In consideration of precursor states, spillover and Boudart's collection zone' and of their role in catalytic processes

M. Bowker, L. J. Bowker, R. A. Bennett, P. Stone, A. Ramirez-Cuesta

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Various aspects of 'spillover' and 'reverse spillover' in catalysis are considered. The ideas of Kisliuk regarding the kinetic role of weakly held adsorbed states as precursors to stronger chemisorption are shown to be important for reverse spillover, as highlighted by Boudart's concept of the 'collection zone'. STM has proved to be an important tool for the understanding of the formation and thermal evolution of nanoparticles on surfaces. Here we present direct, in situ observations of spillover for the reaction of oxygen with Pd nanoparticles on TiO2(1 1 0). In tum, this is connected to a form of SMSI, and it is proposed that this spillover may also be the mechanism of the oxygen storage phenomenon for CeO2-doped automobile catalysts. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)221-232
Number of pages12
JournalJournal of Molecular Catalysis A: Chemical
Volume163
Issue number1-2
DOIs
StatePublished - Dec 4 2000
Externally publishedYes

Funding

We are grateful for support for fellowships to RAB and AR from the EPSRC through grants GR/L22584 and GR/L13681 and to the University of Reading for the provision of a well-founded laboratory.

Keywords

  • Boudart
  • Catalysis
  • Collection zone
  • Nanoparticles
  • Oxygen storage
  • SMSI
  • STM
  • Spillover

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