site metal combination Mn0.4Fe0.6.

Keywords

perovskite methane combustion SO2 poisoning 

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Markus J. Koponen
    • 1
  • Tapani Venäläinen
    • 1
  • Mika Suvanto
    • 1
  • Kauko Kallinen
    • 2
  • Toni-J. J. Kinnunen
    • 2
  • Matti Härkönen
    • 2
  • Tapani A. Pakkanen
    • 1
  1. 1.Department of ChemistryUniversity of JoensuuJoensuuFinland
  2. 2.Typpitie 1OuluFinland

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