Methane combustion over Pd/SiO2 catalysts with different degrees of hydrophobicity

P. Araya*, S. Guerrero, J. Robertson, F. J. Gracia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

The combustion of methane has been studied over 1% Pd catalysts supported on commercial silica with different hydrophobicity, prepared by chlorine free precursors. It was found that, when no water is added to the feed, the degree of hydrophobicity of the silica does not affect significantly the behavior of the catalysts. The results show that the activation and deactivation processes are similar for both catalysts. Furthermore, contrary to what is observed on Pd/Al2 O3 and Pd/ZrO2 catalysts, the apparent reaction order with respect to water for Pd/SiO2 catalysts is -0.25. When water is added to the feed, however, the different hydrophobicity of the supports affects the inhibition produced by the adsorption of water on the catalytic surface. Regardless of the hydrophobicity of the support, the addition of water also speeds up the deactivation process of the Pd catalysts supported on silica.

Original languageEnglish
Pages (from-to)225-233
Number of pages9
JournalApplied Catalysis A: General
Volume283
Issue number1-2
DOIs
StatePublished - 8 Apr 2005
Externally publishedYes

Bibliographical note

Funding Information:
The financial support by Conicyt (Project Fondecyt 8000015 and Fondap 1198000-2) is gratefully acknowledged.

Keywords

  • Methane combustion
  • Silica
  • Supported Pd catalyst
  • Water inhibition
  • Zirconia

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