Catalysis Letters

, Volume 117, Issue 1–2, pp 73–78 | Cite as

Remarkable effect of addition of In and Pb on the reduction of N2O by CO over SiO2 supported Pd catalysts

  • Takashi Hirano
  • Yuiko Kazahaya
  • Akio Nakamura
  • Toshihiro Miyao
  • Shuichi Naito
Article
First Online:
Received:
Revised:
Accepted:

Abstract

The effect of addition of In and Pb on the reduction of N2O by CO was studied over SiO2 supported Pd catalysts, using a closed gas circulation system as well as in-situ infrared spectroscopy. Formation of intermetallic compounds such as Pd0.48In0.52, Pd3Pb and Pd3Pb2 was observed which caused a drastic enhancement of the rate of N2 formation. The infrared spectroscopic analyses revealed a weakening of the adsorption strength of CO on Pd metal by the formation of intermetallic compounds, which is likely the main reason for the enhancement of the reaction rate. From a kinetic investigation as well as in situ FT-IR observation during the N2O-CO reaction, a redox mechanism was proposed involving the oxidation of the surface by N2O followed by its reduction by CO. Over Pd/SiO2, the former process seems to be the rate limiting step because of the inhibition of N2O activation by strongly adsorbed CO. By adding In or Pb, the rate limiting step shifted to the latter process, which resulted in a large enhancement in the rate of N2 formation.

Keywords

Intermetallic Compound Reaction Order Adsorbed Species PbO2 Adsorption Strength 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Takashi Hirano
    • 1
  • Yuiko Kazahaya
    • 1
  • Akio Nakamura
    • 1
  • Toshihiro Miyao
    • 1
  • Shuichi Naito
    • 1
  1. 1.Department of Material and Life ChemistryKanagawa UniversityYokohamaJapan

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