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The influence of ceria and other rare earth promoters on palladium-based methane combustion catalysts

Authors
Journal
Catalysis Today
0920-5861
Publisher
Elsevier
Publication Date
Volume
180
Issue
1
Identifiers
DOI: 10.1016/j.cattod.2011.03.021
Keywords
  • Ceria
  • Palladium
  • Catalytic Combustion
  • Rare Earths
Disciplines
  • Earth Science

Abstract

Abstract In this work we investigate the effect of ceria and other rare earths (La, Pr, Tb) on Pd–PdO transformation, which is strongly related to the catalytic activity of Pd-based catalysts for the combustion of methane at high temperature. Also the behavior of Pd on ZrO 2 and on yttria-stabilized zirconia is considered for comparison. The catalysts are characterized by XRD and BET surface area measurements. Pd–PdO transformation is studied by means of temperature programmed oxidation measurements and thermogravimetric analysis. Temperature programmed combustion experiments have been carried out in order to compare catalytic activity of different catalysts. The results show that rare earth oxides promote the onset of Pd re-oxidation upon cooling, that for ceria doped sample is reflected in an improvement in the catalytic activity.

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