Critical role of water in the direct oxidation of CO and hydrocarbons in diesel exhaust after treatment catalysis

Roberto Caporali, Sarayute Chansai, Robbie Burch, Juan Jose Delgado, Alexandre Goguet, Christopher Hardacre, Loredana Mantarosie, David Thompsett

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)
239 Downloads (Pure)

Abstract

CO and C3H6 oxidation have been carried out in the absence and presence of water over a Pd/Al2O3catalyst. It is clear that water promotes CO and, as a consequence, C3H6oxidation takes place at muchlower temperatures compared with the dry feed. The significant increase in the catalyst’s activity withrespect to CO oxidation is not simply associated with changes in surface concentration as a result ofcompetitive adsorption effects. Utilising18O2as the reactant allows the pathways whereby the oxidationdue to gaseous dioxygen and where the water activates the CO and C3H6to be distinguished. In thepresence of water, the predominant pathway is via water activation with C16O2and C16O18O being themajor species formed and oxidation with dioxygen plays a secondary role. The importance of wateractivation is further supported by the significant decrease in its effect when using D2O versus H2O.
Original languageEnglish
Pages (from-to)764-769
Number of pages6
JournalApplied Catalysis B: Environmental
Volume147
Early online date11 Oct 2013
DOIs
Publication statusPublished - 05 Apr 2014

Keywords

  • Propene
  • Carbon monoxide
  • Palladium
  • Water
  • Deuterium oxide
  • Isotope
  • Oxidation

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Environmental Science(all)

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