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Journal of Applied Electrochemistry

, Volume 13, Issue 3, pp 395–400 | Cite as

Hysteresis effects with ZrO2 oxygen sensors exposed to non-equilibrium oxygen-hydrocarbon mixtures

  • J. E. Anderson
  • Y. B. Graves
Papers

Abstract

Hysteresis effects are reported for ZrO2 oxygen sensors exposed to non-equilibrium oxygen/hydrocarbon gas mixtures. With oxygen/toluene at 800° C, voltage-composition curves differ following composition changes (a) from excess oxygen to excess toluene and (b) from excess toluene to excess oxygen. A catalysis model is developed to account for this behaviour: the Thiele modulus of the catalyst/electrode is presumed to differ under (a) net oxidizing and (b) net reducing conditions. Large scale voltage fluctuations, sometimes exceeding 400 mV, were observed in experiments with oxygen/isobutane mixtures at 600° C. This behaviour is analysed in terms of a kinetic model involving stochastic variations of relative mass transfer coefficients of oxygen and isobutane.

Keywords

Mass Transfer Catalysis Transfer Coefficient Kinetic Model Mass Transfer Coefficient 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd. 1983

Authors and Affiliations

  • J. E. Anderson
    • 1
  • Y. B. Graves
    • 1
  1. 1.Research Ford Motor CompanyDearbornUSA

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