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Ionics

, Volume 5, Issue 1–2, pp 109–114 | Cite as

Physico-chemical investigations on selected gallium doped lanthanum chromites

  • F. Adolf
  • K. -P. Sandow
  • R. Hartung
  • S. Jakobs
  • H. Runge
  • A. Kruth
  • O. Schäf
  • U. Guth
Article
  • 41 Downloads

Abstract

Investigations on lanthanum gallium chromium mixed oxides of the compositions La1.0Ga0.2Cr0.8O3−d and La0.9Ga0.2Cr0.8O3-d are presented regarding their structure, redox stability, conductivity and catalytic activity for the oxidation of propene. The mixed oxide has perovskite-type structure, high redox stability, an electronic p-type conductivity and low catalytic activity. If the perovskite-type compound has a deficiency of lanthanum, the electronic conductivity, surface area and catalytic activity are significantly higher. The catalytic activity is likely comparable to that of gold. Similar to gold electrodes of solid electrolytes, oxygen electrodes formed with gallium doped lanthanum chromite show a relatively high sensitivity to hydrocarbons such as propene at temperatures of about 700 °C. The mixed oxide is possibly suitable as electrode material for exhaust gas sensors using oxide-ion conducting solid electrolytes.

Keywords

Catalytic Activity Gallium Lanthanum Chromite Mixed Oxide 
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

© IfI - Institute for Ionics 1999

Authors and Affiliations

  • F. Adolf
    • 1
    • 2
  • K. -P. Sandow
    • 1
  • R. Hartung
    • 1
  • S. Jakobs
    • 1
  • H. Runge
    • 2
  • A. Kruth
    • 3
  • O. Schäf
    • 1
    • 2
  • U. Guth
    • 1
    • 2
  1. 1.Dept. of Physical ChemistryErnst-Moritz-Arndt-UniversityGreifswaldGermany
  2. 2.Sensor Research CenterGreifswaldGermany
  3. 3.University of AberdeenScotland

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