Controlled spillover in a single catalyst pellet: Rate modification, mechanism and relationship with electrochemical promotion

Danai Poulidi, Maria Elena Rivas, Ian S. Metcalfe

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The effect of spillover processes on the activity of a catalyst system consisting of a mixed oxygen ion and electronic conducting support La0.6Sr0.4Co0.2Fe0.8O3d and a metal catalyst (Pt) were investigated. Two types of model single-pellet catalysts were used employing Pt deposited on both sides of a dense LSCF disc pellet. One of these single pellets employed highly disperse, physically non-continuous Pt, in contrast to studies on electrochemical promotion, while the other used a low dispersion continuous film. Driving forces for promoter migration were controlled through the manipulation of the oxygen chemical potential difference across the membrane. Catalyst rate modification was observed in all cases. However, it was found that there is a complex relationship between the rate modification, the driving forces for spillover and the geometrical arrangement of the catalyst on the support (i.e. catalyst dispersion).
Original languageEnglish
Pages (from-to)188-197
Number of pages10
JournalJournal of Catalysis
Volume281
Issue number1
Early online date25 May 2011
DOIs
Publication statusPublished - 01 Jul 2011

Keywords

  • Metal–support interactions
  • Spillover
  • Catalyst promoters
  • Electrochemical promotion

Fingerprint

Dive into the research topics of 'Controlled spillover in a single catalyst pellet: Rate modification, mechanism and relationship with electrochemical promotion'. Together they form a unique fingerprint.

Cite this