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Mechanism and Kinetics of Solid State Reaction in the System CuCr2O4 — Cu2Cr2O4 — CuO

  • J. Haber
  • H. Piekarska-Sadowska

Abstract

The solid state reaction CuCr2O4 + CuO = Cu2Cr2O4 + 1/2 O2 was studied in the temperature range 820–850°C. Electron microprobe analysis showed that reaction consists of decomposition of CuCr2O4 grains to Cu2Cr2O4 transport of chromium in the form of CrO3 throug the gas phase to the surface of CuO grains and growth of Cu2Cr2 O4 by diffusion across the product layer. In the first stage the determining step is removal of chromium oxide from CuCr2O4 grains, the rate being well described by kt = 1 - (1-a) 1/3, in the second stage the rate becomes diffusion controlled and may be described by the Kröger-Ziegler equation k.In t = {1 - (1-a) 1/3}2.

Keywords

Solid State Reaction Electron Microprobe Electron Microprobe Analysis Transport Reaction Product Layer 
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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References

  1. 1.
    J. Deren, J. Haber, Z. anorg.allg.Chem., 342, 268 (1966)Google Scholar
  2. 2.
    J. Haber in “Festkörperchemie”, Verlag für Grundstoffindustrie, Leipzig 1973, p. 221Google Scholar
  3. 2.
    J. Haber, J. Ziolkowski, Proc. VII Int. Symp. Reactivity of Solids,Bristol 1972, Chapman and Hall,London 1972,p. 782.Google Scholar

Copyright information

© Springer Science+Business Media New York 1977

Authors and Affiliations

  • J. Haber
    • 1
  • H. Piekarska-Sadowska
    • 1
  1. 1.Research Laboratories of Catalysis and Surface ChemistryPolish Academy of SciencesKrakowPoland

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