The influence of surface functionalization of activated carbon on palladium dispersion and catalytic activity in hydrogen oxidation

V.Z. Radkevich, T.L. Senko, K. Wilson, L.M. Grishenko, A.N. Zaderko, V.Y. Diyuk

Research output: Contribution to journalArticle

Abstract

Stone-fruit activated carbon (SAC) and modified versions containing acidic oxygen and basic nitrogen groups have been used to prepare palladium catalysts by wet impregnation. Carbon supports and catalysts are investigated by thermo-gravimetric analysis, TPD, oxygen chemisorption, TEM and XPS. The influence of the nature of the functional groups on the dispersion and oxidation state of palladium and its activity in hydrogen oxidation is investigated. Pd dispersion is found to increase with the basic strength of functional groups on the support. XPS reveals that introduction of amine groups in SAC results in an increased proportion of Pd0, resistant to re-oxidation. Palladium catalysts supported on activated carbon modified by diethylamine groups are found to exhibit the highest metal dispersion and greatest activity in hydrogen oxidation.
Original languageEnglish
Pages (from-to)241-251
Number of pages11
JournalApplied Catalysis A: General
Volume335
Issue number2
Early online date20 Nov 2007
DOIs
Publication statusPublished - 8 Feb 2008

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Keywords

  • activated carbon
  • surface functional groups
  • surface amine groups
  • palladium supported catalysts
  • hydrogen oxidation
  • XPS

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