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conference paper

Electrochemical promotion of catalysts for the gas phase combustion of hydrocarbons

Eaves, J.
•
Bolzonella, I.  
•
Comninellis, Ch  
2001
Energy and Electrochemical Processes for a Cleaner Environment

In this work, the voltammetric charge and work function of Rh catalyst were studied to clarify the origin of electrochem. promotion. The measures were carried on at 375 Deg, either in a non-reactive oxygen/helium gas mixt. or under complete oxidn. of propylene. The voltammetric charge measured was strongly dependent of the scan rate and of the surface area of the catalytically active Rh/gas interface. On the base of this result, a model, analogous to that of emersed electrodes in liq. electrochem., was proposed, which postulates the presence of ions coming from the solid electrolyte on the gas exposed catalyst surface. The maximal voltammetric charge that can be stored at the gas exposed catalyst surface (outer charge), detd. by Trasatti's method, increased with the catalytically active Rh surface. The capacity of the Rh/gas interface was calcd., and values from 3 to 200 mF were obtained for different catalyst loadings. Work function measurements were used to study the Rh gas exposed surface under steady state conditions. In oxygen/helium atm. the one-to-one relation between work function and potential was confirmed over the whole potential domain studied. This relation was not valid anymore when stoichiometric oxygen to propylene mixt. was used. [on SciFinder (R)]

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Type
conference paper
Web of Science ID

WOS:000186760400023

Author(s)
Eaves, J.
Bolzonella, I.  
Comninellis, Ch  
Date Issued

2001

Published in
Energy and Electrochemical Processes for a Cleaner Environment
Series title/Series vol.

Proceedings - Electrochemical Society; 2001-23

Start page

242

End page

251

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GGEC  
Available on Infoscience
February 22, 2006
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/225375
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