Remote control of the activity of a Pt catalyst supported on a mixed ionic electronic conducting membrane

Danai Poulidi*, Craig Anderson, Ian S. Metcalfe

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A novel configuration for the in situ control of the catalytic activity of a polycrystalline Pt catalyst supported on a mixed ionic electronic conducting (MIEC) substrate is investigated. The modification of the catalytic activity is achieved by inducing the reverse spillover of oxygen promoting species from the support onto the catalyst surface, thus modifying the chemisorptive bond energy of the gas phase adsorbed reactants. This phenomenon is known as Electrochemical Promotion of Catalysis (EPOC). In this work we investigate the use of a wireless system that takes advantage of the mixed ionic electronic conductivity of the catalyst support (internally short-circuiting the system) in a dual chamber reactor. In this wireless configuration, the reaction takes place in one chamber of the membrane reactor while introduction of the promoting species is achieved by the use of an appropriate sweep gas (and therefore control of the oxygen chemical potential difference across the membrane) on the other chamber. Experimental results have shown that the catalytic rate can be enhanced by using an oxygen sweep, while a hydrogen sweep can reverse the changes. Total rate enhancement ratios of up to 3.5 were measured.

Original languageEnglish
Pages (from-to)1347-1350
Number of pages4
JournalSolid State Ionics
Volume179
Issue number27-32
DOIs
Publication statusPublished - 30 Sep 2008

Keywords

  • Catalyst remote control
  • Ethylene oxidation
  • Mixed ionic electronic conductors
  • Wireless EPOC

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

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